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Investigation of the arylnitroso reductase activity of pig liver aldehyde reductase.

机译:猪肝醛还原酶的芳基亚硝基还原酶活性的研究。

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摘要

The reduction of p-nitroso-N-dimethylaniline, p-nitroso-N-diethylaniline, p-nitrosophenol and p-nitroso-N-phenylaniline with NADPH in the presence of aldehyde reductases 1 and 2 is described. The reactivity of these nitroso substrates is increased by hydrophobic substituents and those promoting OH- elimination from the molecule of the reduced substrate. NN-Dimethylbenzoquinonedi-iminium cation was proved to be the reaction product formed from p-nitroso-N-dimethylaniline. The kinetics of the reduction of p-nitroso-N-dimethylaniline catalysed with aldehyde reductase 1 are rather complex at pH 7, and the preferred-pathway mechanism is probably involved. The reaction sequence approaches the ordered pattern at pH 8.5. It was shown that NADPH in equilibrium NADP+ recyclization proceeds in the presence of NADP+, p-nitroso-N-dimethylaniline, cyclohexanol and aldehyde reductase 1, the alcohol oxidation being the slowest step in this reaction. However, the rate of cyclohexanol oxidation surpasses that of the dissociation of NADPH from the enzyme.
机译:描述了在醛还原酶1和2存在下用NADPH还原对-亚硝基-N-二甲基苯胺,对-亚硝基-N-二乙基苯胺,对-亚硝基苯酚和对-亚硝基-N-苯基苯胺。这些亚硝基底物的反应性通过疏水性取代基和促进从还原的底物分子中消除OH的取代基来提高。 NN-二甲基苯醌二亚胺阳离子被证明是由对亚硝基-N-二甲基苯胺形成的反应产物。在pH 7时,用醛还原酶1催化的对亚硝基-N-二甲基苯胺还原反应的动力学相当复杂,可能涉及了优选的途径。反应顺序在pH 8.5时接近有序模式。已经表明,在NADP +,对亚硝基-N-二甲基苯胺,环己醇和醛还原酶1的存在下,NADPH在平衡NADP +再循环中进行,醇氧化是该反应中最慢的步骤。但是,环己醇的氧化速率超过了NADPH从酶中解离的速率。

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