Substrate and stereochemical specificity of the organophosphorus acid anhydrolase from Alteromonas sp. JD6.5 toward p -nitrophenyl phosphotriesters
作者:Craig M. Hill、Feiyue Wu、Tu-Chen Cheng、Joseph J. DeFrank、Frank M. Raushel
DOI:10.1016/s0960-894x(00)00213-4
日期:2000.6
The enzyme OPAA hydrolyzes p-nitrophenyl phosphotriesters bearing substituents at the phosphorus center ranging in size from methyl to phenyl. The enzyme exhibits stereoselectivity toward the hydrolysis of chiral substrates with a preference for the Sp enantiomer. (C) 2000 Elsevier Science Ltd. All rights reserved.
Rationally Engineered Mutants of Phosphotriesterase for Preparative Scale Isolation of Chiral Organophosphates
作者:Feiyue Wu、Wen-Shan Li、Misty Chen-Goodspeed、Miguel A. Sogorb、Frank M. Raushel
DOI:10.1021/ja002546r
日期:2000.10.1
catalyze the hydrolysis of the most acidic phenolic substituent from an organophosphate triester. The overall rate of hydrolysis is very much dependent on the pKa of the leaving group phenol. 4b To enhance the substrate stereoselectivity exhibited by the wildtype enzyme, we designed and characterized several site-directed mutants of PTE. Three regions within the active site of PTE (small, large, and