title: Stereochemistry of a diastereoisomeric amphiphile and the species of the lipase influence enzyme activity in the transesterification catalyzed by a lipase-co-lyophilizate with the amphiphile in organic media.
abstract: Modified Candida rugosa and Pseudomonas cepacia lipase (CRL and PCL) were co-lyophilized with two pairs of synthetic diastereoisomeric amphiphiles, D- and L-2-(3-[bis-[3-(2,3,4,5,6-pentahydroxy-hexanoylamino)-propyl]-carbamoyl]-propionylamino)-pentanedioic acid didodecyl ester (D- and L-BIG2C12CA); D- and L-2-(2,3,4,5,6-pentahydroxy-hexanoylamino)-pentanedioic acid didodecyl ester (D- and L-2C12GE). Enzyme activities of the modified lipase in the transesterification in organic solvent were evaluated. Both pairs of the diastereoisomeric amphiphiles showed enhanced enzyme activity in the transacetylation between racemic sulcatol and isopropenyl acetate in diisopropyl ether, catalyzed by the PCL-co-lyophilizate, by 19-48 fold when compared to the native lipase lyophilized from buffer alone independent of the stereochemistry of the amphiphiles, while in the case of the CRL-co-lyophilizate only the L-BIG2C12CA showed enhanced enzyme activity in the transbutyrylation between racemic solketal and vinyl butyrate in cyclohexane as high as 68-78 fold.
authors.affiliation: Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Yamaguchi University, 2-16-1 Tokiwadai, Ube 755-8611, Japan.
authors.forename: Yurie
authors.initials: Y
authors.lastname: Mine
authors.forename: Kimitoshi
authors.initials: K
authors.lastname: Fukunaga
authors.forename: Makoto
authors.initials: M
authors.lastname: Yoshimoto
authors.forename: Katsumi
authors.initials: K
authors.lastname: Nakao
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Sugimura
mesh_terms: D016956:Burkholderia cepacia / Q000201:enzymology*; D002175:Candida / Q000201:enzymology*; D004789:Enzyme Activation; D004951:Esterification; D008049:Lipase / Q000737:chemistry* / Q000145:classification*; D009930:Organic Chemicals / Q000737:chemistry*; D013045:Species Specificity; D013237:Stereoisomerism; D013379:Substrate Specificity; D013501:Surface-Active Agents / Q000737:chemistry*
chemical_list: D009930:Organic Chemicals; D013501:Surface-Active Agents; D008049:Lipase