title: Enhancement of enzyme activity and enantioselectivity by cyclopentyl methyl ether in the transesterification catalyzed by Pseudomonas cepacia lipase co-lyophilized with cyclodextrins.
abstract: The solvent effects of cyclopentyl methyl ether (CPME) on the reaction rates and enzyme enantioselectivity in the enantioselective transesterifications of racemic 6-methyl-5-hepten-2-ol (racemic sulcatol: SUL) and racemic 2,2-dimethyl-1,3-dioxolane-4-methanol (racemic solketal: SOL) with a series of enol esters catalyzed by Pseudomonas cepacia lipase co-lyophilized with cyclodextrins (alpha-, beta-, gamma-, partially methylated beta-, and 2,3,6-tri-O-methyl-beta-cyclodextrin: alphaCyD; betaCyD; gammaCyD; Me1.78betaCyD; Me3betaCyD) were investigated and compared with those in diisopropyl ether (IPE). In the case of SUL, enzyme activities of the co-lyophilizate with Me1.78betaCyD in CPME were lower than those in IPE with every acyl source, however, the absolute enantiopreference was shown in the transesterification with vinyl butyrate (VBR) in IPME. When the substrates were SOL and VBR, the enzyme activities in CPME were greatly enhanced as high as 1.6-9.8-fold, while the enantioselectivities in CPME were comparable to those in IPE.
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: Lin
authors.initials: L
authors.lastname: Zhang
authors.forename: Kimitoshi
authors.initials: K
authors.lastname: Fukunaga
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Sugimura
mesh_terms: D001671:Biochemistry / Q000379:methods; D016956:Burkholderia cepacia / Q000201:enzymology*; D003505:Cyclodextrins / Q000737:chemistry / Q000378:metabolism*; D003517:Cyclopentanes / Q000737:chemistry* / Q000378:metabolism; D004800:Enzymes, Immobilized; D004951:Esterification; D004987:Ethers / Q000737:chemistry* / Q000378:metabolism; D005612:Freeze Drying; D008049:Lipase / Q000737:chemistry / Q000378:metabolism*; D012997:Solvents / Q000737:chemistry; D013237:Stereoisomerism; D013379:Substrate Specificity
chemical_list: D003505:Cyclodextrins; D003517:Cyclopentanes; D004800:Enzymes, Immobilized; D004987:Ethers; D012997:Solvents; D008049:Lipase