Highly Enantioselective Reduction of Carbonyl Compounds Using a Reductase Purified from Bakers' Yeast
作者:Tadashi Ema、Yasushi Sugiyama、Minoru Fukumoto、Hiroyuki Moriya、Jing-Nan Cui、Takashi Sakai、Masanori Utaka
DOI:10.1021/jo980165e
日期:1998.7.1
An NADPH-dependent reductase that shows reducing activity for 1-chloro-2-hexanone has been purified from bakers' yeast. SDS-PAGE and gel filtration suggested that the purified reductase is a monomeric enzyme with a molecular weight of ca. 37 kDa. Asymmetric reduction of several carbonyl compounds using the purified reductase has been carried out. 1-Chloro-2-hexanone, 1-acetoxy-2-heptanone, methyl acetoacetate, ethyl pyruvate, 1-chloro-2,4-pentanedione, and 2,4-hexanedione were reduced to the corresponding alcohols with high enantiomeric purities (>98% ee). The reductase showed high specificity constants (k(cat)/K-m = 10(3)-10(5) s(-1) M-1) and relatively low Michaelis constants (K-m= 10(-4)-10(-3) M) for all the substrates examined.