Journal
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
Volume 97, Issue 11, Pages 4897-4906Publisher
SPRINGER
DOI: 10.1007/s00253-012-4396-2
Keywords
Directed evolution; Enantioselective esterase; Model substrate; Molecular dynamics simulation; Substrate range
Categories
Funding
- Natural Science Foundation of China [21176215/21176102]
- Zhejiang Province [R4110092]
- Program for Zhejiang Leading Team of ST Innovation [2011R50007]
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The present work created an esterase variant from Rhodobacter sphaeroides (RspE) with enhanced selectivity in hydrolytic kinetic resolutions by directed evolution. A model substrate, methyl mandelate, was introduced in the high-throughput screening procedure. E values of a variant CH (Asn62Cys/Leu145His) for six different esters were 10-83, which were a relative improvement compared to 2-20 for the wild type. Our subsequent crystal structure interpretation and molecular dynamics simulations helped shed light on the source of enantioselectivity modified by directed evolution. Though mutations displayed no direct interaction with the substrate, they were hypothesized to strengthen the intramolecular interaction in the catalytic cavity of variant. Conformation analysis revealed that the enhanced enantioselectivity of variant CH for the seven substrates applied in this study was derived from the decrease in size of the substrate binding pocket.
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