Obtaining optical purity for product diols in enzyme-catalyzed epoxide hydrolysis: contributions from changes in both enantio- and regioselectivity
2012 (English)In: Biochemistry, ISSN 1520-4995, E-ISSN 0006-2960, Vol. 51, no 38, 7627-7637 p.Article in journal (Refereed) Published
Enzyme variants of the plant epoxide hydrolase StEH1 displaying improved stereoselectivities in the catalyzed hydrolysis of (2,3-epoxypropyl)benzene were generated by directed evolution. The evolution was driven by iterative saturation mutagenesis in combination with enzyme activity screenings where product chirality was the decisive selection criterion. Analysis of the underlying causes of the increased diol product ratios revealed two major contributing factors: increased enantioselectivity for the corresponding epoxide enantiomer(s) and, in some cases, a concomitant change in regioselectivity in the catalyzed epoxide ring-opening half-reaction. Thus, variant enzymes that catalyzed the hydrolysis of racemic (2,3-epoxypropyl)benzene into the R-diol product in an enantioconvergent manner were isolated.
Place, publisher, year, edition, pages
2012. Vol. 51, no 38, 7627-7637 p.
stereoselectivity, enantioconvergence, epoxide hydrolase, directed evolution
Biochemistry and Molecular Biology
Research subject Biochemistry
IdentifiersURN: urn:nbn:se:uu:diva-180115DOI: 10.1021/bi3007725ISI: 000309040700022PubMedID: 22931287OAI: oai:DiVA.org:uu-180115DiVA: diva2:548171
FunderSwedish Research Council