A light-induced reduction of the water-soluble nitroxide radical by chlorophyll in lipid and protein--lipid micelles was demonstrated. In contrast to model systems, in whole chloroplasts the NR is photoreduced by the electrons of the noncyclic electron transport chain. The initiation of cyclic electron transport in light particles, containing only photosystem I, does not lead to photoreduction of NR. When exogenous protein -- human serum albumin -- is added to the light particles, the nitroxide radicals are intensively reduced. The specific role of protein in electron transport from P700 to the exogenous acceptor is discussed.

中文翻译：

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用ESR方法研究叶绿体及其碎片中的电子传输。二。水溶性氮氧化物自由基与叶绿体和含叶绿素的蛋白质-脂质微团的光诱导相互作用。

证明了脂质和蛋白质-脂质胶束中的叶绿素可光诱导水溶性氮氧自由基的还原。与模型系统相比，在整个叶绿体中，NR被非环状电子传输链的电子光还原。仅包含光系统I的光粒子中循环电子传输的启动不会导致NR的光还原。当将外源蛋白质-人血清白蛋白-添加到轻粒子中时，氮氧化物自由基会大量还原。讨论了蛋白质在电子从P700传递到外源受体中的特定作用。