O2 reduction by photosystem I involves phylloquinone under steady-state illumination
O2 reduction by photosystem I involves phylloquinone under steady-state illumination
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DOI：
10.1016/j.febslet.2014.10.003
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发表时间：
2014-11-28
期刊：
影响因子：
3.5
通讯作者：
Ivanov, Boris N.
中科院分区：
文献类型：
--
作者：
Kozuleva, Marina A.;Petrova, Anastasia A.;Ivanov, Boris N.
研究了从蓝细菌集胞藻PCC 6803野生型（WT）和menB突变株中分离的光系统I（PS I）复合物中的O-2还原，所述突变株不能合成叶绿醌并且在醌结合位点A处含有质体醌（1）。野生型和menB突变体PS I复合物的O-2还原对光强的依赖性不同，即野生型PS I复合物的O-2还原速率在高光强下没有达到饱和，而menB突变体PS I复合物的O-2还原速率在高光强下没有达到饱和。所获得的结果表明叶绿醌直接参与光诱导的O-2还原PS I。(C)2014年欧洲生物化学学会联合会。Elsevier B. V.出版，保留所有权利。
O-2 reduction was investigated in photosystem I (PS I) complexes isolated from cyanobacteria Synechocystis sp. PCC 6803 wild type (WT) and menB mutant strain, which is unable to synthesize phylloquinone and contains plastoquinone at the quinone-binding site A(1). PS I complexes from WT and menB mutant exhibited different dependencies of O-2 reduction on light intensity, namely, the values of O-2 reduction rate in WT did not reach saturation at high intensities, in contrast to the values in menB mutant. The obtained results suggest the immediate phylloquinone involvement in the light-induced O-2 reduction by PS I. (C) 2014 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.