WO1997004079A1

WO1997004079A1 - A modified enzyme with lipolytic activity

Info

Publication number: WO1997004079A1
Application number: PCT/DK1996/000322
Authority: WO
Inventors: Claus Crone Fuglsang; Jens Sigurd Okkels; Dorte Aaby Petersen; Shamkant Anant Patkar; Marianne Thellersen; Jesper Vind; Torben Halkier; Steen Troels JØRGENSEN
Original assignee: Novo Nordisk A/S
Priority date: 1995-07-14
Filing date: 1996-07-12
Publication date: 1997-02-06
Also published as: DE69633825D1; WO1997004078A1; JP4307549B2; ATE282087T1; JP2001526523A; AU6414196A; EP0839186B1; EP0839186A1; CN1193346A; DE69633825T2

Abstract

The invention relates to a modified enzyme with lipolytic activity recovered from a filamentous fungi or a bacteria having one or more peptide additions at the N-terminal and/or the C-terminal ends in comparison to the parent enzyme. Further, the invention relates to a DNA sequence encoding said modified enzyme, a vector comprising said DNA sequence, a host cell harbouring said DNA sequence or said vector, and a process for producing said modified enzyme with lipolytic activity.

Description

Title: A modified enzyme with lipolytic activity

FIELD OF THE INVENTION

The present invention relates to a modified enzyme with lipolytic activity, a DNA sequence encoding said modified enzyme, a vector comprising said DNA sequence, a host cell harbouring said DNA sequence or said vector, and a process for producing said modified enzyme with lipolytic activity.

Further the invention relates to a method for applying a peptide addition to a parent enzyme with lipolytic activity, a composition comprising the modified enzyme with lipolytic activity of the invention, the advantageous use of the modified enzyme of the invention in detergent compositions, and further a method for improving the washing performance of detergent compositions.

BACKGROUND OF THE INVENTION

Detergent enzymes have been marketed for more than 20 years and are today well established as normal detergent ingredients in both powder and liquid detergent all over the world.

Detergent compositions may comprise many different enzymes, of which proteases, amylases, cellulases, lipases, cutinases are the most important today.

Lipolytic enzymes

Lipolytic enzymes (i.e. enzymes classified under the Enzyme Classification number E.C. 3.1.1 (Carboxylic Ester Hydrolases) in accordance with the Recommendations (1992) of the International Union of Biochemistry and Molecular Biology (IUBMB)) are enzymes which can be used for removing lipid or fatty stains from clothes and other textiles.

Various microbial lipases have been suggested as detergent enzymes. Examples of such lipases include a Humicola lanuginosa lipase, e.g. described in EP 258 068 and EP 305 216, a Rhizomucor miehei lipase, e.g. as described in EP 238 023, Absidia sp. lipolytic enzymes (WO 96/13578), a Candida lipase, such as a C. amarctica lipase, e.g. the C. antarctica lipase A or B described in EP 214 761, a Pseudomonas lipase such as a P. alcaligenes and P. pseudoalcaligenes lipase, e.g. as described in EP 218 272, a P. cepacia lipase, e.g. as described in EP 331 376, a Pseudomonas sp. lipase as disclosed in WO95/ 14783, a Bacillus lipase, e.g. a B. subtilis lipase (Dartois et al., (1993) Biochemica et Biophysica acta 1131, 253-260), a B. stearothermophilus lipase (JP 64/744992) and a B. pumilus lipase (WO 91/16422). Furthermore, a number of cloned lipases have been described, including the Penicillium camembertii lipase described by Yamaguchi et al., (1991), Gene 103, 61-67), the Geotricum candidum lipase (Schimada, Y. et al., (1989), J. Biochem., 106, 383-388), and various Rhizopus lipases such as a R. delemar lipase (Hass, M.J et al., (1991), Gene 109, 117-113) a R. niveus lipase (Kugimiya et al., (1992), Biosci. Biotech. Biochem. 56, 716-719) and a R. oryzae lipase.

Other types of lipolytic enzymes having been suggested as detergent enzymes include cutinases, e.g. derived from Pseudomonas mendocina as described in WO 88/09367, or a cutinase derived from Fusariwn solanipisi (e.g. described in WO 90/09446).

In recent years attempts have been made to prepare modified lipolytic enzymes, such as variants and mutants having improved properties for detergent purposes.

In most cases lipolytic enzymes with improved washing performance have been constructed by site-directed mutagenesis resulting in substitution of specific amino acid residues which have been chosen either on the basis of their type or on the basis of their location in the secondary or tertiary structure of the mature enzyme.

.An alternative general approach for modifying proteins and enzymes have been based on random mutagenesis, for instance, as disclosed in US 4,894,331, WO 93/01285, and WO 95/22615. Comments to prior art

It is known from prior art to modify lipolytic enzymes by site-directed mutagenesis to obtain an improved performance, inparticular washing performance of lipolytic enzymes. The generally used concept has been to insert, delete or substitute amino acids within the structural part of the amino acid chain of the parent lipolytic enzyme in question. Lipolytic enzymes with a significantly improved washing performance have been achieved this way.

However, there is a need for providing lipolytic enzymes with an even further improved performance, such as washing performance and/or even further improved dishwashing properties than the lipolytic enzymes prepared by these prior art methods. SUMMARY OF THE INVENTION

Thus, the object of the present invention is to improve properties of enzymes with lipolytic activity, in particular to improve the washing performance of such enzymes.

It has surprisingly been found that it is possible to significantly enhance the washing performance of a lipolytic enzyme by applying a peptide addition to the N- and/or C-terminal of the enzyme.

Consequently, in a first aspect the invention relates to a modified enzyme with lipolytic activity which as compared to its parent enzyme has one or more peptide additions in its C-terminal and/or N-terminal end.

In the present context the term "peptide addition" is intended to indicate that a stretch of one or more consecutive amino acid residues has been added to either or both of the N- and/or C-terminal end(s) of the parent enzyme or inserted within the non-structural part of the N- and/or C-terminal end(s) of the parent enzyme.

The term "non-strucural part" is intended to indicate the part of the N- and C-terminal end, respectively, which is outside the first or last, respectively, structural element, such as an α-helix or β-sheet structure, of the folded mature enzyme. The non-structural part may easily be identified in a three-dimensional structure or model of the enzyme in question. Typically, the non-structural part comprises the first or the last about 1-20 amino acid residues of the amino acid sequence constituting the enzyme.

The term "mature enzyme" is used in its conventional meaning, i.e. to indicate the active form of the enzyme resulting after expression and posttranslational processing (to remove pro and/or pre-sequences) by the producer organism in question. When the enzyme is a secreted enzyme, the mature enzyme will normally be the form of the enzyme resulting after secretion. More specifically this means that the pre- and pro-peptide sequences, if present, have been removed from the initially translated enzyme, i.e. the unprocessed enzyme.

The term "parent" enzyme in intended to indicate the enzyme to be modified according to the invention. The parent enzyme may be a naturally-occuring (or wild type) enzyme or may be a variant thereof prepared by any suitable means. For instance, the parent enzyme may be a variant of a naturally-occurring enzyme which has been modified by substitution, deletion or truncation of one or more amino acid residues or by addition or insertion of one or more amino acid residues to the amino acid sequence of a naturally-occurring enzyme, typically in the structural part of the enzyme.

In other aspects the invention relates to a DNA sequence encoding a modified lipolytic enzyme as defined above, a recombinant vector or transformation vehicle comprising a DNA sequence of the invention, a host cell harbouring a DNA sequence of the invention or a vector of the invention, and a process for preparing a modified lipolytic enzyme by cultivation of said host cell. The modified lipolytic enzyme of the invention may conveniently be used as a detergent enzyme and accordingly, in final aspects the invention relates to a detergent additive or a detergent composition comprising a modified lipolytic enzyme of the invention. BRIEF DESCRIPTION OF THE DRAWING

Figure 1 shows the nucleotide and amino acid sequence of the coding region of the Hwnicola lanuginosa lipase gene as present in the yeast expression vector pJSO37. The signal sequence (amino acids 1 to 17) is the original signal sequence from Hwnicola lanuginosa. The SPIRR peptide addition is located at amino acid residue 18 to 22. Amino acid residue 23 (E) is the first amino acid residue of the parent lipase expressed in Aspergillus oryzae.

Figure 2 shows the nucleotide and amino acid sequence of the coding region of the Hwnicola lanuginosa lipase gene as present in the E. coli expression vector pJSO215. The signal sequence (amino acids 1 to 20) is the A. lyticus protease I signal (WO 96/17943). The SPIRR peptide is added after amino acid residue 20. Amino acid residue 26 (E) is the first amino acid residue of the parent lipase expressed in Aspergillus oryzae.

Figure 3 shows the nucleotide and amino acid sequence of the coding region of the Hwnicola lanuginosa lipase gene as present in the E. coli expression vector pSX581. The signal sequence (amino acids 1 to 20) is the A. lyticus protease I signal sequence (WO 96/17943). Amino acid residue 21 (E) is the first amino acid residue of the parent lipase.

Figure 4 the construction of pSX164;

Figure 5 the construction of pSX578;

Figure 6 the construction of pSX581;

Figure 7 shows the plasmid pSX581;

Figure 8 shows the plasmid pJSO37;

Figure 9 shows the construction of Aspergillus vector pCaHj485

DETAILED DESCRIPTION OF THE INVENTION

Peptide addition

As stated above it has surprisingly been found that a significantly improved wash performance of lipolytic enzymes may be achieved when an appropriate peptide addition is applied to a non-structural part of the enzyme in its mature form or at the C-terminal and/or N-terminal end of the mature enzyme. The term "improved wash performance" is intended to indicate that the modified enzyme of the invention has a better lipid soil removing capability than the unmodified parent enzyme when tested under wash like conditions. The improvement is often indicated in terms of "an improvement factor" (f_improve) (further reference vide the Materials and Methods section further below). Dependent on the peptide addition and the mature enzyme an improvement factor (f_improve) ) in the range of 1-5 , or even up to 10 (such as in the range of 1-10) has been obtained. It is presently believed that even higher improvement factors such as up to 20, even up 30, or even up to 50, such as between 30 and 50, or even higher may be achieved in accordance with the present invention.

The term "an appropriate peptide addition" is used to indicate that the peptide addition to be used is one which is capable of effecting an improved wash performance. The "appropriateness" of the peptide addition may be checked by a comparative analysis of the wash performance of a modified enzyme to which the peptide addition has been applied and of the corresponding parent enzyme, respectively. The wash performance may, e.g., be determined by any suitable technique such as any of the wash performance assays described in the present application.

It is presently contemplated that the improved wash performance effected by the peptide addition is, at least in part, due to an increased affinity of the modified lipolytic enzyme towards its lipid substrate (although this may not be the only reason).

The present invention is not limited to improving the wash performance of a parent lipolytic enzyme. It is contemplated that also other properties of parent lipolytic enzymes may be improved in accordance with the present invention, i.e. by applying an appropriate peptide addition at or within a non-structural part of the C-terminal and/or N-terminal end of the parent enzyme. More specifically, it is contemplated that the activity of a parent lipolytic enzyme, e.g., in removing pitch in the paper and pulp industry, in degreasing hides in the leather industry, in acting as a catalyst in organic syntheses, etc., may be significantly improved by applying an appropriate peptide addition at or within the N-terminal or C- terminal end of a lipolytic enzyme, i.e. a peptide addition which is capable of exerting thedesired function. Also in these connections it is believed that the improved activity may be at least partly due to an improved affinity for the substrate in question.

As a consequence of the improved activity it may be possible to reduce the dosage of the enzyme required for a given purpose considerably, as compared to the dosage of needed dosage of the unmodified parent enzyme. In the context of the present invention the term "modified enzyme" is intended to indicate a derivative or a variant of a parent enzyme, which derivative or variant as compared to the parent enzyme comprises a peptide addition at the C-terminal and/or N-terminal end (fused to the first and/or last amino acid residue of the parent enzyme) and/or within the non-structural part of the C- and/or N-teminal end of the parent enzyme. Thus, for instance, the modified enzyme may comprise a peptide addition at either the N-terminal or the C-terminal end or both in the N- and the C-terminal ends of the parent lipolytic enzyme.

It is presently believed that the capability of the peptide addition of providing the desired effect (such as improved wash performance, improved performance in degreasing of hides, etc, depends on, e.g., the identity of the parent enzyme to be modified, the structure (including length) of the peptide addition, the impact of the peptide addition on the structure of the entire lipolytic enzyme, the nature or functionality of amino acid residues of the peptide addition, etc. A prerequisite for the peptide addition being capable of providing the desired effect is, of course, that the modified enzyme containing the peptide addition is expressible in a suitable host organism. The following general considerations may be of relevance for the design of a suitable peptide addition:

Length of peptide addition: It has been found that peptide additions containing varying numbers of amino acid residues are capable of providing the desired effect and thus, it is not possible to specify an exact number of amino acid residues to be present in the peptide addition to be used in accordance with the present invention. It is contemplated that the upper limit of the number of amino acid residues is determined, inter alia, on the impact of the peptide addition on the expression, the structure and/or the activity of the resulting modified enzyme. It is believed that the peptide addition may comprise a substantial number of amino acid residues, however, without all of these amino acid residues need to contributing to the desired effect (even if the peptide addition contains a substantial number of amino acid residues only a small number of these need to providing the desired function, this small number may be termed the functional part of the peptide addition). The main consideration in relation to the lower limit of the number of amino acid residues of the peptide addition will normally be that the number should be sufficient to provide the desired effect.

The peptide addition may thus comprise a single amino acid residue or an amino acid chain of from 2 and 500 amino acids, such as from 1 to 200, or from 2 to 100, preferably from 2 to 50, such as 3 to 50, even more preferably from 7-45 and still more preferably between 1 and 15, such as between 1 and 10 or 1 and 7, especially between 4 and 10, such as 4 and 7 amino acids.

Stability: The peptide addition should preferably be chosen so as to provide a modified lipolytic enzyme with an acceptable stability (e.g. structural stability and/or expression stability) or so as to not significantly reduce the structural stability of the parent enzyme. Although many peptide additions are not believed to confer any substantial structural instability to the resulting modified enzyme, it may in certain instances and with certain parent enzymes be relevant to choose a peptide addition which in itself can confer a structural stability to the modified lipolytic enzyme. For instance, a peptide addition which in itself forms a structural element, such as an α-helix or a β-sheet, may stabilize the resulting modified enzyme and thus be used in the context of the present invention. Peptide sequences capable of forming such structures are known in the art. Alternatively, an improved structural stability may be provided by introduction of cystein bridges in the modified lipolytic enzyme of the invention. For instance, a cystein bridge between the peptide addition and the mature part of the enzyme may be established if at least one of the amino acid residues of the peptide addition is a cystein residue which is located so as to be able to form a covalent binding to a cystein residue in the mature part of the enzyme. The positive effect of introducing a cystein bridge is illustrated in Example 19. If no suitable cystein is present in the mature enzyme, a cystein may be inserted at a suitable location of said parent enzyme, conveniently by replacing an amino acid of the parent enzyme, which is considered unimportant for the activity.

In addition, it may be desirable that at least one of the amino acid residues of the peptide addition is chosen so as to make the peptide addition less susceptibility to proteolytic degradation by proteolytic enzymes of the host cell used for expressing the modified lipolytic enzyme. For instance, the peptide addition may comprise at least one, and preferably at least two proline residues. Preferably, the peptide addition comprises 1-5, such as 1-4 or 1-3 or two or one proline residues. The proline residue(s) is(are) preferably placed at the proteolytic cleavage site or close thereto. Alternatively, the peptide addition may be one which provides a protease stable loop to the modified lipase, e.g. as described in EP 407 225 or WO 93/11254.

Nature of amino acid residues of the peptide addition: As stated above and without being limited to any theory, it is presently believed that the improved performance may at least partly be due to an increased affinity of the modified lipolytic enzyme toward the substrate provided by the peptide addition. In particular in relation to wash performance, it is believed that favourable electrostatic interactions may be obtained between the negatively charged lipid surface and positively charged and/or hydrophobic amino acid residues present in the modified enzyme. Accordingly, it is particularly preferred that the modified enzyme of the invention comprises a peptide addition with at least one positive charge, such as at least 2, 3, 4 or more positive charges or expressed differently, in which a substantial number of the amino acid residues of the peptide addition is positively charged and/or hydrophobic.

Analogously, and in order to reduce the negative charge in a non-structural end of the parent enzyme it is preferred to remove at least one such as two or more negatively charged amino acid residues from a non-structural N-terminal or C-terminal part of the parent enzyme of choice, in particular from the part of the parent lipase being constructed of the 1-5 first or last N-terminal or C-terminal amino acid residues, such as 1-4, or 1-3 or 1-2. The negatively charged amino acid residue may either be removed or replaced by a neutral, a positively charged or a hydrophobic amino acid residue. For instance, the negatively charged amino acid residue to be removed may be an E or D which may be replaced with either of the positively charged amino acid residues R, K or H, the neutral amino acid residues S, T, G or Q, or the hydrophobic amino acid residues A, I, W F or L. Similarly, a neutral amino acid residue of a non-structural N-terminal or C-terminal part of the parent enzyme may be replaced with a positively charged or hydrophobic amino acid residue as defined above.

Accordingly, the modified lipolytic enzyme of the invention in addition or as an alternative to a N-terminal and/or C-terminal extension may comprise a mutation in the non-structural C-terminal and/or N-terminal end of the parent enzyme, which mutation has involved deleting or replacing a negatively charged amino acid residue of said non-structural part with a positively charged or neutral amino acid residue or with a hydrophobic amino acid residue.

If a peptide addition is present in both the N- and the C-terminal of the parent enzyme, the peptide addition at or within each of the terminals may have the same or a different amino acid sequence.

Test of suitability of peptide addition: the effect of using a given peptide addition, e.g., designed on the basis of the above principles may be tested by constructing a modified lipolytic enzyme containing the peptide addition and testing the properties of the resulting enzyme for the desired enzyme application such as wash, pitch removal, degreasing of leather, etc either in a full scale test or in an assay which correlates well with the enzyme application in question.

The peptide addition can be generalised in the following way.

The first residue (counted from the outer residue) is named "a", the second is named "b", the third "c" etc. Thus, in case of an N-terminal addition the first amino acid residue is termed "a", in case of a C-terminal addition the last amino acid residue is termed "a".

In an important embodiment of the invention the peptide addition consists of from 1 to 7 amino acids. Such peptide addition, which can be applied to both the N- and/or C-terminal of the parent enzyme, can be referred to as:

a (one amino acid peptide addition)

a-b (two amino acids peptide addition)

a-b-c (three amino acids peptide addition)

a-b-c-d (four amino acids peptide addition)

a-b-c-d-e (five amino acids peptide addition)

a-b-c-d-e-f (six amino acids peptide addition)

a-b-c-d-e-f-g (seven amino acids peptide addition)

Each letter defines an amino acid residue. a, b, c, d, e, f and g may independently be any amino acid including Alanine (A), Valine (V),

Leucine (L), Isoleucine (I), Proline (P), Phenylalanine (F), Tryptophan (W), Methionine (M),

Glycine (G), Serine (S), Threonine (T), Cysteine (C), Tyrosine (Y), Asparagine (N),

Glutamine (Q), Aspartic acid (D), Glutamic acid (E), Lysine (K), Arginine (R), and Histidine (H).

In specific embodiments a, b, c, d, e, f, and g are independently one of the following amino acids:

In a preferred embodiment at least one such as one, two, three or four of a, b, c, d, e, f, or g is a positively charged amino acid, i.e. Arg (R) or Lys (K) or a hydrophobic amino acid, i.e. Leu, De, Val, Trp or Phe.

As stated further above, and dependent on the host cell of choice it is generally believed that it is important that the peptide addition comprises at least one proline residue in order to protect the modified lipolytic enzyme against proteolytic degradation during the processing of the enzyme by the host cell of choice. It may be desirable that the proline residue occupies position two (i.e. b) and/or three (i.e. c) of the peptide addition or a position close to the desired cleavage point (i.e. the point where processing by the host cell in question is believed to occur). Accordingly, in one embodiment b and optionally c of the peptide addition is Pro In another embodiment of the invention a-b is SP (Ser-Pro), A-P or Q-P. If the peptide addition contains more amino acid residues, e.g. between 4 and 7 amino acids the peptide addition has the general formula SPcd, SPcde, SPcdef, SPcdefg or APcd, APcde, APcdef, Apcdefg or QPcd, QPcde, QPcdef, QPcdefg. In each of these formulae c, d, e , f, and g may be any amino acid. However, preferred are the above mentioned group of amino acids.

In another embodiment a-b comprise at least one positive amino acids (i.e. Arg and Lys) or hydrophobic amino acid residue (i.e. Leu, De, Val, Trp and Phe).

Specifically, the peptide addition applied to the parent lipolytic enzyme may advantageously be one of the following amino acid residues or peptides:

Also contemplated according to the invention is additions comprising more than 7 amino acids, such as from 8 to 15 amino acids. Such peptides can be generalised as:

a-b-c-d-e-f-g-h (8 amino acid peptide)

a-b-c-d-e-f-g-h-i (9 amino acid peptide)

a-b-c-d-e-f-g-h-i-j (10 amino acid peptide)

a-b-c-d-e-f-g-h-i-j -k (11 amino acid peptide)

a-b-c-d-e-f-g-h-i-j-k-l (12 amino acid peptide)

a-b-c-d-e-f-g-h-i-j-k-l-m-(13 amino acid peptide)

a-b-c-d-e-f-g-h-i-j-k-l-m-n(14 amino acid peptide)

a-b-c-d-e-f-g-h-i-j-k-l-m-n-o (15 amino acid peptide). a to o may be any of the twenty amino acids mentioned above.

The a-g stretch may be as defined above in relation to a peptide addition comprising 1 to

7 amino acid residues.

h, i, j, k, l, m, n, o may as mentioned above be any amino acid, preferably any of the following amino acids: Arg, Lys, Ala, Val, Trp, Ile, Phe, Ser or Pro.

Specific examples of such additions are listed below:

In any of the above specified peptide additions (whether comprising 1 to 7 or 1 to 15 amino acid residues) in which the position "a" is a Ser, Ala, Arg, Lys or Pro, the Ser may be replaced with an Ala, Arg, Lys or Pro, the Ala with a Ser, Arg, Lys or Pro and the Arg, Lys or Pro with a Ala or Ser.

It is to be emphasised that the above peptide addition may be at either the N-terminal and/or the C-terminal. Examples of modified lipolytic enzymes with both a N- and a C-terminal peptide addition include all combinations of the peptide additions specifically mentioned above. Two specific examples of such are the N-terminal addition SPIRPRP together with the C-terminal addition RRP or RR.

If the peptide addition is inserted into the non-structural part of the parent enzyme, it may replace one or more of the amino acid residues of said non-structural part. For instance, the peptide addition may replace one or more amino acid residues occupying the first, e.g. 1-5, amino acid residues of the N-terminal end and/or the last, e.g. 1-5, amino acids of the enzyme (i.e. the 1-5 amino acid residues of the C-terminal end). For instance, the peptide addition may replace amino acid residue(s) 1 and/or 2 and/or 3 and/or 4, and/or 5, etc. from either end of the parent enzyme.

When the parent enzyme is H. lanuginosa lipase it has been of particular interest to combine any of the above peptide additions (applied in the N-terminal) with a deletion of the parent first (1E).

In accordance with the invention, it is also contemplated to apply, to the modified enzyme, one or more charged amino acids which permit effective purification of the modified enzyme. Techniques for doing this is well known by a person skilled in the art of molecular biology.

Methods of applying a peptide addition to a parent lipolytic enzyme

Although a modified enzyme of the invention may be obtained by adding (fusing or inserting) a synthetically produced peptide addition into the parent lipolytic enzyme in question, it is presently preferred that the modified enzyme of the invention is prepared by i) modifying the nucleotide, preferably DNA, sequence encoding the parent enzyme so as to encode the desired peptide addition applied to the N- and/or the C-terminal end(s) of the parent enzyme (e.g. by inserting a nucleic acid (preferably DNA) sequence encoding the peptide addition at the relevant location in the nucleic acid (preferably DNA) sequence encoding the parent enzyme), ii) expressing the resulting modified nucleic acid (preferably DNA) sequence in a suitable expression system, and iii) recovering the resulting modified enzyme.

In the present context, the term "applied to" is intended to indicate that the addition is fused to the N- and/or C-terminal end (e.g. to the first or last amino acid residue) of the mature enzyme or inserted into a non-structural part of the N-terminal and/or C-terminal end of the mature enzyme.

Many enzymes are expressed as "prepro-enzymes", i.e. as enzymes consisting of the mature enzyme, a secretory signal peptide (i.e. prepeptide) and a pro-peptide. The preproenzyme is processed intracellularly to be secreted into the fermentation medium, from which the mature enzyme can be isolated and/or purified. The peptide addition to the parent enzyme can be carried out by applying nucleic acid sequences encoding the desirable peptide additions upstream (for N-terminal peptide additions) and/or downstream (for C-terminal peptide additions) to the DNA sequence encoding the parent enzyme.

The insertion should be performed in such a way that the desired modified enzyme (i.e. having the desired peptide addition(s)) is expressed and secreted by the host cell after transcription, translation, and processing of the enzyme. The term "processing" means in this context removal of pre- and pro-peptides (except, of course, when the pro-peptide is identical to the desired peptide addition. This will be dealt with furtehr below).

Downstream sequences (encoding a C-terminal addition) can be inserted between the DNA sequence encoding the parent enzyme and the terminating codon. However, if the unprocessed DNA sequence comprises a pro-peptide encoding DNA sequence at the C-terminal end the insertion/addition of the DNA sequence encoding the peptide addition can also take place between the DNA sequences encoding the pro-peptide and the mature enzyme, respectively.

In most cases it is possible to extend the parent enzyme upstream by inserting a DNA sequence encoding the peptide addition between the DNA sequence encoding the pro-peptide or the prepeptide (if no prosequence is present) and the DNA sequence encoding the mature enzyme.

The insertion/addition of a DNA sequence encoding the peptide addition can be carried out by any standard techniques known by any skilled person in the field of molecular biology, cf., e.g. Sambrook et al., 1989). This include, e.g., the polymerase chain reaction (PCR) using specific primers, for instance described in US patent 4,683,202 or R.K. Saiki et al., (1988), Science, 239, 487-491. How to provide for the expression and secretion of adjacent DNA sequence(s) will be described below.

In connection with the present invention it has been found that some host cells may be less suited for the production of a desired modified enzyme, in that part or all of the peptide addition(s) may be cut off during the posttranslational or other processesing performed by the host cell. Accordingly, the term "suitable expression system" is intended to indicate an expression system (host cell and optionally expression vector) which allows for at least a portion of an intact desired modified enzyme to be produced, i.e. an expression system which does not, e.g. as part of the posttranslational or other processing by the host cell of choice, remove part or all of the peptide addition (and thereby produce the enzyme without the desired peptide addition). Typically, the expression system to be used is devoid of one or more proteolytic activities exerting the undesired posttranslational processing. The choice of expression system and thus host cell will depend on the lipolytic enzyme to be produced as wiD be discussed in detail further below.

While care must be exerted to select a proper expression system for producing a modified enzyme of the invention (in particular when a modified DNA sequence is used for the production), it has been found that a modified lipolytic enzyme according to the invention (having an improved wash performance) may be obtained by expressing a DNA sequence encoding the parent lipolytic enzyme in question in an expression system which is incapable of processing the translated polypeptide in the normal manner, and thereby results in the production of an enzyme which comprises a part of or the entire propeptide or a similar peptide sequence associated with the mature protein prior to its processing. In this case, the propeptide or similar peptide sequence constitutes the peptide addition. The pro-peptide or similar peptide sequence may be heterologous or homologous to the parent enzyme and can be present in both the N- and C-terminal of the parent enzyme. The production of a modified lipolytic enzyme according to the invention using this latter technique is described further below.

Accordingly, if a suitable stretch of amino acids is already encoded in the prepro form of the parent enzyme and this stretch of amino acids is cut off in the processing of the enzyme by a given expression system, the peptide addition can be applied by changing the expression host system to a system in which said processing of said stretch of amino acids does not occur. In such a case the secretory signal pre-peptide will be cut off during or after the secretion, resulting in a modified enzyme consisting of the parent enzyme comprising the pro-peptide or part thereof or a similar peptide sequence encoded by the corresponding DNA sequence, i.e. a lipolytic enzyme being extended at either its N-terminal or C-terminal end.

In other words, in a further aspect the invention relates to a method for increasing the wash performance or other activity of a parent enzyme, comprising the steps of:

a) introducing a DNA sequence encoding the parent lipolytic enzyme into an expression vector,

b) introducing said DNA sequence or expression vector into a host cell incapable or inefficientl in the processing of the expressed pro-enzyme to the mature enzyme,

c) cultivating said host cell under conditions suitable for production of the enzyme comprising a part of the entire pro(pre)-sequence, and

d) recovering and optionally purifying the resulting modified enzyme.

Yeast cells have been found of particular use for applying peptide additions (in the form of the propeptide or a part thereof) to parent fungal lipolytic enzymes, in particular the H. lanuginosa lipase enzyme.

In an alternative and highly preferred embodiment the peptide addition is designed and applied by means of random mutagenesis according to the following principle:

a) subjecting a DNA sequence encoding the parent lipolytic enzyme with a peptide addition to localized random mutagenesis in the peptide addition or in a non-structural part of the C- terminal or N-terminal end of the parent enzyme,

b) expressing the mutated DNA sequence obtained in step a) in a host cell, and

c) screening for host cells expressing a mutated lipolytic enzyme which has an improved performance as compared to the parent lipolytic enzyme.

By this approach a number of highly advantageous peptide additions have been created.

The localized random mutagenesis may be performed essentially as described in WO 95/22615. More specifically, the mutagenesis is performed under conditions in which only one or more of the above areas are subjected to mutagenesis. Especially for mutagenizing large peptide additions, it may be relevant to use PCR generated mutagenesis (e.g. as described by Deshler 1992 or Leung et al., 1989), in which one or more suitable oligonucleotide probes are used which flanks the area to be mutagenized. For mutagenesis of shorter peptide additions, it is more preferably perform the localized random mutagenesis by use of doped or spiked oligonucleotides. The doping or spiking is used, e.g., to avoid codons for unwanted amino acid residues or to increase the likelihood that a particular type of amino acid residue, such as a positively charged or hydrophobic amino acid residue, is introduced at a desired position.

Subsequent to the mutagenesis the mutated DNA is expressed by culturing a suitable host cell carrying the DNA sequence under conditions allowing expression to take place.The host cell used for this purpose may be one which has been transformed with the mutated DNA sequence, optionaly present on a vector, or one which carried the DNA sequence encoding the parent enzyme during the mutagenesis treatment. Examples of suitable host cells are given below, and is preferably a host cell which is capable of secreting the mutated enzyme (enabling an easy screening). Yeast cells, such as cells of S. cereviciae, have been found to be suitable host cells.

The screening criteria of step c) will have to be chosen in dependence of the desired properties of the modified lipolytic enzyme. If it is desirable to construct a modified lipolytic enzyme with an improved wash performance the screening is conveniently conducted for a reduced dependency to calcium and/or an improved tolerance towards a detergent or a detergent component. The detergent or detergent component may be any of the specific components mentioned further below in the Detergent Composition section. A preferred detergent component is a non-ionic or an anionic surfactant such as an alcohol ethoxylate or LAS, a preferred detergent is the detergent PCS described in the Materials and methods section below. Non-ionic surfactants are of particular interest for screening of H. lanuginosa type of lipases (e.g. fungal lipases) whereas an-ionic surfactants are of interest for screening of Pseudomonas type lipases.

The screening of step c) is coneveniently performed by use of a filter assay based on the following principle:

A microorganism capable of expressing the modified lipolytic enzyme of interest is incubated on a suitable medium and under suitable conditions for the enzyme to be secreted, the medium being provided with a double filter comprising a first protein-binding filter and on top of that a second filter exhibiting a low protein binding capability. The microorganism is located on the second filter. Subsequent to the incubation, the first filter comprising enzymes secreted from the microorganisms is separated from the second filter comprising the micro organisms. The first filter is subjected to screening for the desired enzymatic activity and the corresponding microbial colonies present on the second filter are identified.

The filter used for binding the enzymatic activity may be any protein binding filter e.g. nylon or nitrocellulose. The topfilter carrying the colonies of the expression organism may be any filter that has no or low affinity for binding proteins e.g. cellulose acetate or Durapore™.

The filter may be pretreated with any of the conditions to be used for screening or may be treated during the detection of enzymatic activity.

The enzymatic activity may be detected by a dye, flourescence, precipitation, pH indicator, IR-absorbance or any other known technique for detection of enzymatic activity.

The detecting compound may be immobilized by any immobilizing agent e.g. agarose, agar, gelatine, polyacrylamide, starch, filter paper, cloth; or any combination of immobilizing agents.

Lipase activity may be detected by Brilliant green, Rhodamine B or Sudan Black in combination with a lipid e.g. olive oil or lard. The screening criteria for identifying modified lipolytic enzymes having improved washing performance may be e.g. EGTA, EDTA, non- ionic or anionic tensides, alkaline pH, or any detergent composition in combination with one of the above detectors of enzymatic activity.

It wiD be understood that the screening criteria used in the filter assay of the invention may be chosen so as to comply with the desired properties or uses of the enzymes to be screened. For instance, in a screening for lipolytic enzymes of particular use in the paper and pulp industry, it may be relevant to screen for an acid enzyme having an increased temperature stability. This may be performed by using a buffer with acidic pH (e.g. pH 4) and/or incubate under higher temperature before or under the assay. For detergent enzymes screening is normally conducted at alkaline pH.

Alternatively, the screening may be performed by isolating the mutated lipolytic enzyme resulting from step b) and testing the wash performance (or any other relevant property) thereof. Also, the latter "in vivo" test may be used in addition to the screening assay so as to identify the best of the mutated lipolytic enzymes selected in the screening assay. Finally, amino acid sequencing of the resulting modified lipolytic enzyme may be used to confirm the amino acid sequence of the peptide addition.

Method of improving properties

It is also an object of the invention to improve properties, in particular to improve the wash performance, of the parent lipolytic enzymes mentioned above. The improved properties obtained by to the method of the invention is believed to be a result of an increased affinity towards the lipid substrate.

The method of the invention comprises applying a peptide addition to the N-terminus or C-terminus of the parent enzyme in its mature form. In an embodiment of the invention this is done by applying a peptide addition to the parent enzyme by cultivating a host cell comprising a DNA sequence encoding the pre, pro or prepro-form of the parent lipolytic enzyme. Optionally the DNA sequence is present on a vector. The recovering of the resulting modified lipolytic enzyme, the host cell, cultivation conditions and/or recovery conditions are selected so that at the most a partial processing of the pre, pro or prepro-form of the parent enzyme occur resulting in that at least 5%, such as at least 10%, such as at least 15%, such as at least 20% , such as at least 25%, such as at least 50% , such as at least 75% of the produced modified enzyme molecules comprise the desired peptide addition, e.g. the entire pro-sequence or a substantial part thereof.

The host cell may be of a different origin than the parent enzyme, e.g. of another genus than the one from which the parent enzyme is derived, or may have another posttranslational processing machinery than the source of the parent enzyme.

The parent lipolytic enzyme is preferably derived from a filamentous fungus, such as a strain of a Hwnicola sp. , in particular H. lanuginosa, or a bacterium, such as a strain of a Pseudomonas sp., and the host cell is a yeast celll, such as a strain of Saccharomyces sp., in particular Saccharomyces cerevisiae, or a strain of Hansenula sp..

In an embodiment of the invention the inherent proteolytic enzyme producing capability of the host cell used for applying the peptide addition to the parent lipolytic enzyme has been reduced, e.g. by abolishing the production of one or more proteolytic enzymes by the host cell.

The method of the invention comprises the steps of:

a) subjecting a DNA sequence encoding the parent lipolytic enzyme with a peptide addition, such as a DNA sequence of the invention, to localized random mutagenesis in the part of the DNA sequence encoding the peptide addition or a non-structural part of the C-terminal or N-terminal end of the parent enzyme,

b) expressing the mutated DNA sequence obtained in step a) in a host cell, and

c) screening for host cells expressing a mutated lipolytic enzyme which has an improved performance as compared to the parent lipolytic enzyme. In an embodiment the DNA sequence is the gene or cDNA sequence encoding the parent enzyme in its pro or prepro-form.

It is also contemplated to according to the invention to introduce a mutation in the non-structural part of the C-terminus or N-terminus of the parent enzyme in its mature form, e.g. by deleting or replacing a negatively charged amino acid residue of the non-structural part with a neutral or positively charged amino acid residue or with a hydrophobic amino acid residue, or replacing a neutral amino acid residue with a positively charged amino acid residue. Parent lipolytic enzyme

The modified lipolytic enzymes of the invention may be constructed from any parent lipolytic enzymes of microbial origin, preferably of bacterial or fungal (i.e. filamentous fungal or yeast) origin.

According to the invention the enzyme of the invention may be any lipolytic enzyme including lipases, phospholipases, esterases and cutinases (according to conventional terminology).

It is to be understood that lipolytic enzymes normally comprising pro- and/or pre-peptides in their unprocessed state as well as enzymes which do not are contemplated to serve as parent enzymes for the modification according to the invention.

Examples of relevant parent lipolytic enzymes include enzymes derived from the following microorganisms:

Humicola, e.g. H. brevispora, H. lanuginosa, H. brevis var. thermoidea and H. insolens

(US 4,810,414) or WO 96/13580;

Pseudomonas, e.g. Ps. fragi, Ps. stutzeri, Ps. cepacia and Ps. fluorescens (WO 89/04361), or Ps. plantarii or Ps. gladioli (US patent no. 4,950,417 (Solvay enzymes)) or Ps. alcάligenes and Ps. pseudoalcaligenes (EP 218 272 or WO 94/25578) or Ps. mendocina (WO 88/09367; US 5,389,536);

Fusariwn, e.g. F. oxysporwn (EP 130,064) or F. solanipisi (WO 90/09446);

Mucor (also called Rhizomucor), e.g. M. miehei (EP 238 023);

Absidia sp. (WO 96/13578);

Chromobacteriwn (especially C. viscoswri);

Aspergillus (especially A. niger);

Candida, e.g. C. cylindracea (also called C. rugosa) or C. antarctica (WO 88/02775) or C. antarctica lipase A or B (WO 94/01541 and WO 89/02916);

Geotricum, e.g. G. candidwn (Schimada et al., (1989), J.Biochem., 106, 383-388); Penicillium, e.g. P. camembertii (Yamaguchi et al., (1991), Gene 103, 61-67);

Rhizopus, e.g. R. delemar (Hass et al., (1991), Gene 109,107-113) or R. mveus (Kugimiya et al. , (1992) Biosci.Biotech. Biochem 56, 716-719) or R. oryzae; and Bacillus, e.g. B. subtilis (Dartois et al., (1993) Biochemica et Biophysica acta 1131, 253-260) or B. stearothermophilus (JP 64/7744992) or B. pwnilus (WO91/16422).

The generic name Thermomyces lanuginosus was introduced by Tsiklinsky in 1899 for one species, Thermomyces lanuginosus. The species is very characteristic

morphologically and physiologically and there is little doubt that Tsiklinsky's

Thermomyces lanuginosus is the same as isolated and described by later workers (such as for instance Bunce (1961) and Cooney & Emerson (1964) as Hwnicola lanuginosa.

According to The International Code of Botanical Nomenclature the correct name is the earliest legitimate one. Thus Thermomyces lanuginosus should be the correct name. However, due to Tsiklinsky's incomplete description of the species, this legitimacy has been questioned by many mycologists. Thus the main reason for the taxonomical » confusion relates to different views as to whether Tsiklinsky's description meets the requirements for a valid publication.

However, the name Hwnicola lanuginosa is still seen in literature, probably due to the popularity of the book of Cooney & Emerson (1964) "The Thermophilic Fungi", which recommends the use of the name Hwnicola lanuginosa.

Sequencing of the DNA encoding part of the 18S ribosomal gene from

Thermomyces lanuginosus have been performed. The 18S sequences was compared to other 18S sequences in the GenBank database and a phylogenetic analysis using parsimony (PAUP, Version3.1.1, Smithsonian Institution, 1993) have also been made. This clearly assigns Thermomyces lanuginosus to the class of Plectomycetes, probably to the order of Eurotiales. According to the Entrez Browser at the NCBI (National Center for Biotechnology Information), this relates Thermomyces lanuginosus to families like Eremascaceae, Monoascaceae, Pseudoeurotiaceae and Trichocomaceae, the latter containing genera like Emericella, Aspergillus, Penicillium, Eupenicillium, Paecilomyces, Talaromyces, Thermoascus and Sclerocleista.

In connection with the present invention the name Hwnicola lanuginosa will be used.

In connection with the Pseudomonas sp. lipases it has been found that lipases from the following organisms have a high degree of homology and thus are contemplated to belong to the same family of lipases: Ps. ATCC21808, Ps. aeruginosa EF2, Ps. aeruginosa PAC1R, Ps. aeruginosa PAO1, Ps. aeruginosa TE3285, Ps. sp. 109, Ps. pseudoalcaligenes Ml, Ps. glumae, Ps. cepacia DSM3959, Ps. cepacia M-12-33, Ps. sp. KWI-56, Ps. putida IFO3458, Ps. putida IFO12049 (Gilbert, E. J., (1993), Pseudomonas lipases: Biochemical properties and molecular cloning. Enzyme Microb. Technol., 15, 634-645).

Specific examples of readily available commercial lipases which may be modified according to the invention include Lipolase® and Lipolase®Ultra (available from Novo Nordisk A/S).

Examples of other lipolytic enzymes specifically contemplated according to the invention are Lumafast® (a Ps. mendocina lipase from Genencor Int. Inc); Lipomax^® (a Ps. pseudoalcaligenes lipase from Genencor Int. Inc.); a Fusarium solani lipase (cutinase) from

Unilever; a Bacillus sp. lipase from Solvay enzymes; and Liposam^®, (a Ps. mendocina lipase from Showa Denko) and further the Peudomonas sp. lipase described in WO 95/06720 which have been sequenced and found to have the amino acid sequence shown in SEQ ID NO. 93.

It is to be emphasized that the parent lipolytic enzyme from which the modified ehzyme of the invention can be constructed includes the above mentioned lipolytic enzymes and any variant, modification, and truncation thereof.

Examples of such parent enzymes which are specifically contemplated include the enzymes described in WO92/05249, WO 94/01541, WO 94/14951, WO 94/25577, WO 95/22615 and a protein engineered lipase variants as described in EP 407 225; a protein engineered Ps. mendocina lipase as described in US 5,352,594; a cutinase variant as described in WO 94/14964; a variant of an Aspergillus lipolytic enzyme as described in EP patent 167,309; and Peudomonas sp. lipase described in WO 95/06720.

In the most preferred embodiment the parent enzyme is derived from a strain of a Hwnicola sp. or or from a strain of a Pseudomonas sp. or a genus considered to belong to the Pseudomonas family.

In a specific embodiment of the invention the DNA sequence encoding the parent enzyme with lipolytic activity (to be processed into a modified enzyme of the invention) is the DNA sequence encoding the enzyme with lipolytic activity derived from the filamentous fungi Hwnicola lanuginosa described in EP 305 216. The amino acid sequence of the parent enzyme is in this case that of the secreted mature enzyme.

It is presently contemplated that the washing performance and/or thermostability of the modified enzyme of the invention may be further improved if the enzyme is glycosylated. Accordingly, in an embodiment of the invention the modified enzyme may be glycosylated. The amino acid sequence may have any degree of glycosylation.

DNA sequence of the invention

In another aspect the invention relates to a DNA sequence encoding said modified enzyme with lipolytic activity of the invention.

The DNA sequence encoding a modified enzyme of the invention is normally prepared by modification of the DNA sequence encoding the parent lipolytic enzyme in question by any suitable method known in the art(e.g. by use of PCR as mentioned above), but may also be prepared synthetically by established standard methods, e.g. the phosphoamidite method described by Beaucage and Caruthers, (1981), Tetrahedron Letters 22, 1859 - 1869, or the method described by Matthes et al., (1984), EMBO Journal 3, 801-805. According to the phosphoamidite method, oligonucleotides are synthesized, e.g. in an automatic DNA synthesizer, purified, annealed, ligated and cloned in suitable vectors.

A DNA sequence encoding the parent lipolytic enzyme of choice may be obtained by use of conventional techniques. For instance, the DNA sequence may be isolated from a genomic or DNA library prepared from the relevant organism or may be obtained by expression cloning, e.g. as described in WO 93/11249, or may be produced synthetically.

In a currently preferred embodiment, the DNA sequence encoding the modified lipolytic enzyme of the invention is prepared from the DNA sequence encoding a lipolytic enzyme derived from Hwnicola lanuginosa and described in EP 305 216. In another preferred embodiment the DNA sequence is derived from a strain of Pseudomonas sp. , especially a strain of Ps. alcaligenes or Ps. pseudoalcaligenes.

An isolated nucleic acid sequence encoding a modified lipolytic enzyme of the invention may be manipulated in a variety of ways to provide for expression of the enzyme. Manipulation of the nucleic acid sequence encoding a modified lipolytic enzyme prior to its insertion into a vector may be desirable or necessary depending on the expression vector. The techniques for modifying nucleic acid sequences utilizing cloning methods are well known in the art.

The term "control sequences" is defined herein to include all components which are necessary or advantageous for expression of the coding sequence of the nucleic acid sequence. Each control sequence may be native or foreign to the nucleic acid sequence encoding the modified lipolytic enzyme. Such control sequences include, but are not limited to, a leader, a polyadenylation sequence, a propeptide sequence, a promoter, a signal sequence, and a transcription terminator. At a minimum, the control sequences include a promoter, and transcriptional and translational stop signals. The control sequences may be provided with linkers for the purpose of introducing specific restriction sites facilitating ligation of the control sequences with the coding region of the nucleic acid sequence encoding a modified lipolytic enzyme.

The control sequence may be an appropriate promoter sequence, a nucleic acid sequence which is recognized by a host cell for expression of the nucleic acid sequence. The promoter sequence contains transcription and translation control sequences which mediate the expression of the modified lipolytic enzyme. The promoter may be any nucleic acid sequence which shows transcriptional activity in the host cell of choice and may be obtained from genes encoding extracellular or intracellular polypeptides either homologous or heterologous to the host cell. Examples of suitable promoters for directing the transcription of the nucleic acid constructs of the present invention, especially in a bacterial host cell, are the promoters obtained from the E. coli lac operon, the Streptomyces coelicolor agarase gene (dagA), the B. subtilis levansucrase gene (sacB) or the alkaline protease gene, the B. licheniformis alpha-amylase gene (amyL), the B. stearothermophilus maltogenic amylase gene (amyM), the B. amyloliquefaciens alpha-amylase gene (amyQ), the B. licheniformis penicillinase gene (penP), the B. subtilis xylA and xylB genes, the B. pumilus xylosidase gene, and the prokaryotic beta-lactamase or tryptophan gene (Villa-Kamaroflf et al., 1978, Proceedings of the National Academy of Sciences USA 75:3727-3731), as well as the tac gene (DeBoer et al., 1983, Proceedings of the National Academy of Sciences USA 80:21-25). Further promoters are described in "Useful proteins from recombinant bacteria" in Scientific American, 1980, 242:74-94; and in Sambrook et al., 1989, supra. Examples of suitable promoters for directing the transcription of the nucleic acid constructs of the present invention in a filamentous fungal host cell are promoters obtained from the genes encoding A. oryzae TAKA amylase, A. oryzae triose phosphate isomerase, Rhizomucor miehei aspartic proteinase, A. niger neutral alpha-amylase, A. niger acid stable alpha-amylase, A. niger or A..awamori glucoamylase (glaA), Rhizomucor miehei lipase, A. oryzae alkaline protease, A. oryzae triose phosphate isomerase, A. nidulans acetamidase, Fusarium oxysporum trypsin-like protease (as described in U.S. Patent No. 4,288,627, which is incorporated herein by reference), or the ADH-3 promoter (McKnight et al., (1985), The EMBO J. 4, 2093-3099) and hybrids thereof. Particularly preferred promoters for use in filamentous fungal host cells is the TAKA amylase and the glaA promoters. In a yeast host, promoters from yeast glycolytic genes (Hitzeman et al.,(1980), J. Biol. Chem. 255, 12073-12080; Alber and Kawasaki, (1982), J. Mol. Appl. Gen. 1, 419-434) or alcohol dehydrogenase genes (Young et al., in Genetic Engineering of Microorganisms for Chemicals (Hollaender et al, eds.), Plenum Press, New York, 1982), or the TPI1 (US 4,599,311) or ADH2-4c (Russell et al., (1983), Nature 304, 652-654) promoters, useful promoters are obtained from the S. cerevisiae enolase (ENO-1) gene, the S. cerevisiae galactokinase gene (GAL1), the S. cerevisiae alcohol dehydrogenase/glyceraldehyde-3-phosphate dehydrogenase genes (ADH2/GAP), and the S. cerevisiae 3-phosphoglycerate kinase gene. Other useful promoters for yeast host cells are described by Romanos et al., 1992, Yeast 8:423-488.

The control sequence may also be a suitable transcription terminator sequence, a sequence recognized by a host cell to terminate transcription. The terminator sequence is operably linked to the 3' terminus of the nucleic acid sequence encoding the modified lipolytic enzyme. The terminator sequence may be native to the nucleic acid sequence encoding the modified lipolytic enzyme or may be obtained from foreign sources. Any terminator which is functional in the host cell of choice may be used in the present invention. Preferred terminators for filamentous flingal host cells are obtained from the genes encoding A. oryzae TAKA artiylase, A. niger glucoamylase, A. nidulans anthranilate synthase, A. niger alpha-glucosidase, and Fusarium oxysporum trypsin-like protease. Preferred terminators for yeast host cells are obtained from the genes encoding S. cerevisiae enolase, S. cerevisiae cytochrome C (CYC1), or S. cerevisiae glyceraldehyde-3 -phosphate dehydrogenase. Other useful terminators for yeast host cells are described by Romanos et al., 1992, supra

The control sequence may also be a suitable leader sequence, a nontranslated region of a mRNA which is important for translation by the host cell. The leader sequence is operably linked to the 5' terminus of the nucleic acid sequence encoding the modified lipolytic enzyme. The leader sequence may be native to the nucleic acid sequence encoding the modified lipolytic enzyme or may be obtained from foreign sources. Any leader sequence which is functional in the host cell of choice may be used in the present invention. Preferred leaders for filamentous fungal host cells are obtained from the genes encoding A. oryzae TAKA amylase and A. oryzae triose phosphate isomerase. Suitable leaders for yeast host cells are obtained from the S. cerevisiae enolase (ENO-1) gene, the S. cerevisiae 3-phosphoglycerate kinase gene, the S. cerevisiae alpha- factor, and the S. cerevisiae alcohol dehydrogenase/glyceraldehyde-3-phosphate dehydrogenase genes (ADH2/GAP).

The control sequence may also be a polyadenylation sequence, a sequence which is operably linked to the 3' terminus of the nucleic acid sequence and which, when transcribed, is recognized by the host cell as a signal to add polyadenosine residues to transcribed mRNA The polyadenylation sequence may be native to the nucleic acid sequence encoding the modified lipolytic enzyme or may be obtained from foreign sources. Any polyadenylation sequence which is functional in the host cell of choice may be used in the present invention. Preferred polyadenylation sequences for filamentous fungal host cells are obtained from the genes encoding A. oryzae TAKA amylase, A. niger glucoamylase, A. nidulans anthranilate synthase, and A. niger alpha-glucosidase. Useful polyadenylation sequences for yeast host cells are described by Guo and Sherman, 1995, Molecular Cellular Biology 15:5983-5990. Polyadenylation sequences are well known in the art for mammalian host cells.

The control sequence may also be a signal peptide coding region, which codes for an amino acid sequence linked to the amino terminus of the modified lipolytic enzyme which can direct the expressed modified lipolytic enzyme into the cell's secretory pathway. The signal peptide coding region may be native to the modified lipolytic enzyme of the invention or may be obtained from foreign sources. The 5' end of the coding sequence of the nucleic acid sequence may inherently contain a signal peptide coding region naturally linked in translation reading frame with the segment of the coding region which encodes the secreted modified lipolytic enzyme. Alternatively, the 5' end of the coding sequence may contain a signal peptide coding region which is foreign to that portion of the coding sequence which encodes the secreted modified lipolytic enzyme. The foreign signal peptide coding region may be required where the coding sequence does not normally contain a signal peptide coding region. Alternatively, the foreign signal peptide coding region may simply replace the natural signal peptide coding region in order to obtain enhanced secretion of the enzyme relative to the natural signal peptide coding region normally associated with the coding sequence. The signal peptide coding region may be obtained from a glucoamylase or an amylase gene from an Aspergillus species, a lipase or proteinase gene from a Rhizomucor species, the gene for the α-factor from Saccharomyces cerevisiae, an amylase or a protease gene from a Bacillus species, or the calf preprochymosin gene. An effective signal peptide coding region for bacterial host cells is the signal peptide coding region obtained from the maltogenic amylase gene from Bacillus NCEB 11837, the B. stearothermophilus alpha-amylase gene, the B. licheniformis subtilisin gene, the B. licheniformis beta-lactamase gene, the B. stearothermophilus neutral proteases genes (nprT, nprS, nprM), and the B. subtilis PrsA gene. Further signal peptides are described by Simonen and Palva, 1993, Microbiological Reviews 57:109-137. An effective signal peptide coding region for filamentous fungal host cells is the signal peptide coding region obtained from A. oryzae TAKA amylase gene, A. niger neutral amylase gene, the Rhizomucor miehei aspartic proteinase gene, the H. lanuginosa cellulase gene, or the Rhizomucor miehei lipase gene. Useful signal peptides for yeast host cells are obtained from the genes for S. cerevisiae α-factor and S. cerevisiae invertase. Other useful signal peptide coding regions are described by Romanos et al., 1992, supra. However, any signal peptide coding region capable of directing the expressed enzyme into the secretory pathway of a host cell of choice may be used in the present invention.

The nucleic acid constructs of the present invention may also comprise one or more nucleic acid sequences which encode one or more factors that are advantageous in the expression of the modified lipolytic enzyme, e.g., an activator (e.g., a trans-acting factor), a chaperone, and a processing protease. The nucleic acids encoding one or more of these factors are not necessarily in tandem with the nucleic acid sequence encoding the modified lipolytic enzyme. An activator is a protein which activates transcription of a nucleic acid sequence encoding a modified lipolytic enzyme (Kudla et al., 1990, EMBO Journal 9:1355-1364; Jarai and Buxton, 1994, Current Genetics 26:2238-244; Verdier, 1990, Yeast 6:271-297). The nucleic acid sequence encoding an activator may be obtained from the genes encoding B. stearothermophilus NprA (nptA), S. cerevisiae heme activator protein 1 (hap1), S. cerevisiae galactose metabolizing protein 4 (gal4), and A. nidulans ammonia regulation protein (areA). For further examples, see Verdier, 1990, supra and MacKenzie et al., 1993, Journal of General Microbiology 139:2295-2307. A chaperone is a protein which assists another polypeptide in folding properly (Hart1 et al., 1994, ΗBS 19:20-25; Bergeron et al., 1994, ΗBS 19:124-128; Demolder et al., 1994, Journal of Biotechnology 32:179-189; Craig, 1993, Science 260:1902-1903; Gething and Sambrook, 1992, Nature 355:33-45; Puig and Gilbert, 1994, Journal of Biological Chemistry 269:7764-7771; Wang and Tsou, 1993, The FASEB Journal 7:1515-11157; Robinson et al., 1994, Bio/Technology 1:381-384). The nucleic acid sequence encoding a chaperone may be obtained from the genes encoding B. subtilis GroE proteins, A. oryzae protein disulphide isomerase, S. cerevisiae calnexin, S. cerevisiae BLP/GRP78, and S. cerevisiae Hsp70. For further examples, see Gething and Sambrook, 1992, supra, and Haiti et al., 1994, supra. Any factor that is functional in the host cell of choice may be used in the present invention.

It may also be desirable to add regulatory sequences which allow the regulation of the expression of the modified lipolytic enzyme relative to the growth of the host cell. Examples of regulatory systems are those which cause the expression of the gene to be turned on or off in response to a chemical or physical stimulus, including the presence of a regulatory compound. Regulatory systems in prokaryotic systems would include the lac, tac, and trp operator systems. In yeast, the ADH2 system or GAL1 system may be used. In filamentous fungi, the TAKA alpha-amylase promoter, A. niger glucoamylase promoter, and the A. oryzae glucoamylase promoter may be used as regulatory sequences. Other examples of regulatory sequences are those which allow for gene amplification. In eukaryotic systems, these include the dihydrofolate reductase gene which is amplified in the presence of methotrexate, and the metallothionein genes which are amplified with heavy metals. In these cases, the nucleic acid sequence encoding the modified lipolytic enzyme would be placed in tandem with the regulatory sequence.

Expression Vectors

The present invention also relates to recombinant expression vectors comprising a nucleic acid sequence of the present invention, a promoter, and transcriptional and translational stop signals. The various nucleic acid and control sequences described above may be joined together to produce a recombinant expression vector which may include one or more convenient restriction sites to allow for insertion or substitution of the nucleic acid sequence encoding the modified lipolytic enzyme at such sites. Alternatively, the nucleic acid sequence of the present invention may be expressed by inserting the nucleic acid sequence or a nucleic acid construct comprising the sequence into an appropriate vector for expression. In creating the expression vector, the coding sequence is located in the vector so that the coding sequence is operably linked with the appropriate control sequences for expression, and possibly secretion.

The recombinant expression vector may be any vector which can be conveniently subjected to recombinant DNA procedures and can bring about the expression of the nucleic acid sequence. The choice of the vector will typically depend on the compatibility of the vector with the host cell into which the vector is to be introduced. The vectors may be linear or closed circular plasmids. The vector may be an autonomously replicating vector, i.e., a vector which exists as an extrachromosomal entity, the replication of which is independent of chromosomal replication, e.g., a plasmid, an extrachromosomal element, a minichromosome, or an artificial chromosome. The vector may contain any means for assuring self-replication. Alternatively, the vector may be one which, when introduced into the host cell, is integrated into the genome and replicated together with the chromosomes) into which it has been integrated. The vector system may be a single vector or plasmid or two or more vectors or plasmids which together contain the total DNA to be introduced into the genome of the host cell, or a transposon.

The vectors of the present invention preferably contain one or more selectable markers which permit easy selection of transformed cells. A selectable marker is a gene the product of which provides for biocide or viral resistance, resistance to heavy metals, prototrophy to auxotrophs, and the like. Examples of bacterial selectable markers are the dal genes from B. subtilis or B. licheniformis, or markers which confer antibiotic resistance such as ampicillin, kanamycin, chloramphenicol or tetracycline resistance. A frequently used mammalian marker is the dihydrofolate reductase gene. Suitable markers for yeast host cells are ADE2, HIS3, LEU2, LYS2, MET3, TRPl, and URA3. A selectable marker for use in a filamentous fungal host cell may be selected from the group including, but not limited to, amdS (acetamidase), argB (ornithine carbamoyltransferase), bar (phosphinothricin acetyltransferase), hygB (hygromycin phosphotransferase), niaD (nitrate reductase), pyrG (orotidine-5'-phosphate decarboxylase), sC (sulfate adenyltransferase), trpC (anthranilate synthase), and glufosinate resistance markers, as well as equivalents from other species. Preferred for use in an Aspergillus cell are the amdS and pyrG markers of A. nidulans or A. oryzae and the bar marker of Streptomyces hygroscopicus. Furthermore, selection may be accomplished by co-transformation, e.g., as described in WO 91/17243, where the selectable marker is on a separate vector.

The vectors of the present invention preferably contain an element(s) that permit* stable integration of the vector into the host cell genome or autonomous replication of the vector in the cell independent of the genome of the cell.

The vectors of the present invention may be integrated into the host cell genome when introduced into a host cell. For integration, the vector may rely on the nucleic acid sequence encoding the modified lipolytic enzyme or any other element of the vector for stable integration of the vector into the genome by homologous or nonhomologous recombination. Alternatively, the vector may contain additional nucleic acid sequences for directing integration by homologous recombination into the genome of the host cell. The additional nucleic acid sequences enable the vector to be integrated into the host cell genome at a precise location(s) in the chromosomes). To increase the likelihood of integration at a precise location, the integrational elements should preferably contain a sufficient number of nucleic acids, such as 100 to 1,500 base pairs, preferably 400 to 1,500 base pairs, and most preferably 800 to 1,500 base pairs, which are highly homologous with the corresponding target sequence to enhance the probability of homologous recombination. The integrational elements may be any sequence that is homologous with the target sequence in the genome of the host cell. Furthermore, the integrational elements may be non-encoding or encoding nucleic acid sequences. On the other hand, the vector may be integrated into the genome of the host cell by non-homologous recombination. These nucleic acid sequences may be any sequence that is homologous with a target sequence in the genome of the host cell, and, furthermore, may be non-encoding or encoding sequences.

For autonomous replication, the vector may further comprise an origin of replication enabling the vector to replicate autonomously in the host cell in question. Examples of bacterial origins of replication are the origins of replication of plasmids pBR322, pUC19, pACYC177, pACYC184, pUB110, pE194, pTA1060, and pAMß1. Examples of origin of replications for use in a yeast host cell are the 2 micron origin of replication, the combination of CEN6 and ARS4, and the combination of CEN3 and ARS1. The origin of replication may be one having a mutation which makes its functioning temperature-sensitive in the host cell (see, e.g., Ehrlich, 1978, Proceedings of the National Academy of Sciences USA 75: 1433).

More than one copy of a nucleic acid sequence encoding a modified lipolytic enzyme of the present invention may be inserted into the host cell to amplify expression of the nucleic acid sequence. Stable amplification of the nucleic acid sequence can be obtained by integrating at least one additional copy of the sequence into the host cell genome using methods well known in the art and selecting for transformants.

The procedures used to ligate the elements described above to construct the recombinant expression vectors of the present invention are well known to one skilled in the art (see, e.g., Sambrook etal., 1989, supra).

Host Cells

The present invention also relates to recombinant host cells, comprising a nucleic acid sequence of the invention, which are advantageously used in the recombinant production of the modified lipolytic enzymes. The cell is preferably transformed with a vector comprising a nucleic acid sequence of the invention followed by integration of the vector into the host chromosome. "Transformation" means introducing a vector comprising a nucleic acid sequence of the present invention into a host cell so that the vector is maintained as a chromosomal integrant or as a self- replicating extra-chromosomal vector. Integration is generally considered to be an advantage as the nucleic acid sequence is more likely to be stably maintained in the cell. Integration of the vector into the host chromosome may occur by homologous or non-homologous recombination as described above. The choice of a host cell will to a large extent depend upon the gene encoding the modified lipolytic enzyme and its source. In addition, the choice of host cell will often depend on the proteolytic enzyme system of the host cell and its impact on the production of a modified lipolytic enzyme of the invention. Accordingly, it may be desirable to use a host cell which is deficient in one or more proteolytic enzymes or other enzyme processing means. Protease deficient host cells of bacteria as well as fungal (filamentous fungal and yeast) cells are well-known in the art.

The host cell may be a unicellular microorganism or a non-unicellular microorganism. Useful unicellular cells are bacterial cells such as gram positive bacteria including, but not limited to, a Bacillus cell, e.g., B. subtilis, B. licheniformis, B. lentus, B. brevis, B. stearothermophilus, B. alkalophilus, B. amyloliquefaciens, B. coagulans, B.circulans, B. lautus, B. megaterium, and B. thuringiensis, or a Streptomyces cell, e.g., S. lividans or S. murinus, or gram negative bacteria such as E. coli and Pseudomonas sp. (especially when a bacterial lipolytic enzyme, such as a Pseudomonas sp. enzyme is to be produced). The transformation of a bacterial host cell may, for instance, be effected by protoplast transformation (see, e.g., Chang and Cohen, 1979, Molecular General Genetics 168:111-115), by using competent cells (see, e.g., Young and Spizizin, 1961, Journal of Bacteriology 81:823-829, or Dubnar and Davidoff-Abelson, 1971, Journal of Molecular Biology 56:209-221), by electroporation (see, e.g., Shigekawa and Dower, 1988, Biotechniques 6:742-751), or by conjugation (see, e.g., Koehler and Thome, 1987, Journal of Bacteriology 169:5771-5278).

The host cell may be a eukaryote, and is preferably a fungal, i.e. a yeast cell or a filamentous fungal cell, especially for the production of a modified lipolytic enzyme of eukaryotic origin.

"Yeast" as used herein includes ascosporogenous yeast (Endomycetales), basidiosporogenous yeast, and yeast belonging to the Fungi Imperfecti (Blastomycetes). The ascosporogenous yeasts are divided into the families Spermophthoraceae and Saccharomycetaceae. The latter is comprised of four subfamilies, Schizosaccharomycoideae (e.g., genus Schizosaccharomyces), Nadsonioideae, Lipomycoideae, and Saccharomycoideae (e.g., genera Pichia, Kluyveromyces and Saccharomyces). The basidiosporogenous yeasts include the genera Leucosporidim, Rhodosporidium, Sporidiobolus, Filobasidium, and Filobasidiella. Yeast belonging to the Fungi Imperfecti are divided into two families, Sporobolomycetaceae (e.g., genera Sorobolomyces and Bullera) and Cryptococcaceae (e.g., genus Candida). Since the classification of yeast may change in the future, for the purposes of this invention, yeast shall be defined as described in Biology and Activities of Yeast (Skinner, F.A., Passmore, S.M., and Davenport, R.R., eds, Soc. App. Bacteriol. Symposium Series No. 9, 1980. The biology of yeast and manipulation of yeast genetics are well known in the art (see, e.g., Biochemistry and Genetics of Yeast, Bacil, M., Horecker, B.J., and Stopani, A.O.M., editors, 2nd edition, 1987; The Yeasts, Rose, A.H., and Harrison, J.S., editors, 2nd edition, 1987; and The Molecular Biology of the Yeast Saccharomyces, Strathem et al., editors, 1981). In connection with the present invention the use of yeast cells which typically have another proteolytic enzyme processing system that, e.g., bacteria and filamentous fungi, may be of particular use for preparing modified lipolytic enzymes which, as the peptide addition, comprise a part or all of the natural prosequences of the parent lipolytic enzyme in question. When the fungal host cell is a yeast cell (e.g. to be used in applying a peptide addition (in the form of part of or the entire prosequence of the parent enzyme, the yeast host cell may be a cell of a species of Candida, Kluyveromyces, Saccharomyces, Schizosaccharomyces, Pichia, or Yarrσwia, such as a S. cerevisiae cell, a S.s carlsbergensis, a S. diastaticus cell, a S. douglasii cell, a S. kluyveri cell, a S. norbensis cell, or a S. oviformis cell.

"Fungi" as used herein includes the phyla Ascomycota, Basidiomycota, Chytridiomycota, and Zygomycota (as defined by Hawksworth et al. , In, Ainsworth and Bisby 's Dictionary of The Fungi, 8th edition, 1995, CAB International, University Press, Cambridge, UK) as well as the Oomycota (as cited in Hawksworth et al., 1995, supra, page 171) and all mitosporio fungi (Hawksworth et al., 1995, supra). Representative groups of Ascomycota include, e.g., Neurospora, Eupenicillium (=Penicillium), Emericella (=Aspergillus), Eurotium (=Aspergillus), and the true yeasts listed above. Examples of Basidiomycota include mushrooms, rusts, and smuts. Representative groups of Chytridiomycota include, e.g., Allomyces, Blastocladiella, Coelomomyces, and aquatic fungi. Representative groups of Oomycota include, e.g., Saprolegniomycetous aquatic fungi (water molds) such as Achlya. Examples of mitosporic fungi include Aspergillus, Penicillium, Candida, and Alternaria. Representative groups of Zygomycota include, e.g., Rhizopus and Mucor.

''Filamentous fungi" include all filamentous forms of the subdivision Eumycota and Oomycota (as defined by Hawksworth et al., 1995, supra). The filamentous fungi are characterized by a vegetative mycelium composed of chitin, cellulose, glucan, chitosan, mannan, and other complex polysaccharides. Vegetative growth is by hyphal elongation and carbon catabolism is obligately aerobic. In contrast, vegetative growth by yeasts such as Saccharomyces cerevisiae is by budding of a unicellular thallus and carbon catabolism may be fermentative. In a preferred embodiment, the fungal host cell is a filamentous fungal cell. In a more preferred embodiment, the filamentous fungal host cell is a cell of a species of, but not limited to,

Acremonium, Aspergillus, Fusarium, Humicola, Myceliophthora, Mucor, Neurospora,

Penicillium, Thielavia, Tolypocladium, and Trichoderma. In an even more preferred embodiment, the filamentous fungal host cell is an Aspergillus cell. In another even more preferred embodiment, the filamentous fungal host cell is a Fusarium cell. In a most preferred embodiment, the filamentous fungal host cell is an A. oryzae cell, an A. niger cell, an A.foetidus cell, or an A. japonicus cell. In another most preferred embodiment, the filamentous fungal host cell is a Fusarium oxysporum cell or a F. graminearum cell.

Fungal cells may be transformed by a process involving protoplast formation, transformation of the protoplasts, and regeneration of the cell wall in a manner known per se. Suitable procedures for transformation of Aspergillus host cells are described in EP 238 023 and Yelton et al., 1984, Proceedings of the National Academy of Sciences USA 81:1470-1474. A suitable method of transforming Fusarium species is described by Malardier et al., 1989, Gene 78:147-156 or in WO 96/00787. Yeast may be transformed using the procedures described by Becker and Guarente, In Abelson, J.N. and Simon, M.I., editors, Guide to Yeast Genetics and Molecular Biology, Methods in Enzymology, Volume 194, pp 182-187, Academic Press, Inc., New York; Ito et al., 1983, Journal of Bacteriology 153:163; and Hinnen et al., 1978, Proceedings of the National Academy of Sciences USA 75:1920. Mammalian cells may be transformed by direct uptake using the calcium phosphate precipitation method of Graham and Van der Eb (1978, Virology 52:546).

Host cells used according to the invention may advantagously be protease deficient or protease minus strains (or the like), such as strains deficient of proteases, especially exoproteases, capable of cleaving the modified lipolytic enzyme at a site close to the peptide addition (in certain case being the propeptide). Especially relevante host cells are the host cells deficient of the tripeptidyl-aminopeptidases (TPAP) (see e.g. WO 96/14404 from Novo Nordisk A/S), deficient of dipeptidyl-aminopeptidases (DPAP), or host cells deficient of a Kex2 protease or a

Kex2-like protease and therefore not capable of cleaving at di-basic site such as Arg- Arg (RR) .

Other examples of host cells include the aspartic proteinase deficient host cells described in EP 429 490 (from Genencor Inc), host cells deficient of proteolytic enzymes such as the host cells described in WO 93/00925 (Amgen), WO 92/17595 (Salk Inst Biotech), EP 341 215, EP 574347, and PCTVDK96/00111 (Novo Nordisk A/S).

In the Examples below an Aspergillus oryzae host cell, with a deleted alkaline protease gene, have been used.

Methods of Production

The present invention also relates to methods for producing a modified lipolytic enzyme of the invention comprising (a) cultivating a host cell transformed with a DNA sequence encoding the enzyme under conditions conducive to expression of the modified lipolytic enzyme; and (b) recovering the modified lipolytic enzyme.

The host cells may be cultivated in a nutrient medium suitable for production of the modified lipolytic enzyme using methods known in the art. For example, the cell may be cultivated by shake flask cultivation, small-scale or large-scale fermentation (including continuous, batch, fed-batch, or solid state fermentations) in laboratory or industrial fermentors performed in a suitable medium and under conditions allowing the modified lipolytic enzyme to be expressed and/or isolated. The cultivation takes place in a suitable nutrient medium comprising carbon and nitrogen sources and inorganic salts, using procedures known in the art (see, e.g., references for bacteria and yeast; Bennett, J.W. and LaSure, L., editors, More Gene Manipulations in Fungi, Academic Press, CA, 1991). Suitable media are available from commercial suppliers or may be prepared according to published compositions (e.g., in catalogues of the American Type Culture Collection). If the modified lipolytic enzyme is secreted into the nutrient medium, the modified lipolytic enzyme can be recovered directly from the medium. If the modified lipolytic enzyme is not secreted, it is recovered from cell lysates.

The resulting modified lipolytic enzyme may be recovered by methods known in the art. For example, the modified lipolytic enzyme may be recovered from the nutrient medium by conventional procedures including, but not limited to, centrifugation, filtration, extraction, spray- drying, evaporation, or precipitation. The recovered modified lipolytic enzyme may then be further purified by a variety of chromatographic procedures, e.g., ion exchange chromatography, gel filtration chromatography, affinity chromatography, or the like.

The modified lipolytic enzymes of the present invention may be purified by a variety of procedures known in the art including, but not limited to, chromatography (e.g., ion exchange, affinity, hydrophobic, chromatofocusing, and size exclusion), electrophoretic procedures (e.g., preparative isoelectric focusing (IEF), differential solubility (e.g., ammonium sulfate precipitation), or extraction (see, e.g., Protein Purification, J.-C. Janson and Lars Ryden, editors, VCH Publishers, New York, 1989).

In a preferred embodiment of the invention a peptide addition is applied to the parent enzyme by cultivating a host cell comprising a DNA sequence encoding the pre, pro or prepro-form of the parent lipolytic enzyme, the DNA sequence optionally being present on a vector, and recovering the resulting modified lipolytic enzyme. The host cell, cultivation condition and/or recovery conditions being selected so that at the most a partial processing of the pre, pro or preproform of the parent enzyme has occured resulting in that at least 5%, such as at least 10%, such as at least 15%, such as at least 20%, such as at least 25%, such as at least 50% or at least 75% of the produced modified enzyme molecules comprises the desired , e.g. the entire pre- sequence or a substantial part thereof Enzyme composition of the invention

In a further aspect the invention relates to an enzyme composition comprising an enzyme with lipolytic activity of the invention.

As defined herein, a "substantially pure" enzyme is an enzyme which is essentially free of other homologous contaminants (originating from the same source as the modified lipolytic enzyme), e.g., at least about 20% pure, preferably at least about 40% pure, more preferably about 60% pure, even more preferably about 80% pure, most preferably about 90% pure, and even most preferably about 95% pure, as determined by SDS-PAGE.

In certain cases the host cell does not process all of the modified lipolytic enzyme molecules expressed by that host at the same cleavage site, resulting in a modified enzyme product consisting of a portion having the full length peptide addition and one or more other portions with only a part of the peptide addition. The inventors found that this does not influence the wash performance significantly. Consequently, even though not all of the lipolytic enzyme of the enzyme composition of the invention may have retained the full length peptide addition the enzyme composition is still capable of exerting the desired effect, such as an improved wash performance. Actually, it has been found that as long as at least about 5% of the total amount of modified lipolytic enzyme of the invention to be used for a given purpose has the intact peptide addition as disclosed above, this may be found to be sufficient for providing the desired effect. The remaining part of the modified lipolytic enzyme molecules may then have a peptide addition which is shorter than the one intended (e.g. as a consequence of one or more amino acid residues have been cut off during processing of the enzyme by the host organism) or no peptide addition at all. Therefore, the enzyme composition of the invention need only to comprise at least about 5%, preferably at least about 10%, such as at least about 25%, better at least about 50%, especially at least about 75% of the modified lipolytic enzyme with its full length addition.

Said enzyme composition may further comprise an enzyme selected from the group of proteases, cellulases, peroxidases, cutinases, amylases and/or lipases, and when intended for washing also ingredients normally used in detergent compositions.

Modified lipolytic enzymes of the invention have been found to be of particular interest as components in detergent compositions such as washing powder or dishwashing compositions which will be described in details in the following section. In addition, due to their improved properties the modified lipolytic enzymes of the invention are contemplated to be useful in, for example, the baking industry, as a catalyst in organic syntheses (e.g. esterification, transesterification or ester hydrolysis reactions), in the papermalring industry (e.g. for pitch removal), and in the leather, wool and related industries (e.g. for degreasing of animal hides, sheepskin or wool), and for other applications involving degreasing/defatting.

DETERGENT DISCLOSURE

Surfactant system

The detergent compositions according to the present invention comprise a surfactant system wherein the surfactant can be selected from nonionic and/or anionic and/or cationic and/or ampholytic and/or zwitterionic and/or semi-polar surfactants. The surfactant is typically present at a level of from 0.1 % to 60% by weight.

The surfactant is preferably formulated to be compatible with enzyme components present in the composition. In liquid or gel compositions the surfactant is most preferably formulated such that it promotes, or at least does not degrade, the stability of any enzyme in these compositions.

Preferred surfactant systems to be used according to the present invention comprise as a surfactant one or more of the nonionic and/or anionic surfactants described herein. Nonionic detergent surfactants normally consist of a water-solubilizing polyalkoxylene or a mono- or di-alkanolamide group in chemical combination with an organic hydrophobic group derived, for example, from alkylphenols in which the alkyl group contains from about 6 to about 12 carbon atoms, dialkylphenols in which each alkyl group contains from 6 to 12 carbon atoms, primary, sedondary or tertiary aliphatic alcohols (or alkylcapped derivatives thereof), preferably having from 8 to 20 carbon atoms, monocarboxylic acids having from 10 to about 24 carbon atoms in the alkyl group and polyproxylenes. Also common are fatty acid mono- and dialkanolamides in which the alkyl group of the fatty acid radical contains from 10 to about 20 carbon atoms and the alkyloyl group having from 1 to 3 carbon atoms. Optionally, in any of the mono- and di-alkanolamide derivatives there may be a polyoxyalkylene moiety joining the latter groups and the hydrophobic part of the molecule. In all polyalkoxylene containing surfactants, the polyalkoxylene moiety preferably consists of from 2 to 20 groups of ethylene oxide or of ethylene oxide and propylene oxide groups. Polyethylene, polypropylene, and polybutylene oxide condensates of alkyl phenols are suitable for use as the nonionic surfactant of the surfactant systems of the present invention, with the polyethylene oxide condensates being preferred. These compounds include the condensation products of alkyl phenols having an alkyl group containing from about 6 to about 14 carbon atoms, preferably form about 8 to about 14 carbon atoms, in either a straightchain or branched-chain configuration with the alkylene oxide. In a preferred embodiment, the ethylene oxide is present in an amount equal to from about 2 to about 25 moles, more preferably from about 3 to about 15 moles, of ethylene oxide per mole of alkyl phenol. Commercially available nonionic surfactants of this type include Igepal™

CO-630, marketed by the GAF Corporation; and Triton™ X-45, X-114, X-100 and X- 102, all marketed by the Rohm & Haas Company. These surfactants are commonly referred to as alkylphenol alkoxylates (e.g., alkyl phenol ethoxylates).

The condensation products of primary and secondary aliphatic alcohols with from about 1 to about 25 moles of ethylene oxide are suitable for use as the nonionic surfactant of the nonionic surfactant systems of the present invention. The alkyl chain of the aliphatic alcohol can either be straight or branched, primary or secondary, and generally contains from about 8 to about 22 carbon atoms. Preferred are the condensation products of alcohols having an alkyl group containing from about 8 to about 20 carbon atoms, more preferably from about 10 to about 18 carbon atoms, with from about 2 to about 10 moles of ethylene oxide per mole of alcohol. About 2 to about 7 moles of ethylene oxide and most preferably from 2 to 5 moles of ethylene oxide per mole of alcohol are present in said condensation products. Examples of commercially available nonionic surfactants of this type include Tergitol™ 15-S-9 (The condensation product of C₁₁-C₁₅ linear alcohol with 9 moles ethylene oxide), Tergitol™ 24-L-6 NMW (the condensation product of C₁₂-C₁₄ primary alcohol with 6 moles ethylene oxide with a narrow molecular weight distribution), both marketed by Union Carbide Corporation; Neodol™ 45-9 (the condensation product of C₁₄-C₁₅ linear alcohol with 9 moles of ethylene oxide), Neodol™ 23- 3 (the condensation product of C₁₂-C₁₃ linear alcohol with 3.0 moles of ethylene oxide), Neodol™ 45-7 (the condensation product of C,₄-C₁₅ linear alcohol with 7 moles of ethylene oxide), Neodol™ 45-5 (the condensation product of C₁₄-C₁₅ linear alcohol with 5 moles of ethylene oxide) marketed by Shell Chemical Company, Kyro™ EOB (the condensation product of C₁₃-C₁₅ alcohol with 9 moles ethylene oxide), marketed by The Procter & Gamble Company, and Genapol LA 050 (the condensation product of C₁₂-C₁₄ alcohol with 5 moles of ethylene oxide) marketed by Hoechst. Preferred range of HLB in these products is from 8-11 and most preferred from 8-10. The detergent composition of the invention may comprise a nonionic material which is alkoxylated aliphatic alcohols containing at least 25 alkylene oxide groups, preferably at least 50 alkylene oxide groups, and more preferably at least 80 alkylene oxide groups. Also useful as the nonionic surfactant of the surfactant systems of the present invention are alkylpolysaccharides disclosed in US 4,565,647, having a hydrophobic group containing from about 6 to about 30 carbon atoms, preferably from about 10 to about 16 carbon atoms and a polysaccharide, e.g. a polyglycoside, hydrophillic group containing from about 1.3 to about 10, preferably from about 1.3 to about 3, most preferably from about 1.3 to about 2.7 saccharide units. Any reducing saccharide containing 5 or 6 carbon atoms can be used, e.g., glucose, galactose and galactosyl moieties can be substituted for the glucosyl moieties (optionally the hydrophobic group is attached at the 2-, 3-, 4-, etc. positions thus giving a glucose or galactose as opposed to a glucoside or galactoside). The intersaccharide bonds can be, e.g., between the one position of the additional saccharide units and the 2-, 3-, 4-, and/or 6- positions on the preceding saccharide units. Another useful nonionic surfactant is a glycoside of a uronic acid, a uronic acid salt or a uronic acid lactone or polyuronic acid with a straight-chain or branced saturated or unsaturated aliphatic chain of from 6 to 24 carbon atoms, optionally containing an aromatic, cycloaliphatic, mixed aromatic-aliphatic or polyalkyloxyalkyl radical, as described in WO 95/10524.

The preferred alkylpolyglycosides have the formula

R²O(C_nH_2nO)_t(glycosyl)_x wherein R² is selected from the group consisting of alkyl, alkylphenyl, hydroxyalkyl, hydroxyalkylphenyl, and mixtures thereof in which the alkyl groups contain from about 10 to about 18, preferably from about 12 to about 14, carbon atoms; n is 2 or 3, preferably 2; t is from 0 to about 10, preferably 0; and x is from about 1.3 to about 10, preferably from about 1.3 to about 3, most preferably from about 1.3 to about 2.7. The glycosyl is preferably derived from glucose. To prepare these compounds, the alcohol or alkylpolyethoxy alcohol is formed first and then reacted with glucose, or a source of glucose, to form the glucoside (attachment at the 1 -position). The additional glycosyl units can then be attached between their 1-position and the preceding glycosyl units 2-, 3-, 4-, and/or 6-position, preferably predominately the 2-position.

The condensation products of ethylene oxide with a hydrophobic base formed by the condensation of propylene oxide with propylene glycol are also suitable for use as the additional nonionic surfactant systems of the present invention. The hydrophobic portion of these compounds will preferably have a molecular weight of from about 1500 to about

1800 and will exhibit water insolubility. The addition of polyoxyethylene moieties to this hydrophobic portion tends to increase the water solubility of the molecule as a whole, and the liquid character of the product is retained up to the point where the polyoxyethylene content is about 50% of the total weight of the condensation product, which corresponds to condensation with up to about 40 moles of ethylene oxide. Examples of compounds of this type include certain of the commercially available Pluronic™ surfactants, marketed by BASF.

Also suitable for use as the nonionic surfactant of the nonionic surfactant system of the present invention, are the condensation products of ethylene oxide with the product resulting from the reaction of propylene oxide and ethylenediamine. The hydrophobic moiety of these products consists of the reaction product of ethylenediamine and excess propylene oxide, and generally has a molecular weight of from about 2500 to about 3000. This hydrophobic moiety is condensed with ethylene oxide to the extent that the condensation product contains from about 40% to about 80% by weight of polyoxyethylene and has a molecular weight of from about 5,000 to about 11.000. Examples of this type of nonionic surfactant include certain of the commercially available Tetronic™ compounds, marketed by BASF.

Preferred for use as the nonionic surfactant of the surfactant systems of the present invention are polyethylene oxide condensates of alkyl phenols, condensation products of primary and secondary aliphatic alcohols with from about 1 to about 25 moles of ethyleneoxide, alkylpolysaccharides, and mixtures hereof. Most preferred are C₈-C₁₄ alkyl phenol ethoxylates having from 3 to 15 ethoxy groups and C₈-C₁₈ alcohol ethoxylates (preferably C₁₀ avg.) having from 2 to 10 ethoxy groups, and mixtures thereof. Highly preferred nonionic surfactants are polyhydroxy fatty acid amide surfactants of the formula

wherein R¹ is H, or R¹ is C_1-4 hydrocarbyl, 2-hydroxy ethyl, 2-hydroxy propyl or a mixture thereof, R² is C_5-31 hydrocarbyl, and Z is a polyhydroxyhydrocarbyl having a linear hydrocarbyl chain with at least 3 hydroxyls directly connected to the chain, or an alkoxylated derivative thereof. Preferably, R¹ is methyl, R² is straight C_11-15 alkyl or C_16-18 alkyl or alkenyl chain such as coconut alkyl or mixtures thereof, and Z is derived from a reducing sugar such as glucose, fructose, maltose, lactose, in a reductive animation reaction.

A nonionic surfactant system comprising an alkoxylated nonionic surfactant having an average degree of alkoxylation of at least 6 and an aldobionamide of the structure ANR₁R₂ wherein A is a sugar moiety which is an aldobionic acid except that it does not contain the OH group normally extending from the carbonyl group on the aldonic acid. NR,R₂ is attached where the hydroxyl group on the aldobionic acid would normally be found. R₁R₂, may be the same or different, is a hydrogen atom, an aliphatic hydrocarbon radical, an aromatic radical a cycloaliphatic radical an amino acid ester, or an ether amine. R₁ and R₂ cannot both be hydrogen atoms as described in WO 95/2770.

Other so-called nonionic detergent compounds include long chain tertiary amine oxides, long chain tertiary phosphine oxides and dialkyl sulphoxides.

Highly preferred anionic surfactants include alkyl alkoxylated sulfate surfactants hereof are water soluble salts or acids of the formula RO(A)_mSO₃M wherein R is an unsubstituted C₁₀-C-₂₄ alkyl or hydroxyalkyl group having a C₁₀-C₂₄ alkyl component, preferably a C₁₂-C₂₀ alkyl or hydroxyalkyl, more preferably C₁₂-C₁₈ alkyl or hydroxyalkyl, A is an ethoxy or propoxy unit, m is greater than zero, typically between about 0.5 and about 6, more preferably between about 0.5 and about 3, and M is H or a cation which can be, for example, a metal cation (e.g., sodium, potassium, lithium, calcium, magnesium, etc.), ammonium or substituted-ammonium cation. Alkyl ethoxylated sulfates as well as alkyl propoxylated sulfates are contemplated herein. Specific examples of substituted ammonium cations include methyl-, dimethyl, trimethyl-ammonium cations and quaternary ammonium cations such as tetramethyl-ammonium and dimethyl piperdinium cations and those derived from alkylamines such as ethylamine, diethylamine, triethylamine, mixtures thereof, and the like. Exemplary surfactants are C,₂-C,₈ alkyl polyethoxylate (1.0) sulfate (C₁₂-C₁₈E(1.0)M), C₁₂-C₁₈ alkyl polyethoxylate (2.25) sulfate (C₁₂-C₁₈(2.25)M, and C₁₂-C₁₈ alkyl polyethoxylate (3.0) sulfure (C₁₂- C₁₈E(3.0)M), and C₁₂-C₁₈ alkyl polyethoxylate (4.0) sulfate (C₁₂-C₁₈E(4.0)M), wherein M is conveniently selected from sodium and potassium. Suitable anionic surfactants to be used are alkyl ester sulfonate surfactants including linear esters of C₈-C₂₀ carboxylic acids (i.e., fatty acids) which are sulfonated with gaseous SO₃ according to "The Journal of the American Oil Chemists Society", 52 (1975), pp. 323-329. Suitable starting materials would include natural fatty substances as derived from tallow, palm oil, etc. The preferred alkyl ester sulfonate surfactant, especially for laundry applications, comprise alkyl ester sulfonate surfactants of the structural formula:

wherein R³ is a C₈-C₂₀ hydrocarbyl, preferably an alkyl, or combination thereof, R⁴ is a C₁-C₆ hydrocarbyl, preferably an alkyl, or combination thereof, and M is a cation which forms a water soluble salt with the alkyl ester sulfonate. Suitable salt-forming cations include metals such as sodium, potassium, and lithium, and substituted or unsubstituted ammonium cations, such as monoethanolamine, diethonolamine, and triethanolamine. Preferably, R³ is C₁₀-C₁₆ alkyl, and R⁴ is methyl, ethyl or isopropyl. Especially preferred are the methyl ester sulfonates wherein R³ is C₁₀-C₁₆ alkyl.

Other suitable anionic surfactants include the alkyl sulfate surfactants which are water soluble salts or acids of the formula ROSO₃M wherein R preferably is a C₁₀-C₂₄ hydrocarbyl, preferably an alkyl or hydroxyalkyl having a C₁₀-C₂₀ alkyl component, more preferably a C₁₂-C₁₈ alkyl or hydroxyalkyl, and M is H or a cation, e.g., an alkali metal cation (e.g. sodium, potassium, lithium), or ammonium or substituted ammonium (e.g. methyl-, dimethyl-, and trimethyl ammonium cations and quaternary ammonium cations such as tetramethyl-ammonium and dimethyl piperdinium cations and quaternary ammonium cations derived from alkylamines such as ethylamine, diethylamine, triethylamine, and mixtures thereof, and the like). Typically, alkyl chains of C₁₂-C₁₆ are preferred for lower wash temperatures (e.g. below about 50°C) and C₁₆-C₁₈ alkyl chains are preferred for higher wash temperatures (e.g. above about 50°C). Other anionic surfactants useful for detersive purposes can also be included in the laundry detergent compositions of the present invention. Theses can include salts (including, for example, sodium, potassium, ammonium, and substituted ammonium salts such as mono- di- and triethanolamine salts) of soap, C₈-C₂₂ primary or secondary alkanesulfonates, C₈- C₂₄ olefinsulfonates, sulfonated polycarboxylic acids prepared by sulfonation of the pyrolyzed product of alkaline earth metal citrates, e.g., as described in GB 1,082,179, C₈-C₂₄ alkylpolyglycolethersulfa.es (containing up to 10 moles of ethylene oxide); alkyl glycerol sulfonates, fatty acyl glycerol sulfonates, fatty oleyl glycerol sulfates, alkyl phenol ethylene oxide ether sulfates, paraffin sulfonates, alkyl phosphates, isethionates such as the acyl isethionates, isethionates esters of alkoxy carboxylic acids (as described in WO95/ 14661), N-acyl taurates, alkyl succinamates and sulfosuccinates, monoesters of sulfosuccinates (especially saturated and unsaturated C₁₂-C₁₈ monoesters) and diesters of sulfosuccinates (especially saturated and unsaturated C₆-C₁₂ diesters), acyl sarcosinates, oleoyl sarcosinate, sulfates of alkylpolysaccharides such as the sulfates of alkylpolyglucoside (the nonionic nonsulfated compounds being described below), branched primary alkyl sulfates, and alkyl polyethoxy carboxylates such as those of the formula RO(CH₂CH₂O)_k-CH₂COO-M+ wherein R is a C₈-C₂₂ alkyl, k is an integer from 1 to 10, and M is a soluble salt forming cation. Resin acids and hydrogenated resin acids are also suitable, such as rosin, hydrogenated rosin, and resin acids and hydrogenated resin acids present in or derived from tall oil. Alkylbenzene sulfonate is highly preferred, in particular linear alkyl benzene sulfonate (LAS) where the alkyl group contains preferably from 10 to 18 carbon atoms.

Further examples are described in "Surface Active Agents and Detergents" (Vol. I and II by Schwartz, Perrry and Berch). A variety of such surfactants are also generally disclosed in US 3,929,678, (Column 23, line 58 through Column 29, line 23). When included therein, the laundry detergent compositions of the present invention typically comprise from about 1 % to about 40%, preferably from about 3% to about 20% by weight of such anionic surfactants.

The laundry detergent compositions of the present invention may also contain cationic, ampholytic, zwitterionic, and semi-polar surfactants, as well as the nonionic and/or anionic surfactants other than those already described herein.

Cationic detersive surfactants suitable for use in the laundry detergent compositions of the present invention are those having one long-chain hydrocarbyl group. Examples of such cationic surfactants include the ammonium surfactants such as alkyltrimethylammonium halogenides, and those surfactants having the formula:

[R²(OR³)_y] [R⁴(OR³)_y]₂R⁵N + X- wherein R² is an alkyl or alkyl benzyl group having from about 8 to about 18 carbon atoms in the alkyl chain, each R³ is selected form the group consisting of -CH₂CH₂-, - CH₂CH(CH₃)-, -CH₂CH(CH₂OH)-, -CH₂CH₂CH₂-, and mixtures thereof; each R⁴ is selected from the group consisting of C₁-C₄ alkyl, C₁-C₄ hydroxyalkyl, benzyl ring structures formed by joining the two R⁴ groups, -CH₂CHOHCHOHCOR⁶CHOHCH₂OH wherein R⁶ is any hexose or hexose polymer having a molecular weight less than about

1000, and hydrogen when y is not 0; R⁵ is the same as R⁴ or is an alkyl chain wherein the total number of carbon atoms or R² plus R⁵ is not more than about 18; each y is from 0 to about 10 and the sum of the y values is form 0 to about 15; and X is any compatible anion.

Highly preferred cationic surfactants are the water soluble quaternary ammonium compounds useful in the present composition having the formula: R₁R₂R₃R₄N⁺X- (i) wherein R, is C₈-C₁₆ alkyl, each of R₂, R₃ and R₄ is independently C₁-C₄ alkyl, C₁-C₄ hydroxy alkyl, benzyl, and -(C₂H₄₀)_xH where x has a value from 2 to 5, and X is an anion. Not more than one of R₂, R₃ or R₄ should be benzyl.

The preferred alkyl chain length for R₁ is C₁₂-C₁₅ particularly where the alkyl group is a mixture of chain lengths derived from coconut or palm kernel fat or is derived synthetically by olefin build up or OXO alcohols synthesis. Preferred groups for R₂R₃ and R₄ are methyl and hydroxyethyl groups and the anion X may be selected from halide, methosulphate, acetate and phosphate ions. Examples of suitable quaternary ammonium compounds of formulae (i) for use herein are:

coconut trimethyl ammonium chloride or bromide;

coconut methyl dihydroxyethyl ammonium chloride or bromide;

decyl triethyl ammonium chloride;

decyl dimethyl hydroxyethyl ammonium chloride or bromide;

C_12-15 dimethyl hydroxyethyl ammonium chloride or bromide;

coconut dimethyl hydroxyethyl ammonium chloride or bromide;

myristyl trimethyl ammonium methyl sulphate;

lauryl dimethyl benzyl ammonium chloride or bromide;

lauryl dimethyl (ethenoxy)₄ ammonium chloride or bromide;

choline esters (compounds of formula (i) wherein R₁ is

di-alkyl imidazolines [compounds of formula (i)].

Other cationic surfactants useful herein are also described in US 4,228,044 and in EP 000 224.

When included therein, the laundry detergent compositions of the present invention typically comprise from 0.2% to about 25%, preferably from about 1 % to about 8% by weight of such cationic surfactants. Ampholytic surfactants are also suitable for use in the laundry detergent compositions of the present invention. These surfactants can be broadly described as aliphatic derivatives of secondary or tertiary amines, or aliphatic derivatives of heterocyclic secondary and tertiary amines in which the aliphatic radical can be straight- or branched-chain. One of the aliphatic substituents contains at least about 8 carbon atoms, typically from about 8 to about 18 carbon atoms, and at least one contains an anionic water-solubilizing group, e.g. carboxy, sulfonate, sulfate. See US 3,929,678 (column 19, lines 18-35) for examples of ampholytic surfactants.

When included therein, the laundry detergent compositions of the present invention typically comprise from 0.2% to about 15%, preferably from about 1 % to about 10% by weight of such ampholytic surfactants.

Zwitterionic surfactants are also suitable for use in laundry detergent compositions. These surfactants can be broadly described as derivatives of secondary and tertiary amines, derivatives of heterocyclic secondary and tertiary amines, or derivatives of quaternary ammonium, quaternary phosphonium or tertiary sulfonium compounds. See US 3,929,678 (column 19, line 38 through column 22, line 48) for examples of zwitterionic surfactants. When included therein, the laundry detergent compositions of the present invention typically comprise from 0.2% to about 15%, preferably from about 1 % to about 10% by weight of such zwitterionic surfactants. Semi-polar nonionic surfactants are a special category of nonionic surfactants which include water-soluble amine oxides containing one alkyl moiety of from about 10 to about 18 carbon atoms and 2 moieties selected from the group consisting of alkyl groups and hydroxyalkyl groups containing from about 1 to about 3 carbon atoms; watersoluble phosphine oxides containing one alkyl moiety of form about 10 to about 18 carbon atoms and 2 moieties selected from the group consisting of alkyl groups and hydroxyalkyl groups containing from about 1 to about 3 carbon atoms; and water-soluble sulfoxides containing one alkyl moiety of from about 10 to about 18 carbon atoms and a moiety selected from the group consisting of alkyl and hydroxyalkyl moieties of from about 1 to about 3 carbon atoms.

Semi-polar nonionic detergent surfactants include the amine oxide surfactants having the formula:

wherein R³ is an alkyl, hydroxyalkyl, or alkyl phenyl group or mixtures thereof containing from about 8 to about 22 carbon atoms; R⁴ is an alkylene or hydroxyalkylene group containing from about 2 to about 3 carbon atoms or mixtures thereof; x is from 0 to about 3: and each R⁵ is an alkyl or hydroxyalkyl group containing from about 1 to about 3 carbon atoms or a polyethylene oxide group containing from about 1 to about 3 ethylene oxide groups. The R⁵ groups can be attached to each other, e.g., through an oxygen or nitrogen atom, to form a ring structure.

These amine oxide surfactants in particular include C₁₀-C₁₈ alkyl dimethyl amine oxides and C₈-C₁₂ alkoxy ethyl dihydroxy ethyl amine oxides.

When included therein, the laundry detergent compositions of the present invention typically comprise from 0.2% to about 15%, preferably from about 1 % to about 10% by weight of such semi-polar nonionic surfactants. Builder system

The compositions according to the present invention may further comprise a builder system. Any conventional builder system is suitable for use herein including aluminosilicate materials, silicates, polycarboxylates and fatty acids, materials such as ethylenediamine tetraacetate, metal ion sequestrants such as aminopolyphosphonates, particularly ethylenediamine tetramethylene phosphonic acid and diethylene triamine pentamethylenephosphonic acid. Phosphate builders can also be used herein, e.g pyrophosphates, orthophosphates or polyphosphates.

Suitable builders can be an inorganic ion exchange material, commonly an inorganic hydrated aluminosilicate material, more particularly a hydrated synthetic zeolite such as hydrated zeolite A, X, B, HS or MAP. Another suitable inorganic buUder material is layered silicate, e.g. SKS-6 (Hoechst). SKS-6 is a crystalline layered silicate consisting of sodium silicate (Na₂Si₂O₅).

Suitable polycarboxylates containing one carboxy group include lactic acid, glycolic acid and ether derivatives thereof as disclosed in BE 831,368, BE 821,369 and BE 821,370. Polycarboxylates containing two carboxy groups include the water-soluble salts of succinic acid, malonic acid, (ethylenedioxy) diacetic acid, maleic acid, diglycollic acid, tartaric acid, tartronic acid and fumaric acid, as well as the ether carboxylates described in DE 2,446,686, DE 2,446,487, US 3,935,257 and the sulfinyl carboxylates described in BE 840,623. Polycarboxylates containing three carboxy groups include, in particular, water-soluble citrates, aconitrates and citraconates as well as succinate derivatives such as the carboxymethyloxysuccinates described in GB 1,379,241, lactoxysuccinates described in NL application 7205873, and the oxypolycarboxylate materials such as 2-oxa-1,1,3-propane tricarboxylates described in GB 1,387,447.

Polycarboxylates containing four carboxy groups include oxydisuccinates disclosed in GB 1,261,829, 1,1, 2,2, -ethane tetracarboxylates, 1,1,3,3-propane tetracarboxylates containing sulfo substituents include the sulfosuccinate derivatives disclosed in GB 1,398,421 and GB 1,398,422 and in US 3,936,448, and the sulfonated pyrolysed citrates described in GB 1,082,179, while polycarboxylates containing phosphone substituents are disclosed in GB 1,439,000.

Alicyclic and heterocyclic polycarboxylates include cyclopentane-cis,cis-cis-tetracarboxylates, cyclopentadienide pentacarboxylates, 2,3,4,5-tetrahydro-furan - cis, cis, cis-tetracarboxylates, 2,5-tetrahydro-furan-cis, discarboxylates, 2,2,5,5,- tetrahydrofuran - tetracarboxylates, 1,2,3,4,5,6-hexane - hexacarboxylates and carboxymethyl derivatives of polyhydric alcohols such as sorbitol, mannitol and xylitol. Aromatic polycarboxylates include mellitic acid, pyromellitic acid and the phthalic acid derivatives disclosed in GB 1,425,343. Of the above, the preferred polycarboxylates are hydroxycarboxylates containing up to three carboxy groups per molecule, more particularly citrates.

Preferred builder systems for use in the present compositions include a mixture of a water-insoluble aluminosilicate builder such as zeolite A or of a layered silicate (SKS-6), and a water-soluble carboxylate chelating agent such as citric acid. A suitable chelant for inclusion in the detergent compositions in accordance with the invention is ethylenediamine-N,N'-disuccinic acid (EDDS) or the alkali metal, alkaline earth metal, ammonium, or substituted ammonium salts thereof, or mixtures thereof. Preferred EDDS compounds are the free acid form and the sodium or magnesium salt thereof. Examples of such preferred sodium salts of EDDS include Na₂EDDS and Na^DDS. Examples of such preferred magnesium salts of EDDS include MgEDDS and Mg₂EDDS. The magnesium salts are the most preferred for inclusion in compositions in accordance with the invention.

Preferred builder systems include a mixture of a water-insoluble aluminosilicate builder such as zeolite A, and a water soluble carboxylate chelating agent such as citric acid.

Other builder materials that can form part of the builder system for use in granular compositions include inorganic materials such as alkali metal carbonates, bicarbonates, silicates, and organic materials such as the organic phosphonates, amino polyalkylene phosphonates and amino polycarboxylates.

Other suitable water-soluble organic salts are the homo- or co-polymeric acids or their salts, in which the polycarboxylic acid comprises at least two carboxyl radicals separated form each other by not more than two carbon atoms.

Polymers of this type are disclosed in GB-A-1 ,596,756. Examples of such salts are polyacrylates of MW 2000-5000 and their copolymers with maleic anhydride, such copolymers having a molecular weight of from 20,000 to 70,000, especially about 40,000.

Detergency builder salts are normally included in amounts of from 5% to 80% by weight of the composition. Preferred levels of builder for liquid detergents are from 5% to 30%. Enzymes

Preferred detergent compositions, in addition to the enzyme of the invention, comprise other enzyme(s) which provides cleaning performance and/or fabric care benefits. Such enzymes include proteases, lipases, cutinases, amylases, cellulases, peroxidases, oxidases (e.g. laccases).

Proteases: Any protease suitable for use in alkaline solutions can be used. Suitable proteases include those of animal, vegetable or microbial origin. Microbial origin is preferred. Chemically or genetically modified mutants are included. The protease may be a serine protease, preferably an alkaline microbial protease or a trypsin-like protease. Examples of alkaline proteases are subtilisins, especially those derived from Bacillus, e.g., subtilisin Novo, subtilisin Carlsberg, subtilisin 309, subtilisin 147 and subtifisin 168 (described in WO 89/06279). Examples of trypsin-like proteases are trypsin (e.g. of porcine or bovine origin) and the Fusarium protease described in WO 89/06270. Preferred commercially available protease enzymes include those sold under the tradenames Alcalase, Savinase, Primase, Durazym, and Esperase by Novo Nordisk A/S (Denmark), those sold under the tradename Maxatase, Maxacal, Maxapem and Properase by Gist- Brocades/Genencor, those sold under the tradename Purafect and Purafect OXP by Genencor International, and those sold under the tradename Opticlean and Optimase by Solvay Enzymes. Protease enzymes may be incorporated into the compositions in accordance with the invention at a level of from 0.0001 % to 2% of enzyme protein by weight of the composition, in particular at a level of from 0.001 % to 0.1 % of enzyme protein by weight of the composition.

Lipases: Any lipase suitable for use in alkaline solutions can be used. Suitable lipases include those of bacterial or fungal origin and chemically or genetically modified lipase mutants.

Examples of useful lipases include a Humicola lanuginosa lipase, e.g., as described in EP 258 068 and EP 305 216, and mutants thereof as described in WO 92/05249, WO 94/25577 and WO 95/22615 a Rhizomucor miehei lipase, e.g., as described in EP 238 023, a Candida lipase, such as a C. antarctica lipase, e.g., the C. antarctica lipase A or B described in EP 214 761 , a Pseudomonas lipase such as a P. alcaligenes and P. pseudoalcaligenes lipase, e.g., as described in EP 218 272, or any mutant of said Pseudomonas lipases, a P. cepacia lipase, e.g., as described in EP 331 376, a P. stutzeri lipase, e.g., as disclosed in BP 1,372,034, a P. fluorescens lipase, a Bacillus lipase. e.g., a B. subtilis lipase (Dartois et al., (1993), Biochemica et Biophysica acta 1131, 253-260), a B. stearothermophilus lipase (JP 64/744992) and a B. pumilus lipase (WO 91/16422).

Furthermore, a number of cloned lipases may be useful, including the Penicillium camembertii lipase described by Yamaguchi et al., (1991), Gene 103, 61-67), the

Geotricum candidum lipase (Schimada, Y. et al., (1989), J. Biochem., 106, 383-388), and various Rhizopus lipases such as a R. delemar lipase (Hass, M.J et al., (1991), Gene

109, 117-113), a R. niveus lipase (Kugimiya et al., (1992), Biosci. Biotech. Biochem.

56, 716-719) and a R. oryzae lipase.

Other types of lipolytic enzymes such as cutinases may also be useful, e.g. , a cutinase derived from Pseudomonas mendocina as described in WO 88/09367, or a cutinase derived from Fusarium solani pisi (e.g. described in WO 90/09446). Especially suitable lipases are lipases such as Ml Lipase™, Luma fast™ and Lipomax™ (Gist-Brocades/Genencor), Lipolase™ and Lipolase Ultra™ (Novo Nordisk A/S), and Lipase P "Amano" (Amano Pharmaceutical Co. Ltd.).

The lipases are normally incorporated in the detergent composition at a level of from 0.0001 % to 2% of enzyme protein by weight of the detergent composition, in particular at a level of from 0.001 % to 0.1 % of enzyme protein by weight of the composition.

Amylases: Any amylase (a and/or b) suitable for use in alkaline solutions can be used. Suitable amylases include those of bacterial or fungal origin. Chemically or genetically modified mutants are included. Amylases include, for example, a-amylases obtained from a special strain of B. licheniformis. described in more detail in GB 1,296,839. Commercially available amylases are Duramyl™, Termamyl™, Fungamyl™ and BAN™ (available from Novo Nordisk A/S) and Rapidase™ and Maxamyl P™ (available from (Gist-Brocades/Genencor) . The amylases are normally incoφorated in the detergent composition at a level of from 0.0001 % to 2% of enzyme protein by weight of the detergent composition, in particular at a level of from 0.001 % to 0.1 % of enzyme protein by weight of the composition.

Cellulases: Any cellulase suitable for use in alkaline solutions can be used. Suitable cellulases include those of bacterial or fungal origin. Chemically or genetically modified mutants are included. Suitable cellulases are disclosed in US 4,435,307, which discloses fungal cellulases produced from Humicola insolens. Especially suitable cellulases are the cellulases having color care benefits. Examples of such cellulases are cellulases described in published European patent application No. 0495257. Commercially available cellulases is Celluzyme^™ produced by a strain of Humicola insolens. (Novo Nordisk A/S), and

KAC-500(B^)™(Kao Coφoration).

Said cellulases are normally incoφorated in the detergent composition at a level of from 0.0001 % to 2% of enzyme protein by weight of the detergent composition, in particular at a level of from 0.001 % to 0.1 % of enzyme protein by weight of the composition. Peroxidases/Oxidases: Peroxidase and/or oxidase enzymes are used in combination with hydrogen peroxide or oxygen sources, e.g., percarbonate, perborate, persulfate, hydrogen peroxide, oxygen, etc. They are used for "Solution bleaching", i.e. to prevent transfer of a textile dye from a dyed fabric to another fabric when said fabrics are washed together in a wash liquor, preferably together with an enhancing agent as described in e.g. WO 94/12621 and WO 95/01426. Suitable peroxidases/oxidases include those of plant, bacterial or fungal origin. Chemically or genetically modified mutants are included.

Said peroxidase and/or oxidase enzymes are normally incoφorated in the detergent composition at a level of from 0.0001 % to 2% of enzyme protein by weight of the detergent composition, in particular at a level of from 0.001 % to 0.1 % of enzyme protein by weight of the composition.

Mixtures of the above mentioned enzymes are encompassed herein, in particular a mixture of a protease, an amylase, a lipase and/or a cellulase.

Optional detergent ingredients

Bleaching agents: Additional optional detergent ingredients that can be included in the detergent compositions of the present invention include bleaching agents such as PB1, PB4 and percarbonate with a particle size of 400-800 microns. These bleaching agent components can include one or more oxygen bleaching agents and, depending upon the bleaching agent chosen, one or more bleach activators. When present oxygen bleaching compounds will typically be present at levels of from about 1 % to about 25 % .

The bleaching agent component for use herein can be any of the bleaching agents useful for detergent compositions including oxygen bleaches as well as others known in the art. The bleaching agent suitable for the present invention can be an activated or non-activated bleaching agent. One category of oxygen bleaching agent that can be used encompasses percarboxylic acid bleaching agents and salts thereof. Suitable examples of this class of agents include magnesium monoperoxyphthalate hexahydrate, the magnesium salt of meta-chloro perbenzoic acid, 4-nonylamino-4-oxoperoxybutyric acid and diperoxydodecanedioic acid. Such bleaching agents are disclosed in US 4,483,781, US 740,446, EP 0 133 354 and US 4,412,934. Highly preferred bleaching agents also include 6-nonylamino-6- oxoperoxycaproic acid as described in US 4,634,551.

Another category of bleaching agents that can be used encompasses the halogen bleaching agents. Examples of hypohalite bleaching agents, for example, include trichloro isocyanuric acid and the sodium and potassium dichloroisocyanurates and N-chloro and N-bromo alkane sulphonamides. Such materials are normally added at 0.5-10% by weight of the finished product, preferably 1-5% by weight.

The hydrogen peroxide releasing agents can be used in combination with bleach activators such as tetraacetylethylenediamine (TAED), nonanoyloxybenzenesulfonate (NOBS, described in US 4,412,934), 3,5-trimethylhexsanoloxybenzenesulfonate (ISONOBS, described in EP 120 591) or pentaacetylglucose (PAG), which are perhydrolyzed to form a peracid as the active bleaching species, leading to improved bleaching effect. In addition, very suitable are the bleach activators C8(6-octanamido-caproyl) oxybenzenesulfonate, C9(6-nonanamido caproyl) oxybenzenesulfonate and C10 (6-decanamido caproyl) oxybenzenesulfonate or mixtures thereof. Also suitable activators are acylated citrate esters such as disclosed in European Patent Application No. 91870207.7. Useful bleaching agents, including peroxyacids and bleaching systems comprising bleach activators and peroxygen bleaching compounds for use in cleaning compositions according to the invention are described in application USSN 08/136,626.

Imine quaternary salts may used as a bleach catalyst together with a peroxygen compound as described in WO 95/13352.

The hydrogen peroxide may also be present by adding an enzymatic system (i.e. an enzyme and a substrate therefore) which is capable of generation hydrogen peroxide at the beginning or during the washing and/or rinsing process. Such enzymatic systems are disclosed in published EP Patent Application No 0537381.

The release of peracid from a peroxygen bleach source may be activated by use of a lipase of the invention. The necessary components for the enzymatic hydrolysis system is the peracid precursor substrate: a diacyl peroxide R₁-CO-O-O-CO-R, where R and R₁ may be saturated or unsaturated alkyl, an aryl group or an alkaryl. The lipase reacts with the substrate and releases peracids in the wash.

A non-aqeous liquid detergent composition may comprise a peroxyacid material e.g peroxyacids consisting of N,N'-Di(4-Percarboxybenzoyl)ethylenediamine (PCBED), N,N'-Terephthaloyl-di(6-aminopercarboxycaproic acid) (TPCAP), N,N'-Di(4-percarboxybenzoyl)piperazine (PCBPIP), N,N'-Di(4-Percarboxybenzoyl)-1,4-diaminocyclohexane (PCBHEX), N,N'-Di(4-Percarboxybenzoyl)-1,4.butanediamine (PCBBD), N,N'-Di(4-Percarboxyaniline)-terephtalate (DPCAT), N,N,N'N'-1,2,4,5-tetra-carboxybenzoyl-di(6-aminopercarboxycaproic acid) (DiPAP), N,N'-Di(percarboxyadipoyl)phenylenediamine (DPAPD), N,N'-Succinoyl-di(4-percarboxy)aniline (SDPCA), C₃ analogue of N,N'-Terephaloyl-di-(8-amino peroxyoctanoic acid) (TPOCT) as described in WO 95/06104.

Bleaching agents other than oxygen bleaching agents are also known in the art and can be utilized herein. One type of non-oxygen bleaching agent of particular interest includes photoactivated bleaching agents such as the sulfonated zinc and/or aluminum phthalocyanines. These materials can be deposited upon the substrate during the washing process. Upon irradiation with light, in the presence of oxygen, such as by hanging clothes out to dry in the daylight, the sulfonated zinc phthalocynaine is activated and, consequently, the substrate is bleached. Preferred zinc phthalocyanine and a photoactivated bleaching process are described in US 4,033,718. Typically, detergent composition will contain about 0.025% to about 1.25%, by weight, of sulfonated zinc phthalocyanine.

Bleaching agents may also comprise a manganese catalyst. The manganese catalyst may, e.g. , be one of the compounds described in "Efficient manganese catalysts for low-temperature bleaching", Nature 369. 1994, pp. 637-639.

Suds suppressors: Another optional ingredient is a suds suppressor, exemplified by silicones, and silica-silicone mixtures. Silicones can be generally represented by alkylated polysiloxane materials while silica is normally used in finely divided forms exemplified by silica aerogels and xerogels and hydrophobic silicas of various types. Theses materials can be incoφorated as particulates in which the suds suppressor is advantageously releasably incoφorated in a water-soluble or waterdispersible, substantially non surface-active detergent impermeable carrier. Alternatively the suds suppressor can be dissolved or dispersed in a liquid carrier and applied by spraying on to one or more of the other components.

A preferred silicone suds controlling agent is disclosed in US 3,933,672. Other particularly useful suds suppressors are the self-emulsifying silicone suds suppressors, described in DE 2,646,126. An example of such a compound is DC-544, commercially available form Dow Coming, which is a siloxane-glycol copolymer. Especially preferred suds controlling agent are the suds suppressor system comprising a mixture of sUicone oils and 2-alkyl-alkanols. Suitable 2-alkyl-alkanols are 2-butyl-octanol which are commercially available under the trade name Isofol 12 R.

Such suds suppressor system are described in published European Patent Application No. 0593841. Especially preferred silicone suds controlling agents are described in published European Patent Application No. 0573699. Said compositions can comprise a silicone/ silica mixture in combination with fumed nonporous silica such as Aerosil^R.

The suds suppressors described above are normally employed at levels of from 0.001 % to 2% by weight of the composition, preferably from 0.01 % to 1 % by weight.

Other components: Other components used in detergent compositions may be employed such as soil-suspending agents, soil-releasing agents, optical brighteners, abrasives, bactericides, tarnish inhibitors, coloring agents, and/or encapsulated or nonencapsulated perfumes.

Especially suitable encapsulating materials are water soluble capsules which consist of a matrix of polysaccharide and polyhydroxy compounds such as described in GB 1,464,616.

Other suitable water soluble encapsulating materials comprise dextrins derived from ungelatinized starch acid esters of substituted dicarboxylic acids such as described in US 3,455,838. These acid-ester dextrins are, preferably, prepared from such starches as waxy maize, waxy sorghum, sago, tapioca and potato. Suitable examples of said encapsulation materials include N-Lok manufactured by National Starch. The N-Lok encapsulating material consists of a modified maize starch and glucose. The starch is modified by adding monofunctional substituted groups such as octenyl succinic acid anhydride.

Antiredeposition and soil suspension agents suitable herein include cellulose derivatives such as methylcellulose, carboxymethylcellulose and hydroxyethylcellulose, and homo- or co-polymeric polycarboxylic acids or their salts. Polymers of this type include the polyacrylates and maleic anhydride-acrylic acid copolymers, e.g Sokalan CP5, previously mentioned as builders, as well as copolymers of maleic anhydride with ethylene, methylvinyl ether or methacrylic acid, the maleic anhydride constituting at least 20 mole percent of the copolymer. These materials are normally used at levels of from 0.5 % to 10% by weight, more preferably form 0.75% to 8%, most preferably from 1 % to 6% by weight of the composition.

Preferred optical brighteners are anionic in character, examples of which are disodium 4,4'-bis-(2-diethanolamino-4-anilino -s- triazin-6-ylamino)stilbene-2:2' disulphonate, disodium 4, - 4'-bis-(2-morpholino-4-anilino-s-triazin-6-ylamino-stilbene-2:2' - disulphonate, disodium 4,4' - bis-(2,4-dianilino-s-triazin-6-ylamino)stilbene-2:2' - disulphonate, monosodium 4',4" - bis-(2,4-dianilino-s-tri-azin-6 ylamino)stilbene-2-sulphonate, disodium 4,4' -bis-(2-anilino-4-(N-methyl-N-2-hydroxyethylamino)-s-triazin-6-ylamino)stilbene-2,2' - disulphonate, di-sodium 4,4' -bis-(4-phenyl-2,1,3-triazol-2-yl)stilbene-2,2' disulphonate, di-so-dium 4,4'bis(2-anilino-4-(1-methyl-2-hydroxyethylamino)-s-triazin-6-ylami-no)stilbene-2,2'disulphonate, sodium 2(stilbyl-4"-(naphtho-1',2':4,5)-1,2,3, - triazole-2"-sulphonate and 4,4'-bis(2-sulphostyryl)biphenyl.

Other useful polymeric materials are the polyethylene glycols, particularly those of molecular weight 1000-10000, more particularly 2000 to 8000 and most preferably about 4000. These are used at levels of from 0.20% to 5% more preferably from 0.25% to 2.5% by weight. These polymers and the previously mentioned homo- or co-polymeric polycarboxylate salts are valuable for improving whiteness maintenance, fabric ash deposition, and cleaning performance on clay, proteinaceous and oxidizable soils in the presence of transition metal impurities.

A graft polymer as described in WO 95/22593 may also be used. Soil release agents useful in compositions of the present invention are conventionally copolymers or terpolymers of terephthalic acid with ethylene glycol and/or propylene glycol units in various arrangements. Examples of such polymers are disclosed in US 4,116,885, US 4,711,730 and EP 0 272 033. A particular preferred polymer in accordance with EP 0 272 033 has the formula:

(CH₃(TEG)₄₃)_0.75(POH)_0.25[Γ-PO)_2.8(T-PEG)_0.4]T(POH)_0.25((PEG)₄₃CH₃)_0.75 where PEG is -(OC₂H₄)O-, PO is (OC₃H₆O) and T is (pcOC₆H₄CO).

Also very useful are modified polyesters as random copolymers of dimethyl terephthalate, dimethyl sulfoisophthalate, ethylene glycol and 1-2 propane diol, the end groups consisting primarily of sulphobenzoate and secondarily of mono esters of ethylene glycol and/or propane-diol. The target is to obtain a polymer capped at both end by sulphobenzoate groups, "primarily^,,, in the present context most of said copolymers herein will be endcapped by sulphobenzoate groups. However, some copolymers will be less than fully capped, and therefore their end groups may consist of monoester of ethylene glycol and/or propane 1-2 diol, thereof consist "secondarily" of such species.

The selected polyesters herein contain about 46% by weight of dimethyl terephthalic acid, about 16% by weight of propane -1.2 diol, about 10% by weight ethylene gluycol about 13% by weight of dimethyl sulfobenzoic acid and about 15% by weight of sulfoisophthalic acid, and have a molecular weight of about 3.000. The polyesters and their method of preparation are described in detail in EP 311 342.

Softening agents: Fabric softening agents can also be incoφorated into laundry detergent compositions in accordance with the present invention. These agents may be inorganic or organic in type. Inorganic softening agents are exemplified by the smectite clays disclosed in GB-A-1 400898 and in US 5,019,292. Organic fabric softening agents include the water insoluble tertiary amines as disclosed in GB-A1 514 276 and EP 0 011 340 and their combination with mono C₁₂-C₁₄ quaternary ammonium salts are disclosed in EP 026 528 and di-long-chain amides as disclosed in EP 0 242 919. Other useful organic ingredients of fabric softening systems include high molecular weight polyethylene oxide materials as disclosed in EP 0 299 575 and 0 313 146.

Levels of smectite clay are normally in the range form 5% to 15%, more preferably form 8% to 12% by weight, with the material being added as a dry mixed component to the remainder of the formulation. Organic fabric softening agents such as the water-insoluble tertiary amines or dilong chain amide materials are incorporated at levels of from 0.5% to

5% by weight, normally from 1 % to 3% by weight whilst the high molecular weight polyethylene oxide materials and the water soluble cationic materials are added at levels of from 0.1 % to 2%, normally from 0.15% to 1.5% by weight. These materials are normally added to the spray dried portion of the composition, although in some instances it may be more convenient to add them as a dry mixed paniculate, or spray them as molten liquid on to other solid components of the composition.

Polymeric dye transfer inhibiting agents: The detergent compositions according to the present invention may also comprise from 0.001 % to 10%, preferably from 0.01 % to 2%, more preferably form 0.05% to 1 % by weight of polymeric dye transfer inhibiting agents. Said polymeric dye transfer inhibiting agents are normally incorporated into detergent compositions in order to inhibit the transfer of dyes from colored fabrics onto fabrics washed therewith. These polymers have the ability to complex or adsorb the fugitive dyes washed out of dyed fabrics before the dyes have the opportunity to become attached to other articles in the wash. Especially suitable polymeric dye transfer inhibiting agents are polyamine N-oxide polymers, copolymers of N-vinylpyrrolidone and N-vinylimidazole, polyvinylpyrrolidone polymers, polyvinyloxazolidones and polyvinylimidazoles or mixtures thereof. Addition of such polymers also enhances the performance of the enzymes according the invention. The detergent composition according to the invention can be in liquid, paste, gels, bars or granular forms. Non-dusting granulates may be produced, e.g., as disclosed in US 4,106,991 and 4,661,452 (both to Novo Industri A/S) and may optionally be coated by methods known in the art. Examples of waxy coating materials are poly(ethylene oxide) products (polyethyleneglycol, PEG) with mean molecular weights of 1000 to 20000; ethoxylated nonylphenols having from 16 to 50 ethylene oxide units; ethoxylated fatty alcohols in which the alcohol contains from 12 to 20 carbon atoms and in which there are 15 to 80 ethylene oxide units; fatty alcohols; fatty acids; and mono- and di- and triglycerides of fatty acids. Examples of film-forming coating materials suitable for application by fluid bed techniques are given in GB 1483591.

Granular compositions according to the present invention can also be in "compact form", i.e. they may have a relatively higher density than conventional granular detergents, i.e. form 550 to 950 g/l; in such case, the granular detergent compositions according to the present invention will contain a lower amount of "Inorganic filler salt", compared to conventional granular detergents; typical filler salts are alkaline earth metal salts of sulphates and chlorides, typically sodium sulphate; "Compact" detergent typically comprise not more than 10% filler salt. The liquid compositions according to the present invention can also be in "concentrated form", in such case, the liquid detergent compositions according to the present invention will contain a lower amount of water, compared to conventional liquid detergents. Typically, the water content of the concentrated liquid detergent is less than 30%, more preferably less than 20%, most preferably less than 10% by weight of the detergent compositions.

The compositions of the invention may for example, be formulated as hand and machine laundry detergent compositions including laundry additive compositions and compositions suitable for use in the pretreatment of stained fabrics, rinse added fabric softener compositions, and compositions for use in general household hard surface cleaning operations and dishwashing operations.

Particular forms of laundry detergent compositions within the invention include: 1) A detergent composition formulated as a granulate having a bulk density of at least 600 g/l comprising

2) A detergent composition formulated as a granulate having a bulk density of at least 600 g/l comprising

3) A detergent composition formulated as a granulate having a bulk density of at least 600 g/l comprising

4) A detergent composition formulated as a granulate having a bulk density of at least 600 g/l comprising

5) An aqueous liquid detergent composition comprising

6) An aqueous structured liquid detergent composition comprising

7) A detergent composition formulated as a granulate having a bulk density of at least 600 g/l comprising

8) A detergent composition formulated as a granulate comprising

9) A detergent composition formulated as granulate

10) A detergent composition formulated as granulate

11) A detergent composition formulated as granulate

12) A detergent composition formulated as granulate

13) A detergent composition formulated as granulate

14) A detergent composition formulated as granulate

15) A detergent composition formulated as granulate

16) A detergent composition formulated as granulate

17) A detergent composition formulated as granulate

18) A detergent composition formulated as granulate

19) A detergent composition formulated as granulate

20) A detergent composition formulated as granulate

21) A detergent composition formulated as granulate

22) A detergent composition formulated as granulate

23) A detergent composition formulated as a granulate comprising

24) An aqueous liquid detergent composition comprising

25) An aqueous liquid detergent composition comprising

26) A detergent composition formulated as concentrated liquid.

27) A detergent composition formulated as concentrated liquid.

28) A detergent composition formulated as a granulate having a bulk density of at least 600 g/l comprising

29) A detergent composition formulated as granulate

30) A detergent composition formulated as granulate

The following specific compositions are meant to exemplify compositions for the present invention, but are not necessarily meant to limit or otherwise define the scope of the invention.

In the detergent compositions, the abbreviated component identifications have the following meanings:

Composition 1

A granular fabric cleaning composition in accordance with the invention may be prepared as follows:

Composition 2

A compact granular fabric cleaning composition (density 800/1) in accord with the invention may be prepared as follows:

Composition 3

Granular fabric cleaning compositions in accordance with the invention which are especially useful in the laundering of coloured fabrics were prepared as follows:

Composition 4

Granular fabric cleaning compositions in accordance with the invention which provide "Softening through the wash" capability may be prepared as follows:

Composition 5

Heavy duty liquid fabric cleaning compositions in accordance with the invention may be prepared as follows:

Composition 6

A detergent composition formulated as a granulate

Composition 7

A bleach containing detergent composition formulated as a granulate

Composition 8

A non-bleach detergent composition formulated as a granulate

Composition 9

A detergent composition formulated as a granulate

Composition 10

A detergent composition formulated as a granulate

Composition 11

A detergent composition formulated as a granulate

Composition 12

A detergent composition formulated as a granulate

Composition 13

A detergent composition formulated as a granulate

Composition 14

A detergent composition formulated as a granulate

Composition 15

A powdered detergent composition

Composition 16

An aqueous liquid washing agent

Composition 17

A liquid detergent composition

Composition 18

A detergent composition formulated as non-aqueous liquid detergent

Composition 19

A detergent composition formulated as a non aqueous liquid detergent:

Composition 20

A detergent composition formulated as aqueous liq. Detergents

Composition 21

A liquid detergent composition comprising

Composition 22

An aqueous liquid detergent composition

Dishwashing Composition

The dishwashing detergent composition comprises a surfactant which may be anionic, non- ionic, cationic, amphoteric or a mixture of these types. The detergent will contain 0-90% of non-ionic surfactant such as low- to non-foaming ethoxylated propoxylated straight-chain alcohols.

The detergent composition may contain detergent builder salts of inorganic and/or organic types. The detergent builders may be subdivided into phosphorus-containing and non-phosphorus-containing types. The detergent composition usually contains 1-90% of detergent builders.

Examples of phosphorus-containing inorganic alkaline detergent builders, when present, include the water-soluble salts especially alkali metal pyrophosphates, orthophosphates, polyphosphates, and phosphonates. Examples of non-phosphoixis-containing inorganic builders, when present, include water-soluble alkali metal carbonates, borates and silicates as well as the various types of water-insoluble crystalline or amorphous alumino silicates of which zeolites are the best-known representatives. Examples of suitable organic builders include the alkali metal, ammonium and substituted ammonium, citrates, succinates, malonates, fatty acid sulphonates, carboxymetoxy succinates, ammonium polyacetates, carboxylates, polycarboxylates, aminopolycarboxylates, polyacetyl carboxylates and polyhydroxsulphonates. Other suitable organic builders include the higher molecular weight polymers and co-polymers known to have builder properties, for example appropriate polyacrylic acid, polymaleic and polyacrylic/polymaleic acid copolymers and their salts.

The dishwashing detergent composition may contain bleaching agents of the chlorine/bromine-type or the oxygen-type. Examples of inorganic chlorine/bromine-type bleaches are lithium, sodium or calcium hypochlorite and hypobromite as well as chlorinated trisodium phosphate. Examples of organic chloirne/bromine-type bleaches are heterocyclic N-bromo and N-chloro imides such as trichloroisocyanuric, tribromoisocyanuric, dibromoisocyanuric and dichloroisocyanuric acids, and salts thereof with water-solubilizing cations such as potassium and sodium. Hydantoin compounds are also suitable.

The oxygen bleaches are preferred, for example in the form of an inorganic persalt, preferably with a bleach precursor or as a peroxy acid compound. Typical examples of suitable peroxy bleach compounds are alkali metal perborates, both tetrahydrates and monohydrates, alkali metal percarbonates, persilicates and perphosphates. Preferred activator materials are TAED and glycerol triacetate.

The dishwashing detergent composition of the invention may be stabilized using conventional stabilizing agents for the enzyme(s), e.g. a polyol such as e.g.propylene glycol, a sugar or a sugar alcohol, lactic acid, boric acid, or a boric acid derivative, e.g. an aromatic borate ester.

The dishwashing detergent composition may also comprise other enzymes, in particular an amylase, a protease and/or a cellulase. The dishwashing detergent composition of the invention may also contain other conventional detergent ingredients, e.g. deflocculant material, filler material, foam depressors, anti-corrosion agents, soil-suspending agents, sequestering agents, anti-soil redeposition agents, dehydrating agents, dyes, bactericides, fluorescers, thickeners and perfumes.

The first wash lipolytic enzyme of the invention may be incorporated in concentrations conventionally employed in detergents. It is at present contemplated that, in the detergent composition of the invention, the lipolytic enzyme may be added in an amount corresponding to 0.00001-1 mg (calculated as pure enzyme protein) of lipolytic enzyme per titer of wash liquor.

Below, specifically preferred diswashing compositions are exemplified: .

1) POWDER AUTOMATIC DISHWASHING COMPOSITION

2) POWDER AUTOMATIC DISHWASHING COMPOSITION

3) POWDER AUTOMATIC DISHWASHING COMPOSITION

4) POWDER AUTOMATIC DISHWASHING COMPOSITION

5) POWDER AUTOMATIC DISHWASHING COMPOSITION

6) POWDER AND LIQUID DISHWASHING COMPOSITION WITH CLEANING SURFACTANT SYSTEM

7) NON-AQUEOUS LIQUID AUTOMATIC DISHWASHING COMPOSITION

8) NON-AQUEOUS LIQUID DISHWASHING COMPOSITION

9) THIXOTROPIC LIQUID AUTOMATIC DISHWASHING COMPOSITION

10) LIQUID AUTOMATIC DISHWASHING COMPOSITION

11) LIQUID AUTOMATIC DISHWASHING COMPOSITION CONTAINING PROTECTED BLEACH PARTICLES

11) Automatic dishwashing compositions as described in 1), 2), 3), 4), 6) and 10), wherein perborate is replaced by percarbonate.

12) Automatic dishwashing compositions as described in 1) - 6) which additionally contain a manganese catalyst. The manganese catalyst may, e.g., be one of the compounds described in "Efficient manganese catalysts for low-temperature bleaching", Nature 269, 1994, pp. 637- 639.

Furthermore, the first wash lipolytic enzyme of the invention may be used in softening compositions:

The lipolytic enzyme of the invention may be used in fabric softeners, e.g. as described in Surfactant and Consumer Products, Ed. by J. Falbe, 1987, pp 295-296; Tenside Surfactants Detergents, 30 (1993), 6, pp 394-399; JAOCS, Vol. 61 (1984), 2, pp 367-376; EP 517 762; EP 123 400; WO 92/19714; WO 93/19147; US 5,082,578; EP 494 769; EP 544 493; EP 543 562; US 5,235,082; EP 568 297; EP 570237.

Finally the invention relates to a process for washing or cleaning different subject matters using a composition of the invention. By using said composition it is possible more effectively to remove lipid deposits from said subject matters e.g. clothes, textiles or dishes.

It is also possible to reduce the amount of lipolytic enzymes which must be present in the detergent composition to obtain the same washing performance as detergent compositions comprising the parent lipolytic enzyme.

In an embodiment of the invention the process comprises the following steps:

a) soaking the subject matter in aqueous medium,

b) contacting for a period of time the subject matter to a detergent composition comprising the modified enzyme with lipolytic activity of the invention dissolved in the aqueous medium before, during or after step a),

c) rinsing the subject matter,

d) removing the rinsing water from the subject matter.

MATERIALS AND METHODS

MATERIALS

Plasmids: pYES 2.0 (Invitrogen Corp., UK)

p960 A. oryzae expression plasmid (described in EP 305 216 from Novo Nordisk A/S) pSX581 (E. coli expression plasmid) (see figure 7)

pJSO37 (S. cerevisiae expression plasmid) (Okkels J.S., Annals of the New York Academy of

Sciences (in press 1995) (see also figure 8)

pSX167 (see figure 4)

pSX92 (WO 89/06279)

pUC19 (Yanish-Penon et al. (1985) Gene 33, 103-119)

pHD414 (Aspergillus expression vector being a derivative of the plasmid p775 described in

EP 238 023). The construction of pHD414 is further described in WO 93/11249).

PJVi245 (See Figure 9) pCaHj383 (see Figure 9) pCaHj385 (see Figure 9) pAHE2: Hobson, A. H., Buckley, C. M., Aamand, J. L., Jørgensen, S. T., Diderichsen, B., and McConnell, D. J. (1993). Activation of a bacterial lipase by its chaperone. Proc. Natl. Acad. Sci. USA, 90, p. 5682-5686).

Micro-organisms:

Saccharomyces cerevisiae YNG318: MATa Dpep4[cir⁺] ura3-52, Ieu2-D2, his 4-539 Aspergillus oryzae IFO 4177

A. oryzae JaL 125: Aspergillus oryzae IFO 4177 available from Institute for Fermention, Osaka; 17-25 Juso Hammachi 2-Chome Yodogawa-ku, Osaka, Japan, having the alkaline protease gene named "alp" (described by Murakami K et al., (1991), Agric. Biol. Chem. 55, p. 2807-2811) deleted by a one step gene replacement method (described by G.

May in "Applied Molecular Genetics of Filamentous Fungi" (1992), p. 1-25. Eds. J. R.

Kinghorn and G. Turner; Blackie Academic and Professional), using the A. oryzae pyrG gene as marker.

E. coli W3110 lacI^q (E. coli W3110 is an early isolate used as ancestral stock for the K-12 strain (Bachman, (1972), Bacteriol. Rev. 36). The W3110 stain has been made lacP in order to overproduce the Lac repressor, turning off expression from plac more completely.

E. coli SJ6: Diderichsen, B., Wedsted, U., Hedegaard, L., Jensen, B. R., Sjøholm,

C, (1990), Cloning of aldB, which encodes alpha-acetolactate decarboxylase, an exoenzyme from Bacillus brevis. J. Bacteriol., 172, p. 4315-4321).

Strain SJ1503 is E. coli JA221 containing plasmid pAHE2:

Hobson, A. H., Buckley, C. M., Aamand, J. L., Jørgensen, S. T., Diderichsen, B., and

McConnell, D. J. (1993). Activation of a bacterial lipase by its chaperone. Proc. Natl.

Acad. Sci. USA, 90, p. 5682-5686.

Donor organisms:

Hwnicola lanuginosa DSM 4109 (EP 305,216)

Hwnicola insolens DSM 1800 (WO 96/13580)

Pseudomonas cepacia SB10, DSM 3959, is described in WO 89/01032.

Enzymes:

Bovine trypsin (Boehringer Mannheim) The following lipases are variants of the Hwnicola lanuginosa DSM 4109 lipase (EP 305 216) which are either used as parent enzymes in the context of the present invention or which constitute modified enzymes according to the invention.

The following lipases are variants of the B. cepacia (formerly Pseudomonas cepacia) lipase to which an N-terminal addition has been applied in accordance with the present invention.

The following lipases are variants of the Hwnicola insolens DSM 1800 lipolytic enzyme.

Enzyme inhibitor:

Soy bean trypsin inhibitor (Boehringer Mannheim)

Media:

YPD: 10 g yeast extract, 20 g peptone, H₂O to 810 ml. Autoclaved, 90 ml 20% glucose

(sterile filtered) added.

LB-medium: 10 g Bacto-tryptone, 5 g Bacto yeast extract, 10 g NaCl in 1 litre water.

FG4 medium: 3% soy meal, 3% maltodextrin, 1% peptone, pH adjusted to 7.0 with 4 M

NaOH

Litex Agarose HSB 2000 (CAT NO: F90472)

BG-reagent: 4 mg/ml Brilliant Green (BG) dissolved in water

Substrate 1:

10 ml Olive oil (Sigma CAT NO. 0-1500)

20 ml 2% polyvinyl alcohol (PVA)

The Substrate is homogenised for 15-20 minutes.

PCS detergent

Ad 1 litre 0.1 M Tris buffer (pH 9), and dilute further with the Tris buffer to the double concentration of the desired concentration on the PCS plates.

PCS-plates

Solution for making PCS plates

2% agarose (in TRIS buffer (pH 9) 500 ml

Lipase Substrate (Sigma catalogue no. 800-1)

Brilliant Green (Merck, art. No. 1.01310)

Swatches:

3.5 × 3.5 cm and 9x9 cm cotton swatches (style #400 from TestFabrics, Inc. (New Jersey) stained with lard/sudan red

Lard: Lard coloured with 0.75 mg sudan red/gram lard.

Detergent I:

1.17 g/l LAS (Nansa 1169/P, 30% a.m.)

0.15 g/l AEO (Dobanol 25-7)

1.25 g/l Sodium triphosphate

1.00 g/l Sodium sulphate

0.45 g/l Sodium carbonate

0.15 g/l Sodium silicate

The pH adjusted to 10

Inactivated Ariel Futur (Procter and Gamble) (commercially available batch No.4279 B

23:35): The enzymes in the detergent were inactivated by heat (4 minutes at 85 °C in microoven). Water: 3.2 mM Ca²⁺⁺/Mg²⁺⁺ (5: 1)

Chameleon double-stranded, site directed mutagenesis kit (cat. no. 200509) (Stratagene, Lajolle, CA) Equipment:

473A Protein Sequencer (Applied Biosystems) Toyopearl Butyl column (XK 16/10) (Pharmacia, Sweden)

Q-Sepharose column (HPQ XK 26/10) (Pharmacia, Sweden)

MonoQ column (1 ml) (Pharmacia, Sweden)

Highperformance Q SeparoseO (Pharmacia, Sweden)

Spin100 column (Clontech Lab. Inc., CA, USA)

METHODS:

Hybridization conditions

Medium to high stringency

Presoaking in 5X SSC and prehydbridizing for 1 hour at about 40°C in a solution of 20% formamide, 5X Denhardt's solution, 50 mM sodium phosphate, pH 6.8, and 50 mg denatured sonicated calf thymus DNA, followed by hybridization in the same solution supplemented with 100 mM ATP for 18 hours at about 40°C, Mowed by a wash in 0.4X SSC at a temperature of about 45°C.

Construction of yeast expression vector

The expression plasmid pJSO37, is derived from pYES 2.0. The inducible GAL1-promoter of pYES 2.0 was replaced with the constitutively expressed TPI (triose phosphate isomerase)-promoter from Saccharomyces cerevisiae (Albert and Karwasaki, (1982), J. Mol. Appl Genet., 1, 419-434), and the URA3 promoter has been deleted. A restriction map of pJSO37 is shown in figure 8.

Method for constructing lipolytic variants

The peptide addition and/or mutations in the non-structural N-terminal and/or C-terminal end of the parent lipolytic enzyme to construct modified lipolytic enzymes of the invention were performed either by site-directed mutagenesis or by random mutagenesis.

Site-directed mutagenesis For the construction of variants of a H. lanuginosa lipolytic enzyme the commercial kit, Chameleon double-stranded, site-directed mutagenesis kit can be used according to the manufacturer's instructions.

The gene encoding the lipolytic enzyme in question is inserted into the plasmid pHD414. In accordance with the manufacturer's instructions the ScaI site of the Ampicillin gene of pHD414 is changed to a Mlu1 site by use of the following primer:

Primer 3: AGAAATCGGGTATCCTTTCAG (SEQ ID No. 6)

The pHD414 vector comprising the lipolytic gene in question is then used as a template for DNA polymerase and oligos 7258 and 7770. The desired mutation (e.g. in the N-terminal of the lipolytic gene) is introduced into the lipolytic gene in question by addition of an appropriate oligos comprising the desired mutation.

PCR reactions are performed according to the manufacturer's recomendations.

Random mutagenesis

May be performed essentially as described in WO 95/22615. More specifically, for performing random mutagenesis in short DNA stretches such as in the peptide addition, the random mutagenesis is performed by use of doped or spiked oligonucleotide probes. For larger DNA stretches PCR generated mutagenesis may be used. Low calcium filter assay

Procedure

1) Provide SC Ura- replica plates (useful for selecting strains carrying an expression vector) with a first protein binding filter (Nylon membrane) and a second low protein binding filter (Cellulose acetate) on the top.

2) Spread yeast cells containing a parent lipase gene or a mutated lipase gene on the double filter and incubate for 2 or 3 days at 30°C.

3) Keep the colonies on the top filter by transferring the topfilter to a new plate.

4) Remove the protein binding filter to an empty petri dish.

5) Pour an agarose solution comprising an olive oil emulsion (2% P.V.A.:Olive oil=3:1), Brilliant green (indicator,0.004%), 100 mM tris buffer pH9 and EGTA (final concentration

5mM) on the bottom filter so as to identify colonies expressing lipase activity in the form of blue-green spots. 6) Identify colonies found in step 5) having a reduced dependency for calcium as compared to the parent lipase.

Dobanol®25-7 filter assay:

The screening for an improved tolerance towards a detergent component is performed by use of a filter assay conesponding to that described above except for the fact that the solution defined in 5) further comprises 0.02% Dobanol®25-7 and optionally without any EGTA.

An alternative screening assay is the following:

Procedure

1) Provide SC Ura-plates (useful for selecting strains carrying an expression vector) with a protein binding filter (Cellulose acetate) on the top.

2) Spread yeast cells containing a parent lipase gene or a mutated lipase gene on the filter and incubate for 3 or 4 days at 30°C.

4) Remove the protein binding filter to a petri dish containing:

An agarose solution comprising an olive oil emulsion (2% P.V.A.:Olive oil=2:1), Brilliant green (indicator,0.004%), 100 mM tris buffer pH10 and the detergent or detergent component, e.g. PCS-plates.

5) Identify colonies expressing lipase activity in the form of blue-green spots found in step 4)

Fermentation in yeast

10 ml of SC-ura" medium are inoculated with a S. cerevisiae colony and grown at 30°C for 2 days. The resulting 10 ml culture is used for inoculating a shake flask containing 300 ml SC-ura- medium which is grown at 30°C for 3 days. The 300 ml is used for inoculation 5 litre of the following G-substrate:

400 g Amicase

6.7 g yeast extract (Difco)

12.5 g L-Leucin (Fluka)

6.7 g (NH₄)₂SO₄

10 g MgSO₄7H₂O 17 g K₂SO₄

10 ml Tracecompounds

5 ml Vitamin solution

6.7 ml H₃PO₄

25 ml 20% Pluronic (antifoam)

In a total volume of 5000 ml:

The yeast cells are fermented for 5 days at 30°C. They are given a start dosage of 100 ml

70% glucose and added 400 ml 70% glucose/day. A pH=5.0 is kept by addition of a 10%

NH₃ solution. Agitation is 300 φm for the first 22 hours followed by 900 φm for the rest of the fermentation. Air is given with 11 air/l/min for the first 22 hours followed by 1.5 1 air/1/min for the rest of the fermentation.

Trace compounds: 6.8 g of ZhCl₂, 54.0 g of FeCl₂6H₂O, 19.1 g of MnCl₂4H₂O, 2.2 g of

CuSO₄5H₂O, 2.58 g of CaCl_2, 0.62 g of H₃BO₃ , 0.024 g of (NH₄)₆Mo₇O₂₄4H₂O, 0.2 g of

KI, 100 ml of HCl (concentrated), in a total volume of 1 1.

Vitamin solution: 250 mg of Biotin. 3 g of Thiamin. 10 g of D-Calciumpanthetonate, 100 g of Myo-Inositol. 50 g of Cholinchlorid, 1.6 g of Pyridoxin, 1.2 g of Niacinamid, 0.4 g of

Folicacid, 0.4 g of Riboflavin. In a total volume of 1 litre.

Transformation of Aspergillus orvzae (general procedure)

100 ml of YPD (Sherman et al., (1981), Methods in Yeast Genetics, Cold Spring Harbor Laboratory) are inoculated with spores of A. oryzae and incubated with shaking for about 24 hours. The mycelium is harvested by filtration through miracloth and washed with 200 ml of 0.6 M MgSO₄. The mycelium is suspended in 15 ml of 1.2 M MgSO₄, 10 mM NaH₂PO₄, pH 5.8. The suspension is cooled on ice and 1 ml of buffer containing 120 mg of Novozym^® 234, batch 1687 is added. After 5 min., 1 ml of 12 mg/ml BSA (Sigma type H25) is added and incubation with gentle agitation continued for 1.5-2.5 hours at 37°C until a large number of protoplasts is visible in a sample inspected under the microscope.

The suspension is filtered through miracloth, the filtrate transfened to a sterile tube and overlayed with 5 ml of 0.6 M sorbitol, 100 mM Tris-HCl, pH 7.0. Centrifugation is performed for 15 min. at 1000 g and the protoplasts are collected from the top of the MgSO₄ cushion. 2 volumes of STC (1.2 M sorbitol, 10 mM Tris-HCl, pH 7.5, 10 mM CaCy are added to the protoplast suspension and the mixture is centrifugated for 5 min. at 1000 g. The protoplast pellet is resuspended in 3 ml of STC and repelleted. This is repeated. Finally, the protoplasts are resuspended in 0.2-1 ml of STC.

100 μl of protoplast suspension are mixed with 5-25 μg of p3SR2 (an A. nidulans amdS gene carrying plasmid described in Hynes et al., Mol. and Cel. Biol., Vol. 3, No. 8, 1430-1439, Aug. 1983) in 10 μl of STC. The mixture is left at room temperature for 25 min. 0.2 ml of 60% PEG 4000 (BDH 29576), 10 mM CaCl₂ and 10 mM Tris-HCl, pH 7.5 is added and carefully mixed (twice) and finally 0.85 ml of the same solution are added and carefully mixed. The mixture is left at room temperature for 25 min., spun at 2.500 g for 15 min. and the pellet is resuspended in 2 ml of 1.2M sorbitol. After one more sedimentation the protoplasts are spread on minimal plates (Cove, (1966), Biochem. Biophys. Acta 113, 51-56) containing 1.0 M sucrose, pH 7.0, 10 mM acetamide as nitrogen source and 20 mM CsCl to inhibit background growth. After incubation for 4-7 days at 37°C spores are picked, suspended in sterile water and spread for single colonies. This procedure is repeated and spores of a single colony after the second re-isolation are stored as a defined transformant.

Fed batch fermentation

Fed batch fermentation is performed in a medium comprising maltodextrin as a carbon source, urea as a nitrogen source and yeast extract. The fed batch fermentation was performed by inoculating a shake flask culture of A. oryzae host cells in question into a medium comprising 3.5% of the carbon source and 0.5% of the nitrogen source. After 24 hours of cultivation at pH 5.0 and 34 °C the continuous supply of additional carbon and nitrogen sources are initiated. The carbon source is kept as the limiting factor and it is secured that oxygen is present in excess. The fed batch cultivation is continued for 4 days, after which the enzymes can be re- covered by centrifugation, ultrafiltration, clear filtration and germ filtration. Further purification may be done by anionexchange chromatographic methods known in the art.

Lipase activity (LU - Lipase Units)

Lipase activity is assayed using glycerine tributyrate as a substrate and gum-arabic as an emulsifier. 1 LU (Lipase Unit) is the amount of enzyme which liberates 1 μmol titratable butyric acid per minute at 30°C, pH 7.0. The lipase activity is assayed by pH-stat using Radiometer titrator VIT90, Radiometer, Copenhagen.

Application of lard on the swatches

6 ml of stained lard heated to 70ºC are applied to the canter of each swatch. After application of the stain the swatches are heated in an oven for 25 minutes at 75ºC and stored overnight at room temperature prior to the first wash.

3-cycle wash performance

The 3-cycle wash performance of a modified lipolytic enzyme of the invention can be evaluated on the basis of the enzyme dosage in mg of protein (or LU) per litre compared to the parent lipolytic enzyme. Wash trials are carried out in 150 ml beakers placed in a thermostated water bath. The beakers are stirred with triangular magnetic rods.

The experimental conditions are as follows:

Method: 3 cycles with overnight drying between each cycle

Wash liquor: 100 ml per beaker

Swatches: 6 swatches (3.5 x 3.5 cm, stained with lard coloured with 0.75 mg sudan red/gram of lard) per beaker

Detergent: Detergent I, pH adjusted to 10.2

Enzyme cone. : 0.075, 0.188, 0.375, 0.75 and 2.5 mg of lipase protein per litre

Time: 20 minutes

Temperature: 30°C

Rinse: 15 minutes in running tap water

Drying: overnight at room temperature (-20ºC, 30-50% RH)

Evaluation: after the 3rd wash, the reflectance at 460 nm was measured.

Evaluations of wash results

Dose-response curves are compared for the modified lipolytic enzyme and the parent lipolytic enzyme. The dose-response curves is calculated by fitting the measured data to the following equation:

where DR is the effect expressed in reflectance units

C is the enzyme concentration (mg/l)

DR_max is a constant expressing the maximum effect

K is a constant; K² expresses the enzyme concentration at which half of the maximum effect is obtained.

Based on the characteristic constants DR_max and K found for each modified lipolytic enzyme as well as the parent lipolytic enzyme, improvement factors are calculated. The improvement factor, defined as f_improve = C_parent/C (II) expresses the amount of modified lipase protein needed to obtain the same effect as that obtained with 0.25 mg/l of the reference parent protein (C_parent).

Thus, the procedure for calculating the improvement factor is as follows:

1) The effect of the parent protein at 0.25 mg/l (DR_parent) was calculated by means of equation

(I);

2) the concentration of the modified lipolytic enzyme resulting in the same effect as the parent enzyme at 0.25 mg/l was calculated by means of the following equation:

3) the improvement factor was calculated by means of equation (II). 1 cycle wash performance

1 cycle wash trials are carried out in a termostated Terg-O-to-Meter (TOM).

EXAMPLES

EXAMPLE 1

Production of wildtype Humicola lanuginosa lipase in yeast

For expression Humicola lanuginosa lipase in the yeast Saccharomyces cerevisiae YNG318 the yeast expression vector pJSO37 (see figure 8) was constructed as described in the Material and Methods section above. pJSO37 comprises the DNA sequence encoding the parent lipase and includes the DNA sequences encoding the signal peptide and propeptide (see figure 1). The plasmid was transformed into the yeast by standard methods (cf. Sambrooks et al., (1989), Molecular Cloning: A Laboratory Manual, 2nd Ed., Cold Spring Harbor). The yeast was cultivated as described in the Material and Methods section above.

Purification of H. lanuginosa lipase expressed in S. cerevisiae

Ammonium acetate (92 g) was added to the fermentation broth (1400 ml) to give a 0.8 M solution of ammonium acetate. The solution was added onto a Toyopearl Butyl column (XK 16/10). The column was washed with 0.8 M ammonium acetate and the lipase eluted in H₂O at a flow rate of 5 ml/min. 10 ml fractions were collected and lipase containing fractions were pooled according to activity in the standard lipase titration assay. The lipase containing pooled according to activity in the standard lipase titration assay. The lipase containing pool were filtered and the pH was adjusted to pH 7.6 and added onto a Q-Sepharose column (HPQ XK 26/10). The column was washed with 200 ml 0.1 M Tris-HCl, pH 7.25 and the lipase was eluted in a linear gradient of 0 to 0.3 M NaCl in 400 ml of 0.1 M Tris-HCl, pH 7.25 at a flow rate of 5 ml/min. 10 ml fractions were coliected and the lipase containing fractions were pooled according to activity in the standard lipase titration assay. The lipase containing pool was diluted with H₂O and added onto a 1 ml MonoQ column at a flow rate of 1 ml/min. The column was washed with 30 ml of H₂O and the lipase was eluted in linear gradient of 0 to 0.25 M NaCl in 40 ml. The lipase was manually collected according to absoφtion at 280 nm.

N-terminal amino acid sequencing of H. lanuginosa lipase expressed in yeast

The N-terminal amino acid sequencing was conducted on the S. cerevisiae expressed lipase using the 473A Protein Sequencer according to the manufacturer's instructions.

When the N-terminal amino acid sequence of S. cerevisiae expressed lipase is compared to the N-terminal amino acid sequence of the same lipase expressed in A. oryzae (as described in EP 305 216) a difference was observed, as the major part of the S. cerevisiae expressed enzyme contains 5 amino acid residues extra (SPIRR-) at the N-terminus (see Table El) which includes the corcesponding information for the A. oryzae expressed lipase.

As can be seen from the table a major portion of the secreted lipase expressed in S. cerevisiae has been extended by the five amino acid SPIRR (from the pro-peptide). The relative amount of enzyme containing the extra amino acid residues can be established from the yields of PTH-amino acids in amino acid sequencing.

EXAMPLE 2

Removal of the SPIRR-peptide from the N-terminus of the H. lanuginosa lipase expressed in S. cerevisiae

To 4.5 mg of the above purified modified ("SPIRR" -containing) lipase expressed in S. cerevisiae (in 1.8 ml 0.05 M NH₄HCO₃) was added 50 mg bovine trypsin (sequencing grade) and the mixture was incubated for 1 hour at 37ºC. Upon incubation the tryptic digest was stopped by adding more than 50 mg soy bean trypsin inhibitor.

The removal of the N-terminal SPIRR-peptide addition was observed by N-terminal amino acid sequencing where the fraction containing SPIRR was reduced from 75 % to 13 % (See Table E2).

The mild trypsin treatment did not result in internal cleavages in the modified lipase as no internal amino acid sequences were observed by amino acid sequencing. Also the specific activity of the trypsin treated lipase was comparable to specific activity of the untreated lipase showing that the trypsin treatment did not affect enzyme activity in the standard assay (See Table E3).

EXAMPLE 3

Production of wildtype H. lanuginosa lipase in Aspergillus oryzae

Cloning of Humicola lanuginosa lipase is described in EP 305,216, which also describes expression and characterization of the lipase in Aspergillus oryzae by use of the expression plasmid p960. Said plasmid comprises the Humicola lanuginosa lipase encoding gene and the DNA sequence encoding the SPIRR peptide addition (which is a part of the propeptide coding part of the lipase gene). The expression of the wUdtype lipase in A. oryzae (strain IFO 4177) was done essentially as described in WO 95/22615 using an expression plasmid slightly modified as compared to p960 - cf WO 95/22615. Purification of wildtype H. lanuginosa lipase expressed in A. orvzae

Fermentation supernatant from Aspergillus oryzae IFO 4177 was centrifuged and cell debris discarded. The supernatant was filtered though a 0.45 m millipore filter.

Then the supernatant was precipitated with 60% saturated ammonium sulphate. The precipitate was dissolved in water and solid ammonium acetate was added to a final concentration of 0.8 M. The solution was applied onto a Butyl Toyopearl column which was preequilibrated with 0.8 M ammonium acetate. The bound enzyme was eluted with gradient using water and 50% ethanol as eluent.

Fractions containing enzyme activity are then pooled and conductance was adjusted too it is lower than 5 mSi and pΗ is adjusted to 7.5. The pools containing activity were then applied onto an anion exchange column (e.g. Highperformance Q Separose®) which had been pre-equilibrated with 25 mM Tris-acetate buffer, pH 7.5. The bound activity was eluted with linear salt gradient using same buffer and 0.5 M sodium chloride. Fractions containing high lipase activity were pooled.

EXAMPLE 4

Construction of parent Humicola lanuginosa lipase expression vector and expression in E. coli pSX92 (see figure 4) was cut with Hind III, blunt ended with Klenow polymerase and then cut with ClaI. The large fragment was isolated (A). pHLL (see EP 305,216 figure 3 and 4) (comprising the DNA sequence encoding the parent lipase) was cut with BamH1, blunt ended, and cut with XhoII. The fragment containing the mature part of the modified lipase gene was isolated (B).

A and B were ligated together with a synthetic linker (KFN 575/576) which codes for the last 5 amino acids in the subtilisin 309 signal fused to the first four amino acids of the mature lipase. The last nucleotide "A" in the upper strand changed the XhoII site in the mature lipase gene to a Bgl II site.

Synthetic linker:

KFN 575/576: 5'- CGATCGCATCGGCTGCTGAGGTCTCGCAA-3'

3-TAGCGTAGCCGACGACTCCAGAGGCTTCTAG-5'

The resulting plasmid (pSX167) comprised the DNA sequence encoding the mature lipase. pSX167 was cut with Pme I and Bam H1 and the fragment containing the subtilisin 309 signal sequence-lipase fusion and the 5S terminator was isolated (1769 bp). This fragment was ligated into Hinc D-Bam H1 cut pUC19 creating pSX578.

DNA coding for mature lipase down to Bst XI (from pSX167, 654 bp) was fused to the Achromobacter lyticus protease I signal sequence (see figure 3) from Sph I using the PCR technique "Splicing by Overlap Extension", Horton et al., (1989), Gene).

Plasmid (pSX578) (see figure 5) was cut with Sph I and Bst XI and the above mentioned PCR DNA was inserted (figure 6). The resulting plasmid pSX581 (see figure 7) was transformed into E. coli W3110 lacI^q. When grown in shake flasks for 72 hours in LB-medium containing 0.4% lactose at 30 °C the resulting strain produces non-glycosylated lipase with the same specific activity as the normal glycosylated parent lipase enzyme.

EXAMPLE 5

Construction of H. lanuginosa lipase with peptide addition in E. coli

The pSX581 plasmid (see figure 7) was digested with BglII/ΗindIII and the vector fragment was purified from an agarose gel using standard methods.

A PCR reaction was performed with the following primers using pSX581 as template: SPIRR primer: Primer 1 (SEO ID NO 3):

5'- AA CAG ATC TTG CGA GAC CTC TCT ACG TAT AGG GCT AGC GAG CGC GGC GCT GAT CG -3' (55-mer)

PCR primer: Primer 2 (SEO ID NO 4):

GTTGTGTGGAATTGTGAGCGG (21-mer)

The resulting 300 bp fragment was purified on Spin 100 columns and digested with BglII/ΗindIII and again spin 100 purified. This fragment was tigated to the above vector fragment. The resulting plasmid was named pJSO215 and used to transform E.coli W3110 lacI^q. A plasmid preparation was made from a transformant and DNA sequenced to verify the introduction of the SPIRR peptide addition.

EXAMPLE 6

Construction and expression of modified H. lanuginosa lipolytic enzyme (ΗLv9s)_ in Aspergillus oryzae JaL125

An N-terminal peptide addition was applied to the parent H. lanuginosa (DSM 4109) lipolytic enzyme having the amino acid and DNA sequence, respectively, apparent from EP 305 216, and in addition carrying the following mutations D57G, N94K, D96L, Q249R in its mature part (inserted by conventional site-directed mutagenesis) in the DNA sequence (EP 305 216). The peptide addition SPIRPRP was applied to the N-terminus of the parent enzymes as follows: Construction of pIVI220:

The plasmid was constructed using the Chamelon double stranded, site-directed mutagenesis kit from Stratagene according to the described protocol.

pHL296 was used as the plasmid template. Said plasmid contains the gene encoding the H. lanuginosa lipolytic enzyme with the above mentioned mutations (D57G,

N94K, D96L, L97M, Q249R) cloned into pHD464.

Primer no. 7258 was used as the selection primer.

7258: 5'p gaa tga ctt ggt tga cgc gtc ace agt cac 3' (SEQ ID NO. 79)

(Thus changing the Seal site found in the ampicillin resistance gene and used for cutting to a MluI site).

Primer no. 7770 was used as the selection primer.

7770: 5'p tct age cca gaa tac tgg ate aaa tc 3 ' (SEQ ID NO. 80) (Changes the Seal site found in the H. lanuginosa lipase gene without changing the amino acid sequence).

Primer no.8479 was used as the mutagenic primer.

8479: 5'p gcg tgg acg gcc ttg get age cct att cgt cct cga ccg gtc teg cag gat ctg 3 (SEQ

ID NO 81) (replacing the propeptide and the N-terminal El of the parent H. lanuginosa enzyme (SPIRRE by SPIRPRP). Construction of pIV1245:

The plasmid was constructed using the Chameleon double-stranded, site-directed mutagenesis kit from Stratagene (cat no. 200509) according to the described protocol. pIV1220 was used as the plasmid templated and primer no.7887 as the selection primer (changing the introduced Mlu1 site found in the ampicillin resistance gene and used for cutting to a Seal site). 7887: 5'p-gaa tga ctt ggt tga gta etc ace agt cac 3' (SEQ ID NO. 77).

Primer no. 8932 was used as the mutagenic primer (8932: 5'p-g aac tgg ata gga aat ttg aag ttc ctg ttg aaa gaa ata aat gac 3' (SEQ ID NO. 78) (thus changing M97 back to L97 as wildtype and still preserving the two mutations N94K and D96L)).

2. Construction of the A. oryzae expression plasmid pCaHj483 pCaHj483 is depicted in Figure 9. It is build from the following fragments :

a) The vector pToC65 (WO91/17243) cut with EcoRI and XbaI.

b) A 2.7 kb Xbal fragment from A. nidulans carrying the amdS gene (C. M. Corrick et al., (1987), Gene 53, p. 63-71). The amdS gene is used as a selective marker in fungal transformations. The amdS gene has been modified so that the BamHl site normally present in the gene is destroyed. This has been done by introducing a silent point mutation using Primer 3: AGAAATCGGGTATCCTTTCAG (SEQ ID No. 6)

c) A 0.6 kb EcoRI/BamHI fragment carrying the A. niger NA2 promoter fused to a 60bp DNA fragment of the sequence encoding the 5 ' untranslated end of the mRNA of the A. nidulans φi gene. The NA2 promoter was isolated from the plasmid pNA2 (EP 383 779) and fused to the 60 bp tpi sequence by PCR. The primer (Primer 4 SEQ ID No. 14) encoding the 60 bp tpi sequence had the following sequence : 5'-GCTCCTCATGGTGGATCCCCAGTTGTGTATATAGAGGATTGAGGAAGGAAGAG AAGTGTGGATAGAGGTAAATTGAGTTGGAAACTCCAAGCATGGCATCCTTGC - 3 '

d) A 675 bp XbaI fragment carrying the A. niger glucoamylase transcription terminator. The fragment was isolated from the plasmid pICAMG/Term (EP 238 023).

The BamHl site of fragment c) was connected to the Xbal site in front bf the transcription terminator on fragment d) via the pIC19R linker (BamHl to Xbal)

Construction of the HLv9s expression plasmid pCaHj485

The plasmid pJVi 245 was digested with BamH I and Sal I, and the resulting 904 bp fragment encoding the HLv9s lipolytic enzyme was isolated. pCaHj 483 was digested with BamH I and Sal I, and the large vector fragment (6757) was ligated to the HLv9s fragment. The ligation mixture was used to transform E. coli DH5α cells, and a transformant harbouring the expected plasmid was isolated. The plasmid was termed pCaHj485.

3. Transformation of pCaHj 485 into JaL125

Aspergillus oryzae JaL 125 is Aspergillus oryzae IFO 4177 deleted in the alkaline protease was transformed with pCaHj 485 using selection on acetamide as described in patent EP 0 531 372. Transformants were spore reisolated twice. Spores from second reisolation of each transformant were used to inoculate 200 μl YPM (1 % yeast extract, 2% peptone, 2% maltose) in 96 well microtiter dishes. The YPM cultures were grown for 4 days at 34 °C, and the higest producers were selected using a p-nitro phenylbutyrate assay:

Stock solution: 18 μl p nitro phenyl butyrate was dissolved in 1 ml isopropanol.

Working solution: 0.1 ml stock solution was mixed with 10 ml 50 mM Tris/HCl pH 7.5; 10 mM CaCl₂.

Assay: 1 μl of YPM supernatant was mixed with 200 μl of working solution in 96 well microtiterdishes, and the color development was measured at 450 nm using an ELISA reader.

One transformant was selected for tank fermentation.

4. Tank fermentation of JaL 125/pCaHj 485

The fermentation was carried out as a fed-batch fermentation using a constant medium temperature of 34°C and a start volume of 1.2 litre. The initial pH of the medium was set to 6.5. Once the pH had increased to 7.0 this value was maintained through addition of 10% H₃PO₄. The level of dissolved oxygen in the medium was controlled by varying the agitation rate and using a fixed aeration rate of 1.0 litre air per litre medium per minute. The feed addition rate was maintained at a constant level during the entire fed-batch phase.

The batch medium contained maltose syrup as carbon source, urea and yeast extract as nitrogen source and a mixture of trace metals and salts. The feed added continuously during the fed-batch phase contained maltose syrup as carbon source whereas yeast extract and urea were added in order to assure a sufficient supply of nitrogen.

5. Purification of the modified lipolytic enzyme

1) Fermentation supernatant was filtered through miliipore filter Cat. No. AP2504700 Filter type AP25. 2) Fermentation supernatant was filtered once more on through the sterile filter from Millipore membrane Type GS 0.22 micron.

3) Fermenation supematent was then adjusted to 0.8 M ammonium acetate by adding solid ammonium acetate.

4) A Hydrophobic chromatography on TSK gel Butyl-Toyopearl 650. 50 ml column was packed with the Butyl-Toyopearl matrix. The column was washed and equilibrated with 0.8 M ammonium acetate. One titer ferementation supematent adjusted with amonium acetate was then applied on the Butyl column. The column was washed with 0.8 M ammonium acetate till all unbound material was washed out. Bound material was then eluted with water and 50 % ethanol sequentially. Fractions were coUected and analyzed for lipase activity using Standard LU assay. Fractions containing lipase activity were pooled and dUuted to adjust conductivity of the pool below 4 mSi and pH to 8.5.

5) Anion exchange chromatography on High Performance Q sepharose (Pharmacia, Code No.17-1014-01). 50 ml column was packed and washed with 50 mM Borate buffer pH 8.5. Pool conatining lipase activity was then appllied on The High performance Q sepharose column. Unbound material was washed with the Borate buffer pH 8.5. Bound activity was then eluted with linear gradient using Borate buffer conatining 1 M Sodium Chloride pH 8.5.

Fractions were collected and assayed for Lipase activity. Fractions containing Lipase activity with a ratio of UV absorbence at A280and A260 more than 1.7 are pooled.

EXAMPLE 7

3-cycle wash performance of H. lanuginosa lipase with a peptide addition

The wash performance of the Hwnicola lanuginosa lipase described in EP 305 216 and variants thereof (i.e. modified lipolytic enzymes of the invention) was tested using the 3-cycle wash performance test (described in the Matertals and Methods section above) on swatches of cotton soiled with lard stained with red colour in a model wash system at 30°C, at a constant temperature for 20 minutes. The tests were performed at lipase concentrations of 0, 0.075,

0.188, 0.375, 0.750, 2.500 mg enzyme protein per litre.

4.2 g/l of a European type powder detergent composition (as described above) were used in the test. The detergent did not contain any enzymes prior to the addition of the modified lipase of the invention. The detergent was dissolved in approximately 18°dH (German Hard ness) water. The pH of the wash liquor was about 10. Six swatches were washed in 100 ml of wash liquor. Subsequent to the washing, the swatches were flushed in running tap water for 15 minutes and then air-dried overnight at room temperature.

3 wash cycles were performed with overnight drying between each wash cycle.

After the third wash cycle the performance of a modified lipase of the invention and of the parent lipase expressed in Aspergillus oryzae was assessed. This was done by calculating the improvement factor (fimprove) as described above.

The results of these tests are shown in Table E4 below.

EXAMPLE 8

One cycle wash performance of modified H. lanuginosa lipases containing an addition The one cycle wash performance test (described above in the Materials and Methods section above) was performed of Humicola lanuginosa lipase variants of Table Ml with and without the SPIRR-peptide addition in 5 g/l of enzyme inactivated Ariel™ Futur (Procter and Gamble). The tests were performed at lipase concentrations of 0, 1250 12500 LU/1.

The detergent was dissolved in approximately 18°dH (German Hardness) water. The pH of the wash liquor was about 10.3.

The amount of soxhlet extracted fatty matter removed from textile are shown in the table below. Conesponding lipase variants with and without peptide addition are listed two and two.

The above results clearly shows that the lipase variants with a peptide addition have a significantiy improved one cycle wash performance in comparison to the conesponding lipase variant without a peptide addition. EXAMPLE 9

Site-directed mutagenesis of N-terminal addition of H. lanuginosa lipase

Mutations in the Humicola lanuginosa lipase having a SPIRR N-terminal addition was performed using the method described above in the Materials and Methods section.

First the gene encoding the lipase was inserted into the plasmid pΗD414. The ScaI site of the Ampicillin gene of pHD414 was then changed to a MluI site. The unique ScaI site present in the lipase gene was then removed.

The desired mutation (i.e. SPIRPRP) was introduced in the N-terminal of the lipase gene by addition of the following oligo comprising the desired mutation:

oligo 8479 (SEQ ID NO 5):

5'- P GCG TGG ACG GCC TTG GCT AGC CCT ATT CGT CCT CGA CCG GTC TCG

CAG GAT CTG - 3'

This resulted in a H. lanuginosa lipase gene with a SPIRPRP N-terminal peptide addition. EXAMPLE 10

Construction of N-terminal additions by random mutagenesis

Random mutagenesis of the part of the DNA sequence encoding the N-terminal addition

SPIRPRP added to the first amino acid residue of the mature H. lanuginosa lipolytic ehzyme

(obtainable from DSM 4109) and containing the following further mutations in its mature part: D57G-f-N94K-fD96L+L97M+Q249R was performed. The mutations in the mature part of the parent lipolytic enzyme was performed by PCR drtven site-directed mutagenesis using the appropriate primer sequences using the procedures described in WO 95/26215 . The peptide addition SPIRPRP was applied as described in Example 9.

The nucleotide doping scheme of the SPIRPRP codons was as follows:

Oligo 1: 5'- GCG TGG ACG GCC TTG GCC 86(T/A) 66(A/ T) 58(T/A) 67(T/A)

66(T/A) 575 66(T/A) GAG GTC TCG CAG GAT CTG -3' (57-mer) (SEQ ID NO 82) the numbers referring to which of the following flasks to be used.

Flask 5: 80% A; 6,66% C; 6,66% G og 6,66 % T.

Flask 6: 80% C; 6,66% A; 6,66% G og 6,66 % T.

Flask 7: 80% G; 6,66% A; 6,66% C og 6,66 % T. Flask 8: 80% T; 6,66% A; 6,66% C og 6,66 % G.

A two step PCR reaction protocol was used: The first step with the above primer as the 5' primer and with the primer 2056 (5'gca cgt aat gtt tgt ace 3') as the 3' primer con- ducted using pHL296 as the plasmid template. The product of the first PCR round was used in a new PCR with 4699 (5'cgg tac ccg ggg ate cac 3') as the 5' primer (to introduce the BamHI site and the first part of the coding sequence) and with the PCR product as the 3' primer using the same template. The resulting product was purified on Spin 100 (from Clonetech Lab., Inc.) and cut with BamHI and PvuII. The resulting DNA fragment was purified from the agarose gel with SpinX (Costar) and ligated into the yeast expression vector pJSO37 containing the H. lanuginosa lipolytic enzyme gene from pΗL296 cloed as a BamHI-Xbal fragment cut with BamHI and PvuII. The resulting DNA was electrotransformed into DH10/DH12 E. coli cells (Gibco/BRG Lifetechnologies) using the conventional technique.

After transformation into E. coli and amplification the plasmid was purified and transformed into S. cerevisiae YNG 318. The resulting S. cerevisiae cells were screened for good performers in the alternative lipase filter assay containing detergent (3 g/l of PCS). The positives were sequenced and found to contain the peptide additions apparent from table 1 in the Materials and Methods section (identified as HLv10s1-10).

The one-cycle wash performance of each of HL10s1-6 was tested as described in the Materials and methods section above (One cycle wash performance) at a temperature 30°C and using 5 g/l of inactivated Ariel Future as detergent. The amount of fatty material removed by each of the modifed enzymes are shown below:

The tendency was that the best performers had more positive charged amino acids in the N-terminal addition.

Analogously, random mutagenesis of the N-terminal addition RPRPRPRP added to the H. lanuginosa lipase variant El*, D57G, N94K, D96L, L97M, Q249R plus other variants were performed. The nucleotide doping scheme of the RPRPRPRP codons was as follows:

Oligo 2: 5'-GTC TCT GCG TGG ACG GCC TTG GCG GCG CCA CCT CCA 67(T/A) 66(T/A) 575 66(T/A) 67(T/A) 66(T/A) 575 66(T/A) (6/7)(7/8)(C/G) 57(C/G) C57 (5/7)5(C/G) CTG TTT AAC CAG TTC AAT CTC-3' (93-mer) (SEQ ID NO 82)

Flask 5: 80% A; 6,66% C; 6,66% G og 6,66 % T.

Flask 6: 80% C; 6,66% A; 6,66% G og 6,66 % T.

Flask 7: 80% G; 6,66% A; 6,66% C og 6,66 % T.

Flask 8: 80% T; 6,66% A; 6,66% C og 6,66 % G.

APPP is added in the N-terminal of the randomly mutagenized RPRPRPRP and prior to the signal peptide in order to protect against proteolytic degradation of the N-terminal addition. This may not be required. El was deleted in order to remove one negatively charged amino acid. The amino acids in position 2 to 5 of the mature H. lanuginosa lipase sequence were also mutagenized in order to find improved mutants in this non-structural part of the lipase. Otherwise the procedure is as stated above for the random mutagenesis of SPIRPRP. The following N-terminal peptide additions were obtained:

Ala-Pro-Pro-Pro-Arg-Pro-Arg-Leu-Leu-Pro-Ile-Ser( APPPRPRLLPIS) (in addtion to the deleted E1 residue this variant carries the additional mutation D5E in its non-structural N- terminal part of the mature enzyme). Ala-Pro-Pro-Pro-Thr-Arg-Gln-Arg-Gln-Ser-Pro(APPPTRQRQSP) (in addtion to the deleted E1 residue this variant carries the additional mutations V2L, S3T and D5V in its non-structural N-terminal part of the mature enzyme).

Ala-Pro-Pro-Pro-Arg-Thr-Ile-Pro-Arg-Ser-Ser-Pro( APPPRTIPRSSP) (in addtion to the deleted E1 residue this variant carries the additional mutations V2L, S3R and D5E in its non-structural N-terminal part of the mature enzyme).

Ala-Pro-Pro-Pro-Arg-Pro-Arg-Pro-Arg-Pro-Arg-Pro (APPPRPRPRPRP) (in addtion to the deleted E1 residue this variant carries the additional mutations V2G and D5E in its non- structural N-terminal part of the mature enzyme).

Ala-Pro-Pro-Pro-Arg-Thr-Arg-Pro-Arg-Pro-Arg-Ser (APPPRTRPRPRS) (in addtion to the deleted E1 residue this variant carries the additional mutations V2GL, S3T, Q4P and D5E in its non-structural N-terminal part of the mature enzyme).

Ala-Pro-Pro-Pro-Lys-Ala-Ser-Pro-Arg-Gln-Arg-Pro (APPPKASPRQRP) (in addtion to the deleted E1 residue this variant carries the additional mutations V2GL, D5Q and L6M in its non-structural N-terminal part of the mature enzyme).

EXAMPLE 11

Construction of Ps. cepacia lipase variants comprising peptide additions

A lipase gene from Pseudomonas cepacia SB10, DSM 3959, described in WO 89/01032 (from Novo Nordisk A/S) recently reclassified as Burkholderia cepacia was cloned, and temperature-inducible expression of the lipase in Escherichia coli was obtained by use of the plasmid pAHE2. Strain SJ1503 is E. coli JA221 containing pAHE2.

To construct vectors expressing variant lipases with N-terminal extensions, use were made of two unique restriction sites present in pAHE2, a unique BstXI site approximately 9 codons into the lipase signal peptide coding sequence, and a unique MluI site approximately 7 codons downstream from the processing site, i.e. in the beginning of the sequence for the mature lipase.

PCR primers were designed to allow amplification across this region, with the primers reading upstream from the MluI site encompassing sequences encoding the N-terminal extensions. All primers had incoφorated EcoRI sites in their extreme 5' ends.

The following sequences were chosen to encode N-terminal extensions:

For PCR amplifications, primer LWN9476 was used in combination with each of primers LWN9470-LWN9475, with pAHE2 as template. Annealing temperature was 70°C, and reactions were performed in the presence of 2% DMSO; otherwise using standard conditions and Taq™ polymerase.

Amplified fragments were purified from a 2% agarose gel, digested with BstXI and MluI, ligated to the 7.1 kb BstXI-MluI fragment obtained from pAHE2, and the ligation mixture used to transform, by electroporation, E. coli SJ6 to ampicillin resistance. Transformants were plated on LB plates with ampicillin (200 mg/ml) at 30°C.

By replica plating colonies were transferred to lipase screening plates (containing, pr. litre of agar, 20 ml of Sigma Lipase Substrate (catalogue no. 800-1)) and 4 ml of a 1 % Brilliant Green (Merck, art. No. 1.01310) solution), which were incubated at 42°C. Eventually, green halos, indicating lipase activity, developed around several colonies from each transformation mixture.

Lipase positive colonies were re-isolated, plasmids extracted, and the BstXI-MluI region DNA sequenced. The following strains were kept:

SJ3606 (SJ6/pSJ3606); contains the SPIRPRP encoding addition, and has also the second codon in the native, mature enzyme changed from alanine to valine.

SJ3608 (SJ6/pSJ3608); contains a SPRP encoding addition (DNA sequence of insert TCT CCG CGC CCG. Obtained as a variant in attempts to produce a STRRPRP encoding addition.

SJ3708 (SJ6/pSJ3708); contains the SPIRR encoding addition.

SJ3717 (SJ6/pSJ3717); contains the SPIRPRP encoding addition.

SJ3718 (SJ6/pSJ3718); contains the SPIRPRP encoding addition. SJ3719 (SJ6/pSJ3719); contains the TAIRPRK encoding addition.

SJ3720 (SJ6/pSJ3720); contains the STRRPRP encoding addition.

SJ3721 (SJ6/pSJ3721); contains the GPIRPRP encoding addition. EXAMPLE 12

Shake Flask Fermentation of Ps. cepacia Lipase variants

Cultures provide in Example 11 were grown on TY-ampicillin plates (pH 7) and used to inoculate shake flasks containing 100 ml double concentrated TY-medium with ampicillin (100 mg/ml) pH 7. The inoculum was checked for lipase productivity (as described in the Materials and Methods section) by streaking on indicator plates: all cells were found to be lipase positive (plates were incubated at 30°C for 2 days, then transferred to 40°C for 1 day).

The shake flasks were incubated shaking at 275 φm at 30 °C for 6 hours until the cultures reached optical densities (578 nm) of 2.8 to 5.3. The cultures were then transferred to 40°C for another 17 hours.

Check of lipase production in a Ps. cepacia culture

The culture was harvested, centrifuged (20 minutes at 9000 φm), the supernatant discarded and the pellet re-suspended in NaCl (0.5 ml 0.9% NaCl) and sonicated (2 minutes non-stop, on ice). The sonicated pellet was used to measure Lipase units (LU) using the titration method with tributyrate as substrate at pH 7.0.

All 8 strains except 1 (SJ3720) showed lipase activity as indicated in the table below.

EXAMPLE 13

Characterization of Ps. cepacia Lipase variants

The lipases produced from the strains described In Example 11 were characterized with respect to activity in the presence of detergent, using the PCS plate screening assay One set of samples was prepared from strains SJ1503, SJ3606 and SJ3608, which had been propagated as described above, cells harvested, and lysed by sonication to liberate the lipase. 15 ml of samples, containing around 230 LU/ml, were applied in wells in screening plates either without detergent, or containing 1.5 and 3.5 grams/litre of detergent, respectively. Plates were incubated at 37°C overnight, and the diameter of the green zone formed around the wells measured. The following results were obtained:

Green zones were not observed at higher detergent concentrations. Another set of samples were prepared by plating of the strains SJ1503, SJ3708, and SJ3717-SJ3721 on cellulose acetate filters (each filter containing all 7 strains), which were placed on LB plates with ampicillin (200 mg/ml) at 37°C overnight, these plates with filters then incubated at 42°C for 5 hours, after which the filters were transferred (colony side up) to screening plates which were incubated overnight at 37°C.

Pronounced green zones developed under all colonies on the plate without detergent; SJ3720 produced a significantly smaller zone then the rest, most "likely due to reduced expression of the lipase.

Green zones were also observed under all colonies on the plate containing 1.5 gram/1 of detergent. However, the zone produced from SJ1503, producing the native, unmodified lipase, was significantly reduced as compared to the zones produced from the other strains.

On the plate containing 3.5 grams/litre detergent, no green coloration developed from SJ1503, whereas a greenish stain was still discernible from some strains expressing modified B. cepacia lipases, in particular SJ3717, SJ3718 and SJ3721.

Thus, modification of the B. cepacia lipase gene to encode N-terminal additions to the native, mature lipase, as those described above, allow the production of lipases which in the presence of detergent has an improved activity as compared to the native lipase.

EXAMPLE 14

Fermentation of SJ1503 and SJ3717 in 10 litre tanks

The method described for shake flask was used for the fermentation in 10 litre scale. The medium used was Bacto Tryptone 400g, Bacto Yeast extract 200 g, Glucose × 2 H₂O 500g, Ampicillin 1 g, Pluronic 1 ml. The pH was kept constant at pH 7.1; the temperature was 30°C for 7 hours then adjusted to 40°C. Cells were harvested after 16 hours by centrifugation and the cells were opened using a high pressure homogenizer (800 bar). Purification of B. cepacia expressed in E.coli

E.coli cells from 10 liter fermentation broth from SJ1503 and SJ3717 were centrifuged and the supernatant was discarded. Cells were opened using rannie homogenizer under pressure 800 bar. Homogenized cells were centrifuged at 350 x g for 60 minutes. Cell supernatant was decanted.

1. Salt precipitation

Activity containing supernatant was precipitated with addition of solid ammonium sulphate to saturation of 35 % at room temperature. Precipitation was allowed for 2 hour at room temperature and centrifuged at 350x g for 1 hour. Supernatant was decanted and discarded. Precipitate containing activity was dissolved in 30% ethanol to avoid hydrophobic biding of the lipase activity to insoluble material.

To get rid of insoluble material from the 30 % ethanol dissolved material , the solution was centrifuged. The lipase activity was recovered as supernatant and insoluble material was discarded. The supernatant containing activity was concentrated and dialyzed against 25 mM Tris-acetate pH 8, by ultra-filtration using Amicon membrane with cut-off of 10 kDa. The concentrated sample was then diluted five fold in order to reduce any leftover ethanol in the supernatant containing activity.

2. Hydrophobic chromatography

The above sample containing activity was adjusted to 0.8 M ammonium acetate by adding solid ammonium acetate. 50 ml Toyopearl Butyl column (Tosho Hass, Japan) was packed and equilibrated with 0.8 M ammonium acetate. The samples from above step containing lipase activity was then adjusted to 0.8 M ammonium acetate and applied on the Toyopearl Butyl column. All the activity binds to the matrix. Unbound material was washed with 0.8 M ammonium acetate till Uv absorbence of the effluent was under 0.05 at 280 nm. Bound activity was eluted with 25 mM Tris acetate buffer containing 50 % ethanol. Fractions containing lipase activity were pooled and dialyzed against 25 mM Tris acetate buffer pH 8.5.

3. Anion exchange chromatography

50 ml Column was packed with anion exchanger Highperformance Q-sepharose (Pharmacia). The column was washed and equilibrated with 25 mM Tris acetate buffer pH 8.5 The dialyzed sample was then applied on the column. Unbound activity was washed out by using the Tris buffer. Bound activity was eluted with a linear salt gradient from 0 to 0.5 M NaCl in the Tris buffer pH 8. Flow rate was 2 ml/min and total volume of the buffer used for elution was 10 column volumes. Fractions containing lipase activity were pooled and tested for performance in a PCS plate assay.

More specifically, 3 LU of each of the recovered modified lipases were added into holes of a PCS plate (cf. Example 15 hereinafter) and incubated overnight at 37°C. After 18 hours the following results were obtained:

Thus, it can be seen that the presence of a peptide addition results in a signifantly higher wash performance being obtained.

EXAMPLE 15

Construction of modified H. insolens lipolytic enzymes with an N-terminal peptide addition

The gene encoding the parent lipolytic enzyme was isolated from Humicola insolens DSM 1800 essentially as described in WO 96/13580. Three different peptide additions were applied to the N-terminus of the mature enzyme using the plasmid pIVI1303 as the plasmid template.

Construction of pIVI303 (encoding a H. insolens lipolytic enzyme variant which contains a mutation in the region 304-369 base downstream from ATG without changes in amino acid sequence and removing a possible secondary DNA structure which might otherwise have hampered the use of the chameleon double stranded kit.) The plasmid was constructed using the Chameleon double-stranded, site-directed mutagenesis kit from Stratagene (cat no. 200509) according to the described protocol. pIVI296 was used as the plasmid template and primer no 7258 as the selection primer.

7258: 5'p gaa tga ctt ggt tga cgc gtc ace agt cac 3'

Primer no 9349 was used as the mutagenic primer:

9349: 5'p gag tec cac ate cga aac ate tgg ata caa gga gta gga gga cct tac gac gcc gcg 3'

1. Variant: HILv4s containing the mutation: PPRRPR (instead of PELVAR in the native H. insolens propeptide)

Construction of pIVI335:

The plasmid was constructed by use of the Chameleon double-stranded, site- directed mutagenesis kit from Stratagene (cat no. 200509) according to the described protocol. pIVI303 was used as a plasmid template.

Primer no.7887 was used as a selection primer:

7887: :5'p-gaa tga ctt ggt tga gta etc ace agt cac 3'

(changing the introduced Mlu1 site found in the ampicillin resistance gene and used for cutting to a Seal site).

Primer no 19473 was used as a mutagenic primer:

19473: 5'p ac cat ace ccg gcc get cct cct agg cgt cct egg cag ctg gga gcc 3 2. Variant: HILvls containing the mutation SPPRRP (instead of ELVARQ in the native H. insolens propeptide)

Construction of pIVI359:

The plasmid was constructed by use of the Chameleon double-stranded, site-directed mutagenesis kit from Stratagene (cat no. 200509) according to the described protocol. pIVI303 was used as a plasmid template. Primer no.7887 (cf. above) was used as a selection primer. Primer no 21992 was used as a mutagenic primer:

21992: 5'p ac cat ace ccg gcc get cct age cct ccg egg egg ccg ctg gga gcc ate gag aac ggc 3

3. Variant: HILv2s containing the mutation SPPRP (instead of ELVARQ in the native H. insolens propeptide)

Construction of pIVI360:

The plasmid was constructed using the Chameleon double-stranded, site-directed mutage- nesis kit from Stratagene (cat no. 200509) according to the described protocol.

pIVI303 was used as a plasmid template, and primer no.7887 as a selection primer. The following primer was used as the selection primer:

5'p ac cat ace ccg gcc get cct age cct ccg egg ccg ctg gga gcc ate gag aac ggc 3 4. Variant: HILv3s containing the mutation: SPIRK (instead of ELVARQ in the native H. insolens propeptide)

Construction of pIVI361:

The plasmid was constructed using the Chameleon double-stranded, site-directed mutagenesis kit from Stratagene (cat no. 200509) according to the described protocol. pIVI303 was used as a plasmid template and primer no 7887 as a selection primer. Primer no 21994 was used as a mutagenic primer:

21994: 5'p ac cat ace ccg gcc get cct age cct ata cgt aag ctg gga gcc ate gag aac ggc 3 5. Construction of an A. oryzae expression vector

pIVI296:

pA2L79 is described in Example 2 of WO 96/13580. The plasmid contains the

H.insolens lipolytic enzyme cDNA sequence inserted into the A. oryzae expression plasmid pD414. PA2L79 was cut with the restriction enzymes HindIII and Xhol. The fragment containing the lipolytic enzyme encoding cDNA sequence (1088 bp) was purified from agarose gel. PHD414 was cut with the restriction enzymes HindIII and XhoI and the vector purified form an agarose gel. The purified vector fragment (pHD414) and the lipase containing fragment was ligated thus creating pIVI296.

Each of the above expression vectors were transformed into A. oryzae IFO 4177 by use of the general transformation method disclosed in the Materials and Methods section above. One transformant of each type was isolated as HILv1-4s, respectively. The H. insolens transformants were grown for 3 days in shake flaks at 30°C in 500 ml YPM medium (10 g/L bacto yeast extract,20 g/L bacto peptone, 20 g/L maltose).

Fermentation supematent was filtered as described for modified H. lanuginosa lipolytic enzymes.

Purification Step 1:- 1 liter of the Fermentation supematent was adjusted to pH 8 and diluted so conductance of the supematent was under 4 mSi.

Step 1: Batch treatment of the fermentation supematent on anion exchanger DEAE A50.

DEAE-Sephadex A50 from Pharmacia was washed and equilibrated with 25 mM tris acetate buffer pH 8 using Scintered glass funnel with appropriate pore size. Fermentation supematent was then applied on the DEAE Sephadex A50 using the scintered glass funnel. The Lipolytic activity from H. insolence did not bind to anion exchanger at pH 8 and collected as effluent from DEAE Sephadex A50.

Step 2 :- pH of the efflent from DEAE Sephadex was adjusted to 4.5 by adding dilute Acetic acid. Condctance was also adjusted under 4 mSi by adding water.

Cation Exchange chromatography on SP-Sepharose. 50 ml Column was packed with SP Sepaharose Fast Flow Code no 17-0729-01 Pharmacia. Column was then washed and equilibrated with 25 mM Sodium acetate buffer pH 4.5.

Sample containing Lipolytic activity adjusted to pH 4.5 and the conductance under 4 mSi was then applied on SP-Sepharose column. Unbound material was washed using 25 mM Sodium acetate buffer pH 4.5. Lipolytic activity bound to the SP-Sepharose was then eluted with linear salt gradient with 25 mM Acetate buffer pH 4.5 containing 1M Sodium Chloride. Fractions containing Lipolytic activity and ratio of the UV absorbence at A280 /A260 was higher than 1.8 were pooled. Purity of the sample was checked on SDS-PAGE. Verification of N-terminal peptide addition

The N-terminal amino acid sequence of the HILvls lipolytic enzyme was determined (i.e. the variant in which the last 5 amino acid residues in the propeptide and the first amino acid residue in the mature enzyme (ELVARQ) have been substituted with

SPPRRP).

The N-terminal amino acid sequence found was

Arg-Arg-Pro-Leu-Gly-Ala-Ile- conesponding to the last three amino acid residues in the substituted sequence and the first four amino acid residues following the substitution.

The N-terminal amino acid sequence of the HILv2s lipolytic enzyme was also determined (i.e. in the variant in which the last 5 amino acid residues in the propeptide and the first amino acid residue in the mature enzyme (ELVARQ) have been substituted with SPPRP). The N-terminal amino acid sequence found was

Arg-Pro-Leu-Gly-Ala-Ile-Glu-Asn

conesponding to the last two amino acid residues in the substituted sequence and the first six amino acid residues following the substitution.

EXAMPLE 16

Characterization of modified Humicola insolens Lipolytic enzymes

The modified lipolytic enzymes comprising peptide additions, produced by the strains HILv1s, HILv2s, HILv3s, respectively, (described in Example 21), and the wild- type strain HIL, were characterized with respect to lipase activity on PCS-plates contai- ning 0.5 g/l, 1.0 g/l and 1.5 g/l PCS-detergent.

25 μl (corresponding to 5 LU) purified modified HILvsl, HILvs2 and HILvs3 lipase, and wild-type HIL lipase were entered into holes made in the PCS-plates by a pipette (4 mm) and incubated for 3 and 6 hours, respectively.

The result of the test in displayed in the tables below:

EXAMPLE 17

Construction of modified H. lanuginosa lipolytic enzymes with a C-terminal extension

C-terminal peptide additions were applied to the H. lanuginosa lipolytic enzyme variant HLv12s containing the N-terminal peptide addition SPIRPRP and the internal mutations D57G,N94K,D96L,Q249R.

1. Variant HLv13s (HLv12s with the C-terminal peptide addition:

270R,271R,272P,stop)

Construction of plasmid pS 14- 1 :

The plasmid was constructed using the Chameleon double-stranded, site directed mutagenesis kit from Stratagene (cat no. 200509) according to the described protocol.

pIVI245 was used as the plasmid template (The construction of pIVI245 is described in Example 6) and primer no.7258 as the selection primer. 7258: 5'p gaa tga ctt ggt tga cgc gtc ace agt cac 3' (Thus changing the ScaI site found in the ampicillin resistance gene and used for cutting to a MluI site).

Primer no.20694 was used as the mutagenic primer.

20694: 5'p-gg gac atg tct teg acg ace gta gcg get ggg teg act c 3.

2. Variant HLv14s (HLv12s with the mutation: 270R,271R,stop)

Construction of plasmid pS20-2:

The plasmid was constructed using the Chameleon double-stranded, site-directed mutagenesis kit from Stratagene (cat no. 200509) according to the described protocol. pIVI245 was used as the plasmid template and primer no. 7258 as the selection primer.

7258: 5'p gaa tga ctt ggt tga cgc gtc ace agt cac 3' (Thus changing the Seal site found in the ampicillin resistance gene used for cutting to a MluI site),

Primer no. 20695 was used as the mutagenic primer:

20695: 5'p-gg gac atg tct teg gcg gta ggc gcg get ggg teg ac 3'

Production of enzyme variants

The enzymes were produced in an analogous manner to that described in Example 6 using the plasmid pToC 202 for the cotransformation step and A. oryzae JAL 125 as a host cell.

Verification of the presence of the C-terminal extension in HLv12s

A 1 mg sample of HLv12s containing the C-terminal extension Arg- Arg-Pro (RRP) was S-carboxamidomethylated using standard procedures before degradation with a lysyl-specific protease. The resulting peptides were separated using reversed phase HPLC and the collected fractions subjected to matrix assisted laser desoφtion ionization time-of-flight mass spectrometry. A fraction containing a peptide with the experimental mass of 3906.7 Da was found. This mass is within experimental error identical to the theoretical mass of the C-terminal peptide of HLv12s containing the RRP extension which is 3906.4 Da.

The amino acid sequence of the peptide in this fraction was determined to be

C-terminal extension:

Wash result: 5g/l inactivated Ariel Fumr, 20 minutes, 1 cycle TOM, 30°C, 18ºdH. The en2yme was dosed as mg Enzyme Protein per litre wash solution.

HLv13s: SPIRPR + D57G,N94K,D96L,Q249R,270R,271R,272P

HLv14s: SPIRPR + D57G,N94K,D96L,Q249R,270R,271R

EXAMPLE 18

A part of the N-terminal extension of HLv15s (HLv15s containing the N-terminal peptide addtion SPIRPR and the foll owing mutations in the mature part of the K lanuginosa lipolytic enzyme EP, D57G. N94K, D96L, L97M, Q249R) was cleaved off by prolonged incubation with Clostripain (EC 3.4.22.8; Sigma No. C-0888).

The incubation mixture contained: HLv15s (1 mg/ml) and Clostripain (20 μg/ml) in 25 mM sodium phosphate, pH 7.4 containing 2.5 mM DTT and 1 mM calcium chloride.

Before incubation with Clostripain 60% of the lipase canied an intact propeptide (N-terminal amino acid sequence SPIRPRP), while 10% had lost the first Ser-residue (N- terminal amino acid sequence PIRPRPV) and 30% the first 5 amino acid residues of the propeptide (N-terminal amino acid sequence (RPVSQDL).

Following incubation for 62 h at ambient temperature (resulting in HLv15s-C) 60% of the lipase had lost the first 4 amino acid residues of the propeptide (resulting in the fol lowing peptide extension PRPVSQ), 20% were without 5 amino acid residues (thus having the peptide extension RPVSQD) while the remaining 20% had lost 6 amino acid residues (thus having the peptide extension PVSQDL).

The propeptide processing was determined using N-terminal amino acid sequence deteimination and it should be noted that the percentages given are approximate values.

One cycle wash performance with a modified lipolytic enzvme treated with clostripain

The one cycle wash performance test (described above in Materials and Methods section above) was performed with H. lanuginosa lipase variant HLv15s treated with clostripain. Wash test was made both with the clostripain treated sample and the non clostripain treated variant. The wash test was carried out in 5 g/l enzyme inactivated Ariel Fumr (Procter and Gamble). Lard stained swatches were washed for 20 minutes at 30ºC. The tests were performed at lipase concentrations of 0, 5000 LU/l and 12500 LU/l.

The detegent was dissolved in approx. 18ºdH (German Hardness) water. The pH of the wash liquor was about 10.3. Seven swatches were washed in 1000 ml wash liquor. Subsequent to the washing, the swatches were flushed in running tap water for 15 minutes and then air-dried overnight at room temperature.

Evaluation: The reflectance of the swatches was measured at 460 nm, and the lipase performance ( R) calculated as:

The mutations of the lipases and the additions are described above.

EXAMPLE 19

Modified H. lanuginosa lipolytic enzyme containing an cysteine bridge (HLy16s)

The modified H. lanuginosa lipolytic enzyme HLv1δs contains the following mutations: N94K, D96L, E239C and Q249R and the peptide addition SCIRR.

The parent enzyme HLv16 contains the following mutations: N94K, D96L, Q249R.

HLv16s was constructed as follows:

1. Construction of N94K, D96L mutations in the wildtype H. lanuginosa lipolytic enzyme

Construction of pIV1290:

The plasmid was constructed using the Chamelon double stranded, site-directed mutagenesis kit from Stratagene according to the described protocol using the pAHL (cf Fig. 6 of WO

92/05249) as the plasmid template and primers no 7258 and 7770 as the selection primers.

7258: 5'p gaa tga ctt ggt tga cgc gtc ace agt cac 3" (Thus changing the ScaI site found in the ampicillin resistans gene to a MluI site)(ScaI has been used for cutting).

7770: Sequence: 5'p tct age cca gaa tac tgg ate aaa tc 3 (Changes the ScaI site found in the wild type H. lanuginosa lipase gene). Primer no. 8932 was used as the mutagenic primer.

8932: 5'pgaac tgg ata gga aat ttg aag ttc ctg ttg aaa gaa ata aat gac 3' (Introducing

N94K,D96L) 2. Construction of HLv16s (SCIRR, N94K.D96L, E239C, Q249R)

Construction of pIVI319:

The plasmid was constructed using the Chameleon double-stranded.site directed mutagenesis kit from Stratagene (cat no. 200509) according to the described protocol using pIYI290 as the plasmid template and primer no 7887 as the selection primer.

7887: 5'p-gaa tga ctt ggt tga gta etc ace agt cac 3 ' (changing the introduced MluI site found in the ampicillin resistans gene to a ScaI site)(MluI has been used for cutting)

Primers no 8829, 9639 and 9646 were used as mutagenic primers

8829: 5'p-ggc ggc aat aac egg ccg aac att ccg gat ate cc 3¹ (Introducing Q249R)

9639: 5'p-at ate gtg aag ata tgc ggc att gat gcc ace 3' (Introducing E239C)

9646: 5'p-cg gcc ttg get age tgt att cgt cga gag gtc 3' (Modifying the propeptide from SPIRR to SCIRR )

Production of enzvmes HLy16s and HLy16

The enzymes were produced in an analogous manner to that described in Example 6 using A. oryzae JAL 125 as a host cell. Subsequently, the one cycle wash performance of the enzymes were tested (using 5 g/l of inactivated Ariel Future as detergent and an enzymew dosage of 0.25 mg enzyme protcin/l and 1.0 mg enzyme protein/l, respectively.

It is seen that a significantly improved washing performance is obtained for HLv16s containing a cystein bridge between the peptide addition and the mature part of the enzyme.

Claims

PATENT CLAIMS

1. A modified enzyme with lipolytic activity which as compared to its parent enzyme has i) a peptide addition in its C-terminus or N-terminus or u) peptide additions in its C- terminus and its N-terminus.

2. The modified enzyme according to claim 1, which comprises a peptide addition in its N-terminus.

3. The modified enzyme according to claim 1 or 2, wherein the peptide addition is selected so as to increase the affinity of the parent enzyme towards its substrate.

4. The modified lipolytic enzyme according to any of claims 1-3, wherein the peptide addition is selected so as to confer stability to the modified lipolytic enzyme.

5. The modified lipolytic enzyme according to claim 4, wherein the peptide addition is one which is capable of forming a covalent binding to the mature part of the parent enzyme,

6. The modified enzyme according to any of claims 1-5, which comprises a cysteine resi- due in the peptide addition and a cystein residue in the mature part of the parent enzyme in such a manner that the said cystein residues together forms a cystein bridge.

7. The modified lipolytic enzyme according to claim 6, wherein the cystein residue in the mature part of the parent enzyme has been inserted or has replaced and amino acid residue of the parent enzyme.

8. The modified lipolytic enzyme according to any of claims 1-7, wherein the peptide addition is one which has a low susceptibiUty to proteolytic degradation by proteolytic enzymes of a host cell used for expressing the modified lipolytic enzyme.

9. The modified lipolytic enzyme according to claim 8, wherein the peptide addition comprises at least one proline residues, such as two or three proline residues.

10. The modified enzyme according to any of claims 1-9, wherein the peptide addition comprises at least one, such as one, two or three positive or hydrophobic amino acids residues.

11. The modified enzyme according to any of claims 1-10, wherein the length of the peptide addition is from 1 and 500 amino acids, preferably 1 to 200, more preferably 2 to 100, even more preferably 2 to 50, and most preferably between 1 and 15, such as 1 to

10 or 4 to 10 amino acids.

12. The modified enzyme according to any of claims 1-11, wherein the peptide addition is one of the following peptide additions:

13. The modified enzyme according to any of claims 1-12, which, in addition to the peptide addition, comprises a mutation in a non-structural part of the N-terminus and/or C- terminus of the parent enzyme, in particular a mutation which has resulted in the removal of at least one negatively charged amino acid residue.

14. The modified enzyme according to claim 13, wherein a negatively charged amino acid residue of said non-structural part has been deleted or replaced by a neutral or positively charged amino acid residue or by a hydrophobic amino acid residue, or wherein a neutral amino acid residue has been replaced with a positively charged amino acid residue.

15. A modified lipolytic enzyme comprising a peptide addition according to any of claims 1-14, said peptide addition having been applied by

a) subjecting a DNA sequence encoding a parent enzyme with a peptide addition to random mutagenesis in the part of the DNA sequence encoding the peptide addition and optionally a non-structural N-terminal or C-terminal part of the mature form of the parent enzyme,

b) expressing the resulting mutated DNA sequence in a suitable host cell so as to produce a modified lipolytic enzyme, and

c) screening for modified lipolytic enzymes resulting from step c) which has an improved performance as compared to the parent enzyme.

16. The modified lipolytic enzyme according to claim 14, wherein the random mutagenesis is performed so as to introduce one or more positively charged or hydrophobic amino acid residues into the peptide addition and optionally the non-structural part of the parent enzyme.

17. The modified enzyme according to any of claims 1-16 wherein the enzyme is of microbial origin.

18. The modified enzyme according to claim 17, wherein the enzyme is of bacterial, yeast or filamentous fungal origin.

19. The modified enzyme according to claim 18, wherein the enzyme is derived from Humicola sp., such from H. lanuginosa or H. insolens.

20. The modified lipolytic enzyme according to claim 19, which is derived from the H. lanuginosa strain DSM 4109 and having the amino acid sequence shown in Fig. 1.

21. The modified enzyme according to claim 20, which further comprises a mutation in a non-structural part of the C-terminus or N-terminus of the parent enzyme, preferably a mutation which has resulted in the removal of a negative charged amino acid residue.

22. The modified enzyme according to claim 21, in which the peptide addition has replaced the amino acid residue occupying position 1 in the mature parent enzyme, i.e. the E1.

23. The modified enzyme according to claim 18, wherein the enzyme is derived from Pseudomonas sp., in particular Ps. cepacia, or Ps. mendocina or Ps. alcaligenes or Ps. pseudoalcaligenes or Ps. plantarii or Ps. gladioli, or Ps. pwida, or Ps. aeruginosa, or Ps. Glumae.

24. The modified enzyme according to any of claims 1-23, wherein the parent enzyme is in a mature form.

25. The modified enzyme according to any of claims 1-24, wherein the parent enzyme is a naturally-occuring enzyme or a variant thereof.

26. The modified enzyme according to any of claims 1-25, wherein the peptide addition is different from the native pre, pro or preprosequence of the parent enzyme.

27. A DNA sequence encoding a modified enzyme exhibiting lipolytic activity according to any of claims 1-26, provided that the part of the DNA sequence encoding the peptide addition is different from the DNA sequence which is normally associated with, and encodes the proform or preproform of, the parent enzyme.

28. A recombinant vector or transformation vehicle comprising the DNA sequence according to claim 27.

29. The vector according to claims 27 and 28, which is an expression vector further comprising DNA sequences permitting expression of the enzyme.

30. A host cell harbouring a DNA sequence according to claim 27 or a vector according to claim 28 or 29.

31. The host cell according to claim 30, which is a microbial cell, such as a filamentous fungal, a yeast or a bacterial cell.

32. The host cell according to claim 31, which is a strain of a Aspergillus sp., such as A. niger, A. oryzae and A. japonicus, or a strain of Fusarium sp., such as a strain of F. oxysporwn or F. graminearwn.

33. The host cell according to claim 31, which is a cell of a gram-positive bacterial strain, e.g. of the genus Bacillus, such as B. subtilis, B. licheniformis, B. lentus, B. brevis, B. stearothermophilus, B. alkalophilus, B. amyloliquefaciens, B. coagulans, B. circulans, B. lautus, B. thuringiensis, or of the genus Streptomyces,. or a cell of a gram-negative bacterial strain, such as E.coli, or of the genus Pseudomonas.

34. The host cell according to any of claims 30-33, which has been modified so as to have a reduced production of one or more proteolytic enzymes compared to the unmodified host cell, e.g. a host cell which has been made deficient in one or more proteolytic enzymes.

35. A process for preparing a modified enzyme according to any of claims 1-25 comprising

a) cultivating a host cell according to any of claims 30-34 under conditions conducive for the production of the modified enzyme, and

b) recovering and optionally purifying the resulting enzyme.

36. The method according to claim 35, wherein the host cell, the cultivation conditions and/or recovery conditions being selected so that at least 5% of the produced modified enzyme comprises the peptide addition encoded by the peptide addition.

37. A method of improving properties, such as increasing the affinity towards a lipid substrate, of a parent lipolytic enzyme, which method comprises applying a peptide addition to the N-terminus or C-terminus of the parent enzyme in its mature form.

38. The method according to claim 37, wherein the improved properties is an improved wash performance.

39. The method according to claim 37 or 38, wherein the peptide addition is appUed to the parent enzyme by cultivating a host cell comprising a DNA sequence encoding the pre, pro or preproform of the parent lipolytic enzyme, the DNA sequence optionally being present on a vector, and recovering the resulting modified lipolytic enzyme, the host cell, cultivation conditions and/or recovery conditions being selected so that at the most a partial processing of the pre, pro or preproform of the parent enzyme has occurred resulting in that at least 5% of the produced modified enzyme molecules comprises the desired peptide addition, e.g. the entire prosequence or a substantial part thereof.

40. The method according to claim 37 or 38, wherein the peptide addition is applied to the parent enzyme by cultivation of a host cell comprising a DNA sequence according to claim 27 or a vector according to claim 28 or 29, and recovering the resulting modified lipolytic enzyme,

the host cell, cultivation conditions and/or recovery conditions being selected so that at least 5% of the produced modified enzyme comprises the peptide addition encoded by the peptide addition.

41. The method according to claim 40, wherein the host cell is of a different origin than the parent enzyme, e.g. of another genus than the one from which the parent enzyme is derived, or has another posttranslational processing machinery than the source of the parent enzyme.

42. The method according to claim 41, wherein the parent lipolytic enzyme is derived from a filamentous fungus or a bacterium and the host cell is a yeast cell.

43. The method according to claim 42, wherein the parent lipolytic enzyme is derived from a strain of a Humicola sp. , such as H. lanuginosa or from a strain of a Pseudomonas sp.

44. The method according to any of claims 39-43, wherein the host cell is a yeast cell, such as a strain of Saccharomyces sp., in particular Saccharomyces cerevisiae, or a strain of

Hansenula sp..

45. The method according to any of claims 39-44, wherein the inherent proteolytic enzyme producing capability of the host cell used for applying the peptide addition to the parent lipolytic enzyme has been reduced, e.g. by abolishing the production of one or more proteolytic enzymes by the host cell.

46. A method according to claim 37, comprising a) subjecting a DNA sequence encoding the parent lipolytic enzyme with a peptide addition, such as a DNA sequence according to any of claims 1-26, to localized random mutagenesis in the part of the DNA sequence encoding the peptide addition or a non-structural part of the C-terminal or N-terminal end of the parent enzyme,

b) expressing the mutated DNA sequence obtained in step a) in a host cell, and

47. The method according to claim 46, wherein the DNA sequence is the gene or cDNA sequence encoding the parent enzyme in its pro or prepro form.

48. The method according to any of claims 37-47, which further involves introducing a mutation in a non-structural part of the C-terminus or N-terminus of the parent enzyme in its mature form.

49. The method according to claim 48, wherein the mutation involves deleting or replacing a negatively charged amino acid residue of the non-structural part with a neutral or positively charged amino acid residue or with a hydrophobic amino acid residue, or replacing a neutral amino acid residue with a positively charged amino acid residue.

50. An enzyme composition comprising a modified enzyme with lipolytic activity according to any of claim 1-26.

51. The composition according to claim 50, which further comprise at least one enzyme selected from the group of proteases, cellulases, peroxidases, cutinases, amylases and/or lipases.

52. A detergent composition comprising an enzyme composition according to claim 50 or 51.

53. The composition according to claim 52, which contains between 0.02 and 200 mg of modified lipolytic enzyme protein/g detergent composition.

54. The composition according to any of claims 50 and 52, wherein more than 5%, preferably more than 10%, such as 25%, better 50% especially 75% of the modified lipolytic enzyme in the composition has a full length peptide addition.

55. Use of an enzyme composition according to any of claims 50-54, in detergents, such as washing powder or dishwashing compositions.