Stereoselectivity and enantioselectivity of glutathione S-transferase toward stilbene oxide substrates.
作者信息
deSmidt P C, McCarrick M A, Darnow J N, Mervic M, Armstrong R N
出版信息
Biochem Int. 1987 Mar;14(3):401-8.
PMID:3593384
Abstract
Isozyme 4-4 of rat liver glutathione S-transferase catalyzes the stereoselective addition of glutathione to the oxirane carbon of R-absolute configuration of cis-stilbene oxide, 2, to give 98 +/- 2% of the (1S,2S)-1,2-diphenyl-1-(S-glutathionyl)-2-hydroxyethane product with a turnover number (kc) of 0.22 s-1. The two enantiomers of trans-stilbene oxide, 3, are somewhat poorer substrates for the enzyme. Enantioselective addition of glutathione to 3 proceeds with turnover numbers of 0.12 s-1 and 0.023 s-1 for the (R,R,)- and (S,S)-antipodes, respectively.
摘要
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