Abstract:
This invention relates to S-hydroxynitrile lyase having excellent tolerance to heat, organic solvents, and the like, which is obtained by modifying at least one amino acid in the helix D3', helix A, and β-sheet 2 domains in the amino acid sequence of wild-type S-hydroxynitrile lyase.
Abstract:
Die Erfindung betrifft neue Bakterienstämme Delftia acidovorans MC1-R, Verfahren zu ihrer Herstellung sowie ihre Verwendung zur Produktion von hochreinen R-Enantiomeren von 2-Phenoxypropionsäure-Derivaten. Insbesondere betrifft sie den Bakterienstamm Delftia acidovorans MC1-R DSM 15376 sowie seine Verwendung.
Abstract:
Die Erfindung betrifft neue Bakterienstämme Delftia acidovorans MC1-S, Verfahren zu ihrer Herstellung sowie ihre Verwendung zur Produktion von hochreinen S-Enantiomeren von 2-Phenoxypropionsäure-Derivaten. Insbesondere betrifft sie den Bakterienstamm Delftia acidovorans MC1-S DSM 15377 sowie seine Verwendung.
Abstract:
The invention described herein relates to coenzymes useful for the synthesis of L-carnitine, particularly a compound of coenzyme A, and more particularly gamma-butyrobetainyl-coenzyme A and crotonobetainyl-coenzyme A, to procedures for their preparation and to their use for the production of L(-)-carnitine from crotonobetaine and D(-)-carnitine.
Abstract:
A process and composition for preparing D-aspartic acid and beta -alanine from D,L-aspartic acid, wherein a solution of D,L-aspartic acid or a salt thereof is contacted with a composition having an L-aspartate- alpha -decarboxylase activity of greater than 100 mu mol L-aspartate used per hour per gram of cells, under appropriate conditions to produce D-aspartic acid and beta -alanine.
Abstract:
The present invention relates to a novel epoxide hydrolase enzyme which aims to achieve a high degree of resolution towards a broader range of substrates with high enantioselectivity and yields with minimal product inhibition. The invention further relates to a new bacterial strain Achromobacter sp. MTCC 5605 isolated from a petroleum-contaminated sludge sample, capable of producing the said enzyme. It is notable that the enzyme can be used as whole bacterial cell preparation, which allows continuous hydrolysis of substrates at even higher concentration and have an advantage of being recycled. The invention further relates to a process for the hydrolysis of different aryl epoxides which are potential synthons of intermediates for the synthesis of chiral amino alcohols and bioactive compounds like beta-blockers.
Abstract:
The invention relates to R -hydroxynitrile lyases with improved substrate acceptance, increased activity and increased selectivity, obtainable by introducing random mutations with the aid of random mutagenesis and/or saturation mutagenesis techniques, identifyingby means of screening or selection and, where appropriate, subsequently combining advantageous mutations, and to the use thereof.
Abstract:
The invention relates to a process for the preparation of an enantiomerically enriched nitrile by reacting an epihalohydrin (derivative) with Br - and CN - in the presence of an enantioselective haloalcohol dehalogenase. The process of the invention leads to enantiomerically enriched nitriles in a high yield and in a high enantiomeric excess. Preferably the haloalcohol dehalogenase used is HheC, more preferably HheC from Agrobacterium radiobacter AD1, most preferably the W249F mutant from HheC from Agrobacterium radiobacter AD1. In one preferred embodiment of the invention the epihalohydrin (derivative) is epichlorohydrin. The enantiomerically enriched nitriles obtained by the process of the invention are especially suitable as intermediates in the preparation of statins, in particular of atorvastatin or rosuvastatin.
Abstract:
The invention provides yeast strains, and polypeptides encoded by genes of such yeast strains, that have enantiospecific internal epoxide hydrolase activity. The invention also features nucleic acid molecules encoding such polypeptides, vectors containing such nucleic acid molecules, and cells containing such vectors. Also embraced by the invention are methods for obtaining optically active internal epoxides and corresponding optically active internal diols.
Abstract:
A process for the production of an altered microbial enzyme, especially an aminotransferase, which displays catalytic activity towards the L-enantiomer of an amino acid which is not the normal substrate for the precursor enzyme comprises treating a microorganism with a mutagenic agent, growing the microorganism so treated on a medium containing said amino acid as the sole nitrogen source and isolating surviving microorganisms containing enzymes capable of using said amino acid as a substrate. The process involves the use of a random chemical mutagen followed by a biological selection procedure and does not require prior knowledge of the protein structure of the enzyme nor site-directed mutagenesis.