Comparison of Deacylation Rates of Chymotryptic Catalysis within an Enantiomeric Pair of p-Nitrophenyl Esters.
作者:Kazutaka TANIZAWA、Hiroyuki YAMADA、Kunihiko ITOH、Yuichi KANAOKA
DOI:10.1248/cpb.39.2748
日期:——
p-Nitrophenyl esters carrying a chiral acyl group were synthesized. These compounds were shown to meet the requirements of chymotrypsin for the specific binding and the acylation. Therefore, the behavior of p-nitrophenyl esters with chymotrypsin is considered to be virtually identical to that of p-amidinophenyl esters with trypsin which were proposed as "inverse substrates" for the enzyme. These esters, derived from each pair of enantiomers, have been successfully used for the analysis of enantiomeric preference of chymotrypsin at the deacylation stage. The chiral requirement of the enzyme active site for the catalytic efficiency was discussed.
合成了带有手性酰基的对硝基苯基酯。这些化合物被证明符合胰蛋白酶在特定结合和酰化方面的要求。因此,认为对硝基苯基酯与胰蛋白酶的作用几乎与对氨基苯基酯与胰酶的作用相同,后者被提议作为该酶的“逆底物”。这些酯源自每对对映体,已成功用于分析胰蛋白酶在去酰化阶段的对映体偏好。讨论了酶活性位点对催化效率的手性需求。