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首页> 外文期刊>Biophysical Chemistry: An International Journal Devoted to the Physical Chemistry of Biological Phenomena >Steady-state cyclic electron transfer through solubilized Rhodobacter sphaeroides reaction centres
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Steady-state cyclic electron transfer through solubilized Rhodobacter sphaeroides reaction centres

机译：通过球形球形红细菌反应中心的稳态循环电子转移

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摘要

The mechanism, thermodynamics and kinetics of light-induced cyclic electron transfer have been studied in a model energy-transducing system consisting of solubilized Rhodobacter sphaeroides reaction center/light harvesting-1 complexes (so-called core complexes), horse heart cytochrome c and a ubiquinone-0/ubiquinol-0 pool. An analysis of the steady-state kinetics of cytochrome c reduction by ubiquinol-0, after a light-induced steady-state electron flow had been attained, showed that the rate of this reaction is primarily controlled by the one-electron oxidation of the ubiquinol-anion. Re-reduction of the light-oxidized reaction center primary donor by cytochrome c was measured at different reduction levels of the ubiquinone-0/ubiquinol-0 pool. These experiments involved single turnover flash excitation on top of background illumination that elicited steady-state cyclic electron transfer. At low reduction levels of the ubiquinone-0/ubiquinol-0 pool, the total cytochrome c concentration had a major control over the rate of reduction of the primary donor. This control was lost at higher reduction levels of the ubiquinone/ubiquinol-pool, and possible reasons for this behaviour are discussed. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 28]
机译：已在模型能量传导系统中研究了光诱导的循环电子转移的机理，热力学和动力学，该系统由增溶的球形球形红细菌反应中心/收光-1配合物（所谓的核心配合物），马心细胞色素c和泛醌-0 /泛醇-0池。在获得光诱导的稳态电子流后，对泛醇-0还原细胞色素c的稳态动力学的分析表明，该反应的速率主要受泛醇的单电子氧化控制负离子在泛醌-0 /泛醇-0池的不同还原水平下测量了细胞色素c对光氧化反应中心主要供体的还原。这些实验涉及在背景照明之上引发稳态循环电子转移的单周转闪光激发。在泛醌-0 /泛醇-0库的降低水平较低时，总细胞色素c的浓度主要控制了主要供体的降低速度。在较高的泛醌/泛醇池还原水平下失去了这种控制，并讨论了这种行为的可能原因。 （C）2000 Elsevier Science B.V.保留所有权利。 [参考：28]

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