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关于嗜色菌电子传递系统中光诱导氧化反应的观察

Observations on light-induced oxidation reactions in the electron transport system of Chromatium.

作者信息

Kennel S J, Bartsch R G, Kamen M D

出版信息

Biophys J. 1972 Jul;12(7):882-96. doi: 10.1016/S0006-3495(72)86131-9.

DOI:10.1016/S0006-3495(72)86131-9
PMID:5037342
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC1484255/
Abstract

Light-induced cytochrome oxidations in Chromatium subchromatophore particles were studied in detail. These reactions were found to be dependent not only on redox potential, but also on the efficiency of coupling of the redox buffer electrons to the cytochrome system. Light-induced oxidation of the high potential cytochrome (c-556) was dependent on (a) the availability of reduced cytochrome and (b) the rate of light-induced oxidation (as determined by light intensity) vs. rate of cytochrome rereduction. Chromatium high potential iron-sulfur protein ("HiPISP") enhanced the rate of c-556 rereduction by mediating electron flow from artificial redox buffers to c-556. In these experiments, the light-induced oxidation of the low potential cytochrome (c-552.5) is dependent not only on the above parameters, but also on the rate of oxidation of the primary electron acceptor X. The interactions of purified Chromatium cytochromes with the light-induced cytochrome oxidation system are discussed.

摘要

对嗜色菌亚色素颗粒中光诱导的细胞色素氧化进行了详细研究。发现这些反应不仅取决于氧化还原电位，还取决于氧化还原缓冲电子与细胞色素系统的偶联效率。高电位细胞色素（c-556）的光诱导氧化取决于（a）还原型细胞色素的可用性，以及（b）光诱导氧化速率（由光强度决定）与细胞色素再还原速率之比。嗜色菌高电位铁硫蛋白（“HiPISP”）通过介导电子从人工氧化还原缓冲液流向c-556，提高了c-556的再还原速率。在这些实验中，低电位细胞色素（c-552.5）的光诱导氧化不仅取决于上述参数，还取决于初级电子受体X的氧化速率。讨论了纯化的嗜色菌细胞色素与光诱导细胞色素氧化系统的相互作用。

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