在水氧化复合物的各种修饰条件下，光系统II制剂中过氧化氢和超氧阴离子自由基的光生成
Hydrogen Peroxide and Superoxide Anion Radical Photoproduction in PSII Preparations at Various Modifications of the Water-Oxidizing Complex.
作者信息
Khorobrykh Andrey
机构信息
Institute of Basic Biological Problems, FRC PSCBR RAS, Pushchino 142290, Moscow Region, Russia.
出版信息
Plants (Basel). 2019 Sep 5;8(9):329. doi: 10.3390/plants8090329.
The photoproduction of superoxide anion radical (O) and hydrogen peroxide (HO) in photosystem II (PSII) preparations depending on the damage to the water-oxidizing complex (WOC) was investigated. The light-induced formation of O and HO in the PSII preparations rose with the increased destruction of the WOC. The photoproduction of superoxide both in the PSII preparations holding intact WOC and the samples with damage to the WOC was approximately two times higher than HO. The rise of O and HO photoproduction in the PSII preparations in the course of the disassembly of the WOC correlated with the increase in the fraction of the low-potential (LP) Cyt . The restoration of electron flow in the Mn-depleted PSII preparations by exogenous electron donors (diphenylcarbazide, Mn) suppressed the light-induced formation of O and HO. The decrease of O and HO photoproduction upon the restoration of electron transport in the Mn-depleted PSII preparations could be due to the re-conversion of the LP Cyt into higher potential forms. It is supposed that the conversion of the high potential Cyt into its LP form upon damage to the WOC leads to the increase of photoproduction of O and HO in PSII.
研究了光系统II（PSII）制剂中，取决于水氧化复合物（WOC）损伤情况的超氧阴离子自由基（O）和过氧化氢（HO）的光生成。PSII制剂中O和HO的光诱导形成随着WOC破坏程度的增加而增加。在WOC保持完整的PSII制剂和WOC受损的样品中，超氧的光生成均比HO高出约两倍。在WOC拆解过程中，PSII制剂中O和HO光生成的增加与低电位（LP）细胞色素比例的增加相关。通过外源电子供体（二苯基卡巴肼、锰）恢复锰耗尽的PSII制剂中的电子流，抑制了O和HO的光诱导形成。锰耗尽的PSII制剂中电子传递恢复后，O和HO光生成的减少可能是由于LP细胞色素重新转化为更高电位形式。据推测，WOC受损时高电位细胞色素转化为其LP形式会导致PSII中O和HO光生成增加。
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