Investigation of the kinetic and stereochemical recognition of arene and azaarene oxides by isozymes A2 and C2 of glutathione S-transferase.

Investigation of the kinetic and stereochemical recognition of arene and azaarene oxides by isozymes A2 and C2 of glutathione S-transferase.
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研究谷胱甘肽 S-转移酶同工酶 A2 和 C2 对芳烃和氮杂芳烃氧化物的动力学和立体化学识别。

DOI:
10.1016/0006-291x(84)90773-3
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发表时间:
1984
影响因子:
3.1
通讯作者:
Armstrong,RN
Armstrong,RN
中科院分区:
生物学4区
文献类型:
--
作者:
Boehlert,CC;Armstrong,RN

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研究了大鼠肝谷胱甘肽s -转移酶密切相关的同工酶a2和c2对几种芳烃和叠氮芳烃氧化物的立体选择性。同工酶c2具有立体特异性,催化谷胱甘肽在R绝对构型的氧环碳上对一系列k区芳烃氧化物(包括菲9,10-氧化物,1)的攻击。在联苯体系中氮的取代会导致立体特异性的丧失。同工酶a2对芳烃氧化物和叠氮芳烃氧化物均表现出较低的立体选择性。对这两种同工酶的动力学研究表明,虽然同工酶c2的翻转速度比同工酶a2快,但当4,5-二氮菲9,10-氧化物为底物时,情况则相反。同型二聚体同工酶a2和c2的动力学和立体化学行为可以用来预测异型二聚体同工酶AC的立体选择性,这可能表明催化对三种同工酶的不同亚基-亚基相互作用不敏感。
The stereoselectivity of the closely related isozymes A2and C2of rat liver glutathione S-transferase toward several arene and azaarene oxides is examined. Isozyme C2is stereospecific, catalyzing attack of glutathione at the oxirane carbon of R absolute configuration for a series of K-region arene oxides including phenanthrene 9,10-oxide,1. Substitution of nitrogen in the biphenyl system of1causes a loss in stereospecificity. Isozyme A2exhibits a low degree of stereoselectivity toward both arene and azaarene oxides. Kinetic studies of the two isozymes show that although isozyme C2turns over1faster than does isozyme A2the opposite is true when 4,5-diazaphenanthrene 9,10-oxide is the substrate. The kinetic and stereochemical behavior of the homodimeric isozymes A2and C2can be used to predict the stereoselectivity of the heterodimeric isozyme AC perhaps suggesting that catalysis is insensitive to different subunit-subunit interactions in the three isozymes.
微粒体环氧化物水解酶对芳烃氧化物底物的对映选择性。
DOI: --
发表时间: 1981
影响因子: 4.8
作者:
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通讯作者: D. Jerina
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DOI: --
发表时间: 1981
期刊: Biochemical and Biophysical Research Communications - BBRC
影响因子: --
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DOI: --
发表时间: 1982
期刊: Biochemical and Biophysical Research Communications - BBRC
影响因子: --
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DOI: --
发表时间: 1980
影响因子: 4.8
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DOI: --
发表时间: 1983
期刊: The Journal of biological chemistry
影响因子: --
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通讯作者: Kreibich,G