WO1999050397A2 - Immobilized nuclease from serratia marcescens - Google Patents
Immobilized nuclease from serratia marcescens Download PDFInfo
- Publication number
- WO1999050397A2 WO1999050397A2 PCT/EP1999/001872 EP9901872W WO9950397A2 WO 1999050397 A2 WO1999050397 A2 WO 1999050397A2 EP 9901872 W EP9901872 W EP 9901872W WO 9950397 A2 WO9950397 A2 WO 9950397A2
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- nuclease
- variant
- subunits
- variants
- amino acid
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N11/00—Carrier-bound or immobilised enzymes; Carrier-bound or immobilised microbial cells; Preparation thereof
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/14—Hydrolases (3)
- C12N9/16—Hydrolases (3) acting on ester bonds (3.1)
- C12N9/22—Ribonucleases RNAses, DNAses
Definitions
- the present invention relates to improvements related to immobilizing nuclease from Serratia marcescens (nuclease [S.m.]) and to active enzyme variants of nuclease [S.m.], which are not prone to dissociate into their subunits.
- Nuclease [S.m.] commercialized under the tradename BENZONASE ® acts as endonuclease for both DNA and RNA. Because its enzymatic action yields oligonucleotides which are considered as biologically inactive, this enzyme is used for digesting genetic material in biological products, used e.g. for pharmaceutical preparations. In order to separate the enzyme easily from the reaction mixture, it has been proposed to use the enzyme immobilized on a carrier. However, due to the fact that active nuclease [S.m.] is formed by two identical subunits, such subunits bleed from preparations of immobilized nuclease [S.m.]. Consequently a constant loss of activity is observed when such preparations of immobilized nuclease [S.m.] are stored.
- the problem to be solved by the present invention is to provide variants of nuclease [S.m.], which cannot dissociate into subunits and which are active against nucleic acids.
- Such enzyme variants should be useful to be immobilized on a carrier by procedures known per se.
- Experiments have shown that there is at least one area within the structure of the monomer units of nuclease [S.m.] which can be modified in a way that the resulting enzyme is active and does not dissociate into subunits. This area has been shown to be the portion of the surface where both subunits are close to each other.
- variants of nuclease [S.m.] which can be optained by amino acid substitutions in positions which form the contact area between the subunits of native nuclease [S.m.]; these variants do not dissociate into subunits.
- Object of the invention are immobilized nuclease [S.m.] obtainable by immobilizing one of said enzyme variants, which do not dissociate into subunits, onto a base support.
- Figure 1 part A shows the tertary structure of dimeric nuclease [S.m.]; a detailed presentation is shown in part B.
- Figure 2 shows the position of the links formed from Cys 140; experimental details are given in example 6.
- Figure 3 shows the effects of varying length of the linker; experimental details are given in example 6.
- SEQ.ID.NO: 1 shows the DNA sequence of the (His) 6 -Gly-Ser derivative of the enzyme variant H184R; the corresponding protein sequence (SEQ.ID.NO: 2) is presented as to start at the following Asp residue in order to keep the numbering of amino acid residues the same as in the wild-type.
- SEQ.ID.NO: 3 the wild type sequence of nuclease [S.m.] is presented along with the most preferred amino acid substitutions and along with the variant S179C.
- the (His) 6 -Gly-Ser portion is presented in this sequence as an additional feature.
- the variant H184A was generated applying the inverse PCR strategy essentially as described by E. Blum et al. (1994) J.Biochem.Biophys.Meth. 29, 113 - 121. The mutations were verified by sequencing using standard procedures (ABI 373A DNA-Sequencer (Applied Biosystems) with ABI PRISMTM reaction kit and AmpliTaqTM DNA polymerase FS). The wild type nuclease [S.m.] and the respective variant enzymes were produced as His 6 GlySer- tagged proteins in E. coli and purified as described by P. Friedhoff et al. (1994) Nucleic Acids Res. 22, 3280 - 3287, and by P. Friedhoff et al.
- Nuclease activities of the wild-type enzyme (wt) and of the different variants were determined essentially as described by P. Friedhoff et al. (1996) Eur. J. Biochem. 24_1, 572 - 580 (hyperchromicity assay; high- molecular-weight DNA from herring sperm as substrate). Specific activities and kinetic parameters are summarized in Table 2 below.
- the dimer interface of the Serratia nuclease contains a large surface area of complementary charge and shape. Together the two subunits form a single globular entity. His 184 is in a suitable distance to Pro 180, Ala 181 , Pro 182, and Asn 183 of the second subunit to form protein-protein contacts (see Figure 1 ; Table 1 ). His 184 was chosen as a prime candidate to disrupt the steric and electrostatic complementarity in the interface region as substitution of this residue promised to have a large impact on the integrity of the dimer interface. Residues were introduced that either cannot form the specific contacts to the second subunit or in addition are large and bulky and introduce additional charge.
- Solubility of the protein can further be improved by substituting one or several amino acid residues by more hydrophilic ones, e.g. by Ser; examples of suitable positions are: Arg 136, Asp 138, Asn 178, Pro 180, Ala 181 , Val 182, Asn 183, Tyr 185, Asp 225, Lys 233, Val 236, Glu 239, Leu 240, and Asn 245.
- the positions mentioned above and the position Ser 140 are among the positions which form the contact area between the subunits of native nuclease [S.m.].
- Nonbonded protein-protein contacts ( ⁇ 3.5 A)
- the S179C variant was produced that previously had been described as a monomeric variant of the nuclease [M.D. Miller & K.L. Krause (1996) Protein Science 5, 24 - 33].
- the Ser 179 to Cys exchange is interesting because it would not be expected to directly disrupt the dimer interface although this residue is located near the interface ( Figure 1 ).
- the variant S179C was only poorly expressed.
- S140C An additional variant produced was S140C.
- This variant was used for forming an obligatory dimer by linking the SH-groups of the two subunits.
- a number of ⁇ , ⁇ -bismaleimidoalkanes of different length has been prepared; the different ⁇ , ⁇ -bismaleimidoalkanes have been used to link the SH-groups of the two subunits of S140C nuclease [S.m.].
- the amino acid substitution S140C can also be used to introduce an binding group for immobilization of the monomeric His 184 variants mentioned above. Table 2
- the monomeric His 184 variants have the same nucleolytic activity (10 6 Kunits units mg "1 ) and similar k ca. - and K M -values as the wild type enzyme, whereas the S179C variant shows only residual nucleolytic activity (10 3 Kunits units mg "1 ) probably due to changes in the structure
- the variants of nuclease [S m ] according to the present invention show considerable more nucleolytic activity than the variant
- S179C typically enzyme variants according to the invention show at least about 5 to 10 percent of the nucleolytic activity of the wild type enzyme
- ⁇ -diaminoalkanes were reacted with maleic anhydride to yield N- ⁇ /s-n-maleamic acid; this product was further reacted with acetic anhydride/ sodium acetate to yield the respective ⁇ , ⁇ -bismaleimidoalkane.
- the following ⁇ , ⁇ -bismaleimidoalkanes were synthesized: bismaleimido- propane (BMP), bismaleimidobutane (BMB), bismaleimidopentane (BMPT), bismaleimidohexane (BMH), and bismaleimidoheptane (BMHP). These ⁇ , ⁇ -bismaleimidoalkanes have been used to prepare obligatory dimers of nuclease [S.m.] based on the mutant enzyme S140S mentioned above.
- base supports can be immobilized on base supports by procedures known in the art; these procedures and their variants have been described in many hand books and reviews.
- Suitable base supports are also known in the art.
- Examples of base supports are particulate or beaded supports made of polysaccharide derivatives, or of organic polymers, or of derivatized silica; also suitable are non-particulate supports like porous membranes, spongeous materials, or woven or non- woven fabrics.
- Especially useful base supports are disclosed in EP 0 565 978, WO 96/00 077, and in WO 97/02 768.
- n-butyldiamine instead of n-propyldiamine ⁇ , ⁇ -bismaleimidobutane (BMB) is prepared essentially as described in Example 1.
- n-pentyldiamine instead of n-propyldiamine ⁇ , ⁇ -bismaleimido- pentane (BMB) is prepared essentially as described in Example 1.
- n-hexyldiamine instead of ⁇ -propyldiamine ⁇ , ⁇ -bismaleimidohexane (BMH) is prepared essentially as described in Example 1.
- n-heptyldiamine instead of n-propyldiamine ⁇ , ⁇ -bismaleimido- heptane (BMB) is prepared essentially as described in Example 1.
- the water-insoluble crosslinking reagents were dissolved in dry DMSO at a concentration of 100 ⁇ M.
- the crosslinking reaction was carried out in 40 ⁇ l 30 mM Na-phosphate-buffer pH 7.0, 10 mM EDTA, 0.5 % DMSO (introduced by addition of the bismaleimidoalkane), 1 ⁇ M (based on the M r of the monomer) nuclease [S.m.] and 0.5 ⁇ M crosslinking reagent. After incubation for 15 min with frequent shaking at room temperature, the protein was precipitated by adding 10 ⁇ l 100% trichloroacetic acid and incubation on ice for 10 min.
- reaction products were carried out by polyacrylamide gel electrophoresis on 10.5 % gels in the presence of sodium dodecyl sulfate. The gels were stained with Coomassie brilliant blue. The crosslinking yield was determined by densitometry of the stained gels using a video documentation system (Intas, G ⁇ ttingen, Germany).
- nuclease [S.m.] crosslinked with BMH were produced in a two step crosslinking process: 10 mg of the freshly prepared and dialyzed (10 mM Tris-HCl pH 8.2) S140C variant were incubated in 30 mM
- This crosslinked dimer was shown to be enzymatically active.
- Figure 2 shows the structure of the dimer linked via the two S140C residues. The yield of the crosslinking reactions using linkers of different chain length is depicted in Figure 3.
Abstract
Description
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99915678A EP1070119A2 (en) | 1998-03-31 | 1999-03-22 | Immobilized nuclease from serratia marcescens |
JP2000541285A JP2002509719A (en) | 1998-03-31 | 1999-03-22 | Fixed nuclease from Serratia marcescens |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98105825.8 | 1998-03-31 | ||
EP98105825 | 1998-03-31 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1999050397A2 true WO1999050397A2 (en) | 1999-10-07 |
WO1999050397A3 WO1999050397A3 (en) | 2000-03-09 |
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Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1999/001872 WO1999050397A2 (en) | 1998-03-31 | 1999-03-22 | Immobilized nuclease from serratia marcescens |
Country Status (3)
Country | Link |
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EP (1) | EP1070119A2 (en) |
JP (1) | JP2002509719A (en) |
WO (1) | WO1999050397A2 (en) |
-
1999
- 1999-03-22 JP JP2000541285A patent/JP2002509719A/en active Pending
- 1999-03-22 EP EP99915678A patent/EP1070119A2/en not_active Withdrawn
- 1999-03-22 WO PCT/EP1999/001872 patent/WO1999050397A2/en not_active Application Discontinuation
Non-Patent Citations (6)
Title |
---|
BARTHOLEYNS, J. & MOORE, S.: "pancreatic ribonuclease: ..." SCIENCE, vol. 186, 1974, pages 444-445, XP002124932 * |
FRANKE, I. & PINGOUD, A.: "Synthesis and biochemical characterization of obligatory dimers ..." J. PROTEIN. CHEM., vol. 18, no. 1, 1999, pages 137-146, XP002124934 * |
FRANKE, I. ET AL.: "Genetic engineering, production and characterisation of monomeric variants of the dimeric Serratia marcescens endonuclease" FEBS LETTERS, vol. 425, 1998, pages 517-522, XP002124929 * |
MAINFROID, D. ET AL.: "Stabilization of human triosephosphate isomerase..." BIOCHEMISTRY, vol. 35, 1996, pages 4110-4117, XP002124931 * |
MILLER, M.D. & KRAUSE, K.L.: "Identification of the Serratia endonuclease dimer: ..." PROTEIN SCIENCE, vol. 5, 1996, pages 24-33, XP002124930 * |
TORCHILIN, V.P. & TRUBETSKOY, V.S.: "Stabilization of subunit enzymes by intramolecular crosslinking with bifunctional reagents" ANN. N. Y. ACAD. SCI., vol. 434, 1984, pages 27-30, XP002124933 * |
Also Published As
Publication number | Publication date |
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WO1999050397A3 (en) | 2000-03-09 |
JP2002509719A (en) | 2002-04-02 |
EP1070119A2 (en) | 2001-01-24 |
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