摘要:
A process is disclosed that bioconverts indene to (1S)-amino-(2R)-indanol substantially free of any of its stereoisomers, by the action of a strain of P. putida or Rhodococcus sp., followed by various chemical step(s), e.g., chiral specific crystallization, treatment with strong acid in the presence of acetonitrile.
摘要:
A genetically engineered glucose isomerase with improved affinity for D-glucose and the method of preparation of such a glucose isomerase are disclosed. The glucose isomerase is obtained by mutagenizing the gene of a naturally occurring glucose isomerase such that a smaller amino acid replaces a larger amino acid in the catalytic site. In an especially advantageous embodiment of the present invention, the Clostridium glucose isomerase sequence is mutated and the residue replaced with a smaller amino acid is either Trp.sub.139 or Val.sub.186.