球形红假单胞菌光合反应中心的光化学电子传递。3. 邻菲啰啉和其他化学物质的影响。
Photochemical electron transport oin photosynthetic reaction centers from Rhodopseudomonas spheroides. 3. Effects of orthophenanthroline and other chemicals.
作者信息
Clayton R K, Szuts E Z, Fleming H
出版信息
Biophys J. 1972 Jan;12(1):64-79. doi: 10.1016/s0006-3495(72)86071-5.
Abstract
Reaction centers from Rhodopseudomonas spheroides mediate the photochemical oxidation of cytochrome c (cyt c), and show a time-varying fluorescence of P870. Analyses of these effects indicate that the reaction centers contain a primary photochemical electron acceptor capable of holding one electron. Native or added ubiquinone (UQ) can act as a secondary electron acceptor. Orthophenanthroline (o-phen) blocks electron transfer from primary to secondary acceptors, and allows the primary acceptor to be exhibited in the foregoing experiments. Other chelators (with the possible exception of 8-hydroxyquinoline) and dichlorophenyldimethylurea (DCMU) are without apparent effect on reaction centers. o-Phen also inhibits the primary photochemical act in reaction centers; this effect is prevented by the presence of UQ. 2-n-Nonyl-4-hydroxyquinoline-N-oxide (NQNO) inhibits the primary photochemistry in reaction centers but does not affect secondary electron transfer.
摘要
球形红假单胞菌的反应中心介导细胞色素c（cyt c）的光化学氧化，并呈现P870随时间变化的荧光。对这些效应的分析表明，反应中心含有一个能够容纳一个电子的初级光化学电子受体。天然的或添加的泛醌（UQ）可作为次级电子受体。邻菲罗啉（o-phen）阻断从初级受体到次级受体的电子转移，并使初级受体在上述实验中得以展现。其他螯合剂（8-羟基喹啉可能除外）和二氯苯基二甲基脲（DCMU）对反应中心无明显影响。o-phen也抑制反应中心的初级光化学作用；UQ的存在可防止这种效应。2-n-壬基-4-羟基喹啉-N-氧化物（NQNO）抑制反应中心的初级光化学，但不影响次级电子转移。
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