期刊
BIORESOURCE TECHNOLOGY
卷 101, 期 22, 页码 8911-8914出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2010.06.098
关键词
4-Chloro-3-oxobutanoate ethyl; (S)-4-Chloro-3-hydroxybutanoate ethyl; Biocatalysis; Carbonyl reductase; Pichia stipitis
资金
- Major Basic Research Program of China [2009CB724700]
- National Key Technology RD Program [2008BAI63B07]
- Nanjing University of Technology [BSCX200911]
A novel NADH-dependent carbonyl reductase (PsCR II) gene with an open reading frame of 855 bp encoding 285 amino acids was cloned from Pichia stipitis. Analysis of the amino acid sequence of PsCR II revealed less than 55% identity to known reductases that produce (S)-4-chloro-3-hydroxybutanoates ethyl [(S)-CHBE]. When NADH was provided as an electron donor, Escherichia coli with pET-22b-PsCRII exhibited an activity of 15 U/mg protein using 4-chloro-3-oxobutanoate ethyl (COBE) as a substrate. This activity was the highest ever reported for reductases, with the exception of PsCR I, which in our previous analysis required NADPH for catalysis. Biocatalysis of COBE to (S)-CHBE was investigated using E. coli with a polycistronic plasmid pET-BP II co-expressing PsCR II and a glucose dehydrogenase in a water/butyl acetate system for 24 h. The transformants gave a molar yield of 91%, and an optical purity of the (S)-isomer of higher than 99% enantiomeric excess. (C) 2010 Elsevier Ltd. All rights reserved.
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