Water-splitting manganese complex controls light-induced redox changes of cytochrome b 559 in Photosystem II

被引：8
|
作者：
Sinha, Rakesh Kumar [1 ]
Tiwari, Arjun [1 ]
Pospisil, Pavel [1 ]
机构：
[1] Palacky Univ, Fac Sci, Dept Expt Phys, Biophys Lab, Olomouc 77146, Czech Republic
来源：
JOURNAL OF BIOENERGETICS AND BIOMEMBRANES | 2010年 / 42卷 / 04期
关键词：
Cytochorome b(559); Photosystem II; Redox potential; Water-splitting manganese complex; HIGH-POTENTIAL FORM; ELECTRON-TRANSFER; OXYGEN; B559; RESTORATION; RESOLUTION; MECHANISM; EVOLUTION; OXIDATION; B(559);
D O I：
10.1007/s10863-010-9299-2
中图分类号：
Q6 [生物物理学];
学科分类号：
071011 ;
摘要：
The effect of water-splitting Mn complex on light-induced redox changes of cytochrome b (559) (cyt b (559)) was studied in spinach photosystem II (PSII) membranes. Photoreduction of the heme iron in the intact PSII membranes was completely suppressed by DCMU, whereas photoreduction and photooxidation of the heme iron in the Mn-depleted PSII membranes were unaffected by DCMU. Interesingly, photoreduction and photooxidation of the heme iron in the Mn-depleted PSII membranes were completely diminished by exogenous superoxide dismutase (SOD), whereas no effect of SOD on photoreduction of the heme iron was observed in the intact PSII membranes. The current work shows that the light-induced redox changes of cyt b (559) proceed via a different mechanism in the both types of PSII membranes. In the intact PSII membranes, photoreduction of the heme iron is mediated by plastoquinol. However, in the Mn-depleted PSII membranes, photoreduction and photooxidation of the heme iron are mediated by superoxide anion radical formed in PSII.
引用
收藏
页码：337 / 344
页数：8
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