| 摘要 |
Stereoselective decarboxylation of alpha -substituted (hetero)arylmalonic acid derivatives (II) to corresponding alpha -substituted (hetero)arylacetic acids (I), comprises using a decarboxylase (A). Stereoselective decarboxylation of malonic acid derivatives of formula R-C(X)(COOH) 2(II) to monocarboxylic acids of formula R-CHX-COOH (I), comprises using a decarboxylase (A). X : OH, SH, 2-10C alkyl, 1-10C alkoxy or NH 2; and R : optionally fused (hetero)aryl, optionally substituted by halo, alkyl, alkenyl or alkynyl. Independent claims are also included for: (1) new decarboxylases (A'), having an amino acid sequence corresponding to a sequence of 250 amino acids (given in the specification as SEQ ID NO:1), but having mutation(s) including replacement of the amino acids in the 17, 19, 22, 25, 32, 41, 42, 45, 47, 53, 60, 61, 63, 68, 74, 84, 85, 87, 94, 103, 112, 119, 121, 142, 155, 168, 173 and/or 178 positions (provided that the cysteine in the 188 position must not be replaced) and/or insertion and/or deletion mutations involving introduction and/or deletion of (each) are = 10 amino acid residues; (2) the preparation of (A'), by expressing (A') in a host organism using a vector containing a polynucleotide sequence of 769 bases (given in the specification as SEQ ID NO:2) with appropriate exchange of bases to encode the mutations in (A') and/or the corresponding gene with chromosomal integrated regulatory units, and optionally purifying (A'); and (3) transformed host organisms expressing (A'). |
