摘要:
The present invention relates to a nucleotide sequence which encodes a benzaldehyde lyase and to its use in a process for stereoselectively preparing 2-hydroxyketone group-containing compounds.
摘要:
The invention relates to new mutants of formate dehydrogenase from Candida boidinii, new gene sequences encoding these and use of the new formate dehydrogenases. The wild type FDH used hitherto in the industrial process for preparing amino acids becomes inactive after a certain time. New mutants of this wild type have been produced by targeted mutagenesis of a recombinant FDH from E. coli. The new mutants are preferably used in an enzymatic process for preparing chiral compounds.
摘要:
A process for obtaining a pyruvate decarboxylase by isolation from a producer organism. The pyruvate decarboxylase is capable of forming (R)-(-)-phenylacetylcarbinole (I) in .gtoreq.95% enantiomer unit with a product ratio of (I) to 2-hydoxypropiophenone of .gtoreq.95%. In addition, the pyruvate decarboxylase has a specific activity with regard to phenylacetylcarbinole formation of >1U/mg. It is the aim of the invention to obtain a pyruvate decarboxylase with improved synthesis capacity concerning the formation of (R)-(-)-phenylacetylcarbinole. The process of the invention developed for this purpose is characterized in that use is made of a producing organism with a gene coding for pyruvate decarboxylase from Zymomonas mobilis, in the DNA sequence of which the tryptophane radical coding codon TGG is replaced at position 1174-1176 by a codon which codes for an amino acid radical with a reduced volume ratio.