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
中科院分区:
文献类型:
--
作者:
Halaka,FG;Barnes,ZK;Babcock,GT;Dye,JL
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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DOI:
10.1042/bj2090175
发表时间:
1983
期刊:
The Biochemical journal
影响因子:
--
作者:
G. Jones;M. G. Jones;M. Wilson;M. Brunori;A. Colosimo;P. Sarti
通讯作者:
P. Sarti
DOI:
10.1073/pnas.78.11.7115
发表时间:
1981
影响因子:
11.1
作者:
M. Wilson;J. Peterson;E. Antonini;M. Brunori;A. Colosimo;J. Wyman
通讯作者:
J. Wyman
影响因子:
2.9
作者:
C. Suelter;R. B. Coolen;N. Papadakis;J. L. Dye
通讯作者:
J. L. Dye
DOI:
10.1016/s0021-9258(18)91415-8
发表时间:
1964
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
H. Beinert;G. Palmer
通讯作者:
G. Palmer
DOI:
10.1042/bj1570591
发表时间:
1976
期刊:
The Biochemical journal
影响因子:
--
作者:
C. Greenwood;T. Brittain
通讯作者:
T. Brittain