Reduction of cytochrome oxidase by 5,10-dihydro-5-methylphenazine: kinetic parameters from rapid-scanning stopped-flow experiments.

Reduction of cytochrome oxidase by 5,10-dihydro-5-methylphenazine: kinetic parameters from rapid-scanning stopped-flow experiments.
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5,10-二氢-5-甲基吩嗪还原细胞色素氧化酶:来自快速扫描停流实验的动力学参数。

DOI:
10.1021/bi00304a019
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发表时间:
1984
期刊:
影响因子:
2.9
通讯作者:
Dye,JL
Dye,JL
中科院分区:
生物学3区
文献类型:
--
作者:
Halaka,FG;Barnes,ZK;Babcock,GT;Dye,JL

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福利姆湾Halaka,1 Zexia K.作者:巴恩斯Babcock和James L.染料 ** 摘要:用快速扫描和固定波长停流分光光度法在Soret、可见光和近红外光谱区研究了5,10-二氢-5-甲基吩嗪(MPH)还原静息细胞色素氧化酶及其氰化物复合物的动力学。在这项研究中,我们专注于一种形式的休息酶,其特征在于Soret吸收最大值在424 nm。这些实验补充了关于减少静息酶的418 nm吸收形式的早期工作[Halaka,F. G.,巴布科克湾T.,& Dye,J. L.(1981)J.Biol.Chem.256,1084-1087]。细胞色素a的还原在二级反应中完成,速率常数为3 X 105 M-1 s-1。还原的830 nm的吸收剂,Cua,是密切相关的,但滞后于细胞色素a的还原,我们已经解决了约20 s-1的速率常数为铜re-Redox反应是至关重要的理解细胞色素c氧化酶的催化活性在电子传递。在生物系统中,该酶催化分子氧的四电子还原为水[综述参见Malmstróm(1979)和Wikstróm et al.(1981)]。蛋白质的还原,无论是在厌氧条件下还是在氧存在下的周转过程中,都被排除在外。
Folim G. Halaka, 1 Zexia K. Barnes, Gerald T. Babcock, and James L. Dye** abstract: The kinetics of the reduction of resting cytochrome oxidase and of its cyanide complex by 5, 10-dihydro-5-methylphenazine (MPH) have been characterized by rapid-scan and fixed-wavelength stopped-flow spectrophotometry in the Soret, visible, and near-IR spectral regions. In this study, we focused on a form of the resting enzyme that is characterized by a Soret absorption maximum at 424 nm. These experiments complement earlier work on the reduction of a 418 nm absorbing form of the resting enzyme [Halaka, F. G., Babcock, G. T., & Dye, J. L.(1981) J. Biol. Chem. 256, 1084-1087], The reduction of cytochrome a is accomplished in a second-order reaction with a rate constant of 3 X 105 M" 1 s-1. The reduction of the 830-nm absorber, Cua, is closely coupled to but lags the reduction of cytochrome a\we have resolved a rate constant of about 20 s-1 for the copper re-Redox reactions are of central importance to the understanding of the catalytic activity of cytochrome c oxidase in electron transport. In biological systems, the enzyme catalyzes the four-electron reduction of molecular oxygen to water [for reviews see Malmstróm (1979) and Wikstróm et al.(1981)]. The reduction of the protein, either under anaerobic conditions or during turnover in the presence of oxygen, has been ex-
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