EP1297159A2 - Sequence nucleotidique codant une benzaldehyde-lyase et procede de synthese stereoselective de 2-hydroxycetones - Google Patents

Sequence nucleotidique codant une benzaldehyde-lyase et procede de synthese stereoselective de 2-hydroxycetones

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Publication number
EP1297159A2
EP1297159A2 EP01962797A EP01962797A EP1297159A2 EP 1297159 A2 EP1297159 A2 EP 1297159A2 EP 01962797 A EP01962797 A EP 01962797A EP 01962797 A EP01962797 A EP 01962797A EP 1297159 A2 EP1297159 A2 EP 1297159A2
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EP
European Patent Office
Prior art keywords
nucleotide sequence
compound
formula
benzaldehyde lyase
benzaldehyde
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01962797A
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German (de)
English (en)
Inventor
Martina Pohl
Michael Müller
Ayhan S. Demir
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Muller Michael
Forschungszentrum Juelich GmbH
Original Assignee
Muller Michael
Forschungszentrum Juelich GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Muller Michael, Forschungszentrum Juelich GmbH filed Critical Muller Michael
Publication of EP1297159A2 publication Critical patent/EP1297159A2/fr
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P41/00—Processes using enzymes or microorganisms to separate optical isomers from a racemic mixture
    • 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
    • C12N9/88—Lyases (4.)
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P17/00—Preparation of heterocyclic carbon compounds with only O, N, S, Se or Te as ring hetero atoms
    • C12P17/16—Preparation of heterocyclic carbon compounds with only O, N, S, Se or Te as ring hetero atoms containing two or more hetero rings
    • C12P17/167—Heterorings having sulfur atoms as ring heteroatoms, e.g. vitamin B1, thiamine nucleus and open chain analogs
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P7/00—Preparation of oxygen-containing organic compounds
    • C12P7/24—Preparation of oxygen-containing organic compounds containing a carbonyl group
    • C12P7/26—Ketones

Definitions

  • the present invention relates to an improved process for the stereoselective synthesis of 2-hydroxyketones using a benzaldehyde lyase.
  • a thiamine pyrophosphate (TPP) -dependent benzaldehyde lyase and genetic analyzes of the coding gene are described in Vicuna et al. (J. Bacteriol., 1989, 171: 2401-2405) and Hinrichsen, P. et al. (Gene, 1994, 144: 137-138).
  • a closer characterization of the enzyme showed that this benzaldehyde lyase has only an irreversible cleavage activity. For example, starting from benzoin, two molecules of benzaldehyde or anisoin are split into two molecules of anisaldehyde. The formation of C-C compounds catalyzed by a benzaldehyde lyase is explicitly excluded.
  • Decarboxylases or transketolases are particularly suitable for an enzyme-catalyzed synthesis of 2-hydroxyketones, which generally also have a dependency on thiamine pyrophosphate (TPP).
  • TPP thiamine pyrophosphate
  • a disadvantage of the described processes is that the pyruvate decarboxylase only accepts a very limited range of substrates.
  • a spontaneous racemization of the resulting products can occur due to an occurring keto-enol tautomerism with the consequence of a reduced enantioselectivity.
  • the object of the present invention is therefore to provide an improved enzymatic process for the preparation of 2-hydroxyketones which no longer has the disadvantages mentioned above.
  • This object is achieved by the process according to the invention for the stereoselective preparation of 2-hydroxyketones, a benzaldehyde lyase being used which, in the presence of at least one solubilizing compound, the reaction of two compounds containing aldehyde groups, at least one of which is not acetaldehyde, or of one Compound containing aldehyde groups with a compound containing 2-hydroxyketone groups while maintaining the stereochemical arrangement of the latter catalyzed another compound containing 2-hydroxyketone groups.
  • the aforementioned process is characterized in that a first compound of the general formula I containing aidehydro groups
  • R a component from the group of aliphatic, aromatic or heteroaromatic hydrocarbons, which can be mono- or polysubstituted in the ortho, meta or para position, the substituents being alkyl, aryl or aralkyl groups or heteroators, such as for example Cl, F, Br or S, P, N or combinations thereof and R ⁇ is -CH 3 ,
  • R 1 and R 2 may be the same or different and R 1 and R 2 have the same meaning as R in formula I.
  • a selection of examples of compounds of the formula I and thus of substrates of the benzaldehyde lyase used according to the invention are listed below:
  • R 2-F, 4-F, 2,4-F, 2-Br, 4-Br, 2-C1, 4-CI, 2-OCH 3l 3-OCH 3 , 4-OCH 3 , 2- OH, 2-CH's
  • benzaldehyde is used as the compound of the general formula I.
  • a preferred compound of the general formula II is the (R) -benzoin.
  • the present invention comprises a process in which compounds of the formula II in the presence of compounds of the general formula III containing aldehyde groups
  • R 3 -CH 3 or a component from the group of aliphatic, aromatic or heteroaromatic hydrocarbons which can be mono- or polysubstituted in the ortho, meta or para position, the substituents being alkyl, aryl or aralkyl- Can be groups or heteroatoms, such as Cl, F, Br or S, P, N or combinations thereof,
  • acetaldehyde is used as the compound of the general formula III.
  • a preferred compound of the general formula IV is (R) -2-hydroxy-1-phenyl-propanone ((R) -2-HPP).
  • the method according to the invention represents a combination of the two variants mentioned above, in a first Section the reaction of two compounds containing aldehyde groups to a compound containing 2-hydroxyketone groups takes place and as soon as the latter is present, the further conversion of these 2-hydroxyketones to a further compound containing 2-hydroxyketone groups takes place.
  • a summary of the course of the reaction is shown schematically below:
  • the present invention also encompasses a process in which, starting from a racemic mixture comprising compounds of the formula II, the enantiomer of the formula II is selectively reacted while maintaining the stereochemical arrangement to give a compound of the formula IV.
  • this variant is shown schematically below.
  • the arrangement of the OH group on the ⁇ -C atom to form the keto group via a serpentine line is intended to represent the presence of a racemic mixture of a compound of the formula II containing 2-hydroxyketone groups.
  • This can be, for example, a racemic mixture of (S) - and trade (R) -benoin.
  • the present invention is thus advantageously characterized in that a highly efficient enantioselective preparation of (R) -2-hydroxyketones is possible with one and the same catalyst, and also in the presence of a racemic mixture of compounds containing 2-hydroxyketone groups, for example the Formula II, a » highly efficient separation of the two enantiomers takes place.
  • the process according to the invention can be used to produce (R) -benzoin almost quantitatively from benzaldehyde on the one hand and, on the other hand, from a racemic mixture of (S) ⁇ and (R) -benzoin with a comparably high efficiency (S) -benzoin and (R) - 2-HPP can be obtained. Due to the different solubility behavior of the last two enantiomers containing 2-hydroxyketone groups, a quantitative separation of the (S) and (R) form of the racemic mixture originally used is possible.
  • Another variant of the method according to the invention is characterized in that an aldehyde group-containing compound of the general formula 1 is reacted as a first substrate with an acetaldehyde or substituted acetaldehyde as a second substrate via a compound of the formula II as an intermediate to a compound of the formula IV ,
  • the following schematic diagram should clarify this once again.
  • the term stereoscopic activity or enantioselectivity in the sense of the present invention is explained in more detail below.
  • the method according to the invention enables stereoselective Preparation of compounds containing 2-hydroxyketone groups.
  • the two possible stereoisomers (enantiomers) of the 2-hydroxyketones formed ie of the (S) - or (R) -enantiomer
  • only the (R) -enantiomer is formed according to the invention due to the benzaldehyde lyase used, ie with an enantioselectivity of almost 100%.
  • This (R) -enatiomer formed can then function in a further step of the process according to the invention as a further substrate of the benzaldehyde lyase and be converted into a further compound containing (R) -2-hydroxyketone groups.
  • an (R) -enantiomer is understood to mean a compound in which the OH group on the ⁇ -C atom to the keto group emerges from the paper plane, while the carbon atoms of the carbonyl backbone and the radicals R 1 and R 2 ( in formula II) or R 3 and R 4 (in formula IV) lie in the paper plane.
  • This definition of an (R) -enationmer according to the invention takes place without taking into account the priority of the radicals R 1 / R 2 or R 3 / R 4 , but only as a function of the position of the hydroxyl group on the ⁇ -C atom relative to the keto group. Consequently, it is possible that the (R) configuration according to the invention is not identical to the common nomenclature of the stereoisomeric compounds.
  • the term “maintaining the stereochemical arrangement” is to be understood to mean that the configuration of the OH group on the ⁇ -C atom to form the keto group emerges unchanged from the enzyme-catalyzed reaction, ie is retained.
  • the enzyme-catalyzed process according to the invention using a solvent-imparting compound starting from compounds of formula I containing aldehyde groups, proceeds almost quantitatively in the direction of a compound of formula II containing 2-hydroxyketone groups.
  • the foregoing also relates to the process variant in which those in a first Process section synthesized compounds of formula II are further converted to compounds of formula IV.
  • At least 0.5-40%, preferably 5-20%, particularly preferably 7-12% and most preferably 10% of at least one solution-mediating compound are added to the reaction mixture or the culture medium in one of the aforementioned processes according to the invention.
  • a water-miscible and / or water-soluble organic solvent and / or a solvent-free compound can be added as the solution-imparting compound.
  • water-miscible and / or water-soluble organic solvents include dimethyl sulfoxide (DMSO), dimethylformamide or ethanol.
  • DMSO dimethyl sulfoxide
  • ethanol dimethylformamide
  • Compound are cyclodextrins, for example ß-cyclodextrins (cycloheptaamylose).
  • the process according to the invention is characterized in that there is an enantiomeric excess (ee) of compound of the formula II in the range from> 96%, preferably from> 97%, particularly preferably from> 99% and in particular from 99.9%.
  • the present process is further characterized in that an enantiomeric excess (ee) of compound of the formula IV of at least 50 to 60%, preferably 60 to 90%, particularly preferably from 92 to 97% and most preferably 97 to> 99.9% is achieved.
  • ee enantiomeric excess
  • the process according to the invention is distinguished by the fact that it is carried out in a so-called “fed batch” or else in a continuous reaction procedure.
  • suitable devices for this purpose are known from the literature.
  • a conventional reaction tank is suitable Stirred kettle (fermenter) which is loaded with a suitable medium for the cultivation of cells containing a benzaldehyde lyase according to the invention by the continuous inflow of compounds of the general formula I containing aldehyde groups and optionally continuous or discontinuous metering of a solubilizing compound, the enzymatically synthesized, stereospecific product of a (R) -2-hydroxyketone group-containing compound can be continuously prepared and removed from the fermenter.
  • product yields in the range from 96-100%, preferably from 97%, particularly preferably from 99% and in particular from more than 99% can be achieved.
  • the present invention also relates to a method which is characterized in that a benzaldehyde lysis or a biologically active part thereof is encoded by a nucleotide sequence according to SEQ ID No. 1 or an allele, homolog or derivative of this nucleotide sequence or a nucleotide sequence hybridizing with this is used.
  • the present invention also includes a method in which a benzaldehyde lyase with an amino acid sequence according to SEQ ID No. 2 or a biologically active part thereof, a modified form, isoenzymes or mixtures thereof.
  • alleles are to be understood as functionally equivalent, ie essentially equivalent nucleotide sequences.
  • Functionally equivalent sequences are those sequences which, despite a different nucleotide sequence, for example due to the degeneracy of the genetic code, still have the desired functions.
  • Functional equivalents thus include naturally occurring variants of the sequences described here, as well as artificial, e.g. B. nucleotide sequences obtained by chemical synthesis and possibly adapted to the codon usage of the host organism.
  • functionally equivalent sequences include those which have a modified nucleotide sequence which gives the enzyme, for example, a desensitivity or resistance to inhibitors.
  • Functional equivalents (alleles) are also those variants whose function is weakened or enhanced compared to the starting gene or gene fragment.
  • An allele is also understood to mean, in particular, natural or artificial mutations in an originally isolated sequence which continue to show the desired function. Mutations include substitutions, additions, deletions, exchanges or insertions of one or more nucleotide residues. Also included here are so-called sense mutations, which can lead to the exchange of conserved amino acids at the protein level, but which do not lead to a fundamental change in the activity of the protein and are therefore function-neutral. This also includes changes in the nucleotide sequence that affect the N- or C-terminus of a protein at the protein level, but without significantly impairing the function of the protein. These changes can even have a stabilizing influence on the protein structure. Also included are changes that, for example, facilitate later protein purification, e.g. a so-called "His tag" consisting of several successive histidine residues.
  • the present invention also encompasses, for example, nucleotide sequences which are obtained by modification of the nucleotide sequence, resulting in corresponding derivatives.
  • the aim of such a modification can e.g. B. the further limitation of the coding sequence contained therein or the insertion of further Detection interfaces for restriction enzymes or the incorporation of rare nucleotides.
  • Such artificial DNA sequences can be, for example, back-translated by means of computer-aided
  • Proteins (molecular modeling) or proteins determined by in vitro selection. Coding DNA sequences obtained by back-translating a polypeptide sequence according to the codon usage specific for the host organism are particularly suitable. The specific codon usage can be carried out by a person skilled in the art with molecular genetic methods
  • homologous sequences are to be understood as those which are complementary to and / or hybridize with the nucleotide sequences according to the invention.
  • hybridizing sequences includes, according to the invention, substantially similar nucleotide sequences from the group of DNA or RNA, which enter into a specific interaction (binding) with the aforementioned nucleotide sequences under known stringent conditions. This also includes short nucleotide sequences with a length of, for example, 10 to 30, preferably 12 to 15 nucleotides. This includes u. a. also so-called "primers" or probes.
  • sequence regions with a regulatory function included. You can influence the transcription, the RNA stability or the RNA processing as well as the translation. Examples of regulatory sequences include promoters, enhancers, operators, terminators or translation enhancers.
  • a biologically active part of the enzyme according to the invention is to be understood according to the invention as meaning any polypeptide sequence which has the essential and specific enzyme activity for the formation of C-C compounds.
  • the length of a biologically active part of a benzaldehyde lyase according to the invention can vary, for example, in the range from 560 ⁇ 10 amino acid residues to 560 + 250 amino acid residues, preferably from 560 ⁇ 50 to 560 + 100 and particularly preferably from 560 + 25 to 560 ⁇ 50 amino acid residues.
  • the “base number” of 560 amino acid residues according to the invention corresponds to a polypeptide sequence of a benzaldehyde lyase according to SEQ ID NO. 2 encoded by a nucleotide sequence according to SEQ ID NO. 1. Accordingly, the “base number” of the polypeptide can also vary depending on the nucleotide sequence encoding it ,
  • modified forms are understood to mean enzymes in which there are changes in the sequence, for example at the N- and / or C-terminus of the polypeptide or in the region of conserved amino acids, but without impairing the function of the enzyme. These changes can be made by exchanging one or more amino acids according to methods known per se.
  • a special embodiment variant of the present invention comprises variants of the polypeptides according to the invention, the activity and / or specificity of which is weakened or enhanced, for example by amino acid exchange, compared to the respective starting protein.
  • the present invention furthermore relates to polypeptides with the function of a benzaldehyde lyase, the amino acid sequence of which is changed in such a way that they are desensitive to regulatory compounds, for example end products of the metabolic pathway (feedback-desensitive).
  • Isoforms are to be understood as enzymes with the same or comparable substrate and activity specificity, but which have a different primary structure.
  • an isolated benzaldehyde lyase of the type described above or cell extracts or whole cells containing a benzaldehyde lyase are used in the present process.
  • an isolated benzaldehyde lyase and / or cell extract containing a benzaldehyde lyase according to the invention are used in an enzyme membrane reactor.
  • other in vitro systems for the stereoselective production of compounds containing 2-hydroxyketone groups are also included.
  • Suitable systems for the use of whole cells containing a benzaldehyde lyase according to the invention are, for example, common cultivation methods in batch mode, fed-batch mode or continuous fermentations.
  • the process according to the invention is further characterized in that a benzaldehyde lyase from microorganisms, preferably of the genus Pseudomonas or Acinetobacter is used.
  • a benzaldehyde lyase from Pseudomonas fluorescens and in particular from Pseudomonas fluorescens Biovar I is preferably used.
  • the present invention also includes a benzaldehyde lyase from so-called production strains. These can be obtained either naturally or artificially. The latter includes classic mutagenesis methods or, for example, genetic engineering methods.
  • the present invention further comprises a benzaldehyde lyase for use in a previously mentioned method, encoded by a nucleotide sequence according to SEQ ID NO. 1 or an allele, homologue or derivative of this nucleotide sequence or a nucleotide sequence hybridizing with this.
  • This also includes a benzaldehyde lyase with an amino acid sequence as shown in SEQ ID NO. 2 or a biologically active part or a modified form thereof or isoenzymes or mixtures thereof.
  • the benzaldehyde lyase according to the invention can be isolated from microorganisms, preferably of the genus Pseudomonas or Acinetobacter. According to the invention, it is preferably a benzaldehyde lyase isolated from the species Pseudomonas fluorescens, particularly preferably of the species Pseudomonas fluorescens Biovar I. These explanations are exemplary, but in no way limit the present invention.
  • the present invention also includes so-called production strains for the isolation of a corresponding benzaidehyde lyase.
  • the present invention also relates to a Nucleotide sequence coding for a benzaldehyde lyase isolated from organisms of the type described above.
  • a nucleotide sequence or a nucleic acid fragment is to be understood as a polymer made from RNA or DNA, which can be single or double-stranded and optionally contain natural, chemically synthesized, modified or artificial nucleotides.
  • DNA polymer also includes genomic DNA, cDNA or mixtures thereof.
  • the present invention furthermore relates to a gene structure comprising a previously described nucleotide sequence coding for a benzaldehyde lyase according to the invention, and to it operatively linked regulatory sequences which control the expression of the coding sequences in the host cell.
  • An operative link is understood to mean the sequential arrangement of, for example, the promoter, coding sequence, terminator and, if appropriate, further regulatory elements, in such a way that each of the regulatory elements can perform its function as intended in the expression of the coding sequence.
  • These regulatory nucleotide sequences can be of natural origin or can be obtained by chemical synthesis.
  • any promoter which can control gene expression in the corresponding host organism is suitable as the promoter. According to the invention, this can also be a chemically inducible promoter by means of which the expression of the genes underlying it in the host cell can be controlled at a specific point in time.
  • a promoter that can be induced by IPTG (isopropyl- ⁇ -thiogalactoside) is mentioned here as an example.
  • a gene structure is produced by fusing a suitable promoter with at least one nucleotide sequence according to the invention using common recombination and cloning techniques, as described, for example, in T. Maniatis, EF Fritsch and J. Sambrook, Molecular Cloning: A Laboratory Manual, Cold Spring Harbor Laboratury, Cold Spring Harbor, NY (1994).
  • adapters or linkers can be attached to the fragments.
  • the present invention relates to a vector containing a nucleotide sequence of the type described above coding for a benzaldehyde lyase, with the regulatory nucleotide sequences operatively linked to it and additional nucleotide sequences for selecting transformed host cells, for replication within the host cell or for integration into the corresponding host cell. genome.
  • the vector according to the invention can contain a gene structure of the aforementioned type.
  • the present invention further relates to a transformed single or multicellular organism for use in a method of the aforementioned type, which a benzaldehyde lyase and / or
  • Nucleic acid sequences are transferred to a host cell using standard genetic engineering methods.
  • the preferred method here is the transformation and the transmission of
  • this transformed single or multi-cell is distinguished
  • Organism in that it is a microorganism, a yeast, a fungus, an animal or a plant cell.
  • the organism transformed according to the invention preferably belongs to the group of Enterobacteria. It is particularly preferably a transformed organism of the type Escherichia coli.
  • the present invention also includes so-called production strains which are suitable for producing the compounds according to the invention.
  • the present invention furthermore relates to the use of the compounds according to the invention containing 2-hydroxyketone groups for the preparation of compounds having an antiviral and / or antifungal action and / or having the action of enzyme inhibitors which are used in the fields of pharmacy and / or medicine, for example for the treatment of immune diseases (AIDS) or neurodegenerative diseases (epilepsy).
  • AIDS immune diseases
  • epilepsy neurodegenerative diseases
  • This can be, for example, (chiral) precursors or components of antibiotics, such as Act chloramphenicol.
  • antibiotics such as Act chloramphenicol.
  • compounds with an antifungal effect here z. B. Genaconazole called (Gala D. et al., 1996, Tetrahedron Letters, 37 (5): 611-614 or Leuenberger H. G. W. et al., 1999, Chimia, 53: 536-540).
  • the present invention is characterized in more detail by the following exemplary embodiments, which, however, are not limiting.
  • the gene coding for the benzaldehyde lyase was isolated by known methods from Pseudomonas fluorescens. The gene coding for the benzaldehyde lyase was then cloned into the inducible vector pKK322-2 (Pharmacia Biotech) and provided at its 3 'end with six triplets coding for histidine.
  • the resulting vector pkk322-2 was then transformed into the E. coli strain SG13009prep4 (Quiagen, Hilden).
  • IPTG isopropyl- ⁇ -D-thiogalactoside
  • the cell harvest was carried out after a further 16 h by centrifugation. Depending on the scale of the culture batch, the cells were disrupted mechanically with glass beads or in a ball mill.
  • the crude cell extract obtained was freed of cell debris by centrifugation and subsequent filtration and applied to a nickel chelate chromatography column (preferably: Ni-NTA agarose; Qiagen, Hilden).
  • the column was previously equilibrated with 50 mM potassium phosphate buffer, pH 7.0. Washing with the equilibration buffer rinses out non-binding components.
  • the same buffer with the addition of 50 mM imidazole was then used to elute weakly bound proteins.
  • the benzaldehyde lyase with its histidine end (BAL-His) selectively elutes in the presence of 200 mM imidazole.
  • the collected protein fractions were then by gel filtration in 50 mM potassium phosphate buffer, pH 6.5, with 1 mM MgSO 4 and 0.01 mM Buffered thiamine pyrophosphate (TPP). Finally, the benzaldehyde lyase was lyophilized and stored at -20 ° C.
  • 318 mg (3 mM) benzaldehyde are dissolved in a mixture of 20 ml DMSO and 100 ml phosphate buffer (50 mM, pH 7.0) containing 2.5 mM MgSO 4 and 0.15 mM TPP.
  • the reaction is started by adding 1 mg (20 U) of benzaldehyde lyase and the reaction mixture is incubated for 48 hours at room temperature. Then another 1 mg (20 U) of benzaldehyde lyase are added.
  • the course of the reaction is observed by means of combined gas chromatography / mass spectroscopy (GC-MS) or high pressure liquid chromatography (HPLC). After 62 hours, a 97% conversion to (R) -benzoin is achieved.
  • GC-MS gas chromatography / mass spectroscopy
  • HPLC high pressure liquid chromatography
  • reaction mixture is extracted with 250 ml dichloromethane, the organic phase with 25 ml dist. Washed water and 25 ml of saturated NaCl solution and dried over Na 2 S0 4 . The solvent is then removed in vacuo. By recrystallizing the crude product, 305 mg (96%) (R) - benzoin are obtained (melting point 134 ° C.). The enantiomeric excess is> 99%.
  • 318 mg (3 mM) benzaldehyde are dissolved in a mixture of 20 ml DMSO and 100 ml potassium phosphate buffer (50 mM, pH 7.0) containing 2.5 mM MgSO 4 and 0.15 mM TPP.
  • the reaction is started by adding 1 mg (20 U) of benzaldehyde lyase and incubated at room temperature. 88 mg (2 mM) acetaldehyde are added to this reaction mixture. After adding a further 1 mg (20 U) of benzaldehyde lyase, the reaction mixture is further incubated at room temperature.
  • Lyase from Pseudomonas fluorescens (SEQ ID NO. 1) and the amino acid sequence derived from it, as well as a separate representation of the amino acid sequence (SEQ ID NO. 2) of the benzaldehyde lysis from Pseudomonas fluorescens.

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Abstract

L'invention concerne une séquence nucléotidique codant une benzaldéhyde-lyase, ainsi que son utilisation dans un procédé de préparation stéréosélective de composés contenant des groupes 2-hydroxycétone.
EP01962797A 2000-07-03 2001-06-29 Sequence nucleotidique codant une benzaldehyde-lyase et procede de synthese stereoselective de 2-hydroxycetones Withdrawn EP1297159A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10032254A DE10032254B4 (de) 2000-07-03 2000-07-03 Nukleotidsequenz kodierend für eine Benzaldehyd-Lyase und Verfahren zur stereoselektiven Synthese von (R)-2-Hydroxyketonen
DE10032254 2000-07-03
PCT/EP2001/007426 WO2002002753A2 (fr) 2000-07-03 2001-06-29 Sequence nucleotidique codant une benzaldehyde-lyase et procede de synthese stereoselective de 2-hydroxycetones

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CN108558628B (zh) * 2018-04-03 2021-06-25 宁夏医科大学 安息香的制备方法
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US20040014182A1 (en) 2004-01-22
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