Transesterification of phenylalanine by means of chymotrypsin in the presence of dimethylsulfoxide
The addn. of a miscible org. solvent, which decreases the water concn. of the system, is considered as a means to reduce hydrolysis when transesterification is the desired reaction. This approach is illustrated by the study of a model reaction, the kinetically controlled transesterification of a racemic mixt. of phenylalanine Pr ester with 1,4-butanediol by chymotrypsin (EC 22.214.171.124) in the presence of the miscible org. solvent, DMSO. The results showed that no appreciable effect on the transesterification productivity or on the initial differential and integral selectivity is obsd. for DMSO concns. up to 20%. At higher concns., the transesterification productivity diminishes while the initial differential and the integral selectivity remain essentially unchanged. These observations can be explained by attributing an inhibitory role to DMSO acting on the formation of the acyl-enzyme intermediate. [on SciFinder (R)]
Inst. Genie Chim.,Ec. Polytech. Fed. Lausanne,Lausanne,Switz.
written in English.
67-68-5 (DMSO) Role: PRP (Properties) (chymotrypsin-catalyzed transesterification reaction response to); 136680-70-1 (L-Phenylalanine 4-hydroxybutyl ester) Role: FORM (Formation, nonpreparative) (formation of, in chymotrypsin-catalyzed transesterification reaction, DMSO effect on); 114260-57-0 Role: BIOL (Biological study) (transesterification of butanediol with, DMSO effect on chymotrypsin-catalyzed); 9004-07-3 (Chymotrypsin) Role: BIOL (Biological study) (transesterification of phenylalanine Pr ester with butanediol catalyzed by, DMSO effect on); 110-63-4 (1,4-Butanediol) Role: BIOL (Biological study) (transesterification of phenylalanine Pr ester with, DMSO effect on chymotrypsin-catalyzed)
Record created on 2006-04-18, modified on 2016-08-08