Redox Potential of the Primary Plastoquinone Electron Acceptor QA in Photosystem II from Thermosynechococcus elongatus Determined by Spectroelectrochemistry

被引：57

作者：

Shibamoto, Tadao ^{[1
]}

Kato, Yuki ^{[1
]}

Sugiura, Miwa ^{[2
]}

Watanabe, Tadashi ^{[1
]}

机构：

[1] Univ Tokyo, Inst Ind Sci, Meguro Ku, Tokyo 1538505, Japan

[2] Ehime Univ, Cell Free Sci & Technol Res Ctr, Matsuyama, Ehime 7908577, Japan

来源：

BIOCHEMISTRY | 2009年 / 48卷 / 45期

基金：

日本学术振兴会;

关键词：

SPINACH; COMPLEX; RECOMBINATION; FLUORESCENCE; KINETICS; P700;

D O I：

10.1021/bi901691j

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

The redox potential of the primary plastoquinone electron acceptor Q(A), E-m(Q(A)/Q(A)(-)), in an oxygen-evolging photosystem (PS) 11 complex from a thermophilic cyanobacterium Thermosynechococcus elongatus was determined to be - 140 +/- 2 mV vs. SHE by thin-layer cell spectroclectrochemistry for the first time. The E-m(Q(A)/Q(A)(-)) value obtained here together with the recently determined redox potential of pheophytin (Phe) a [Kato et at. (2009) Proc. Natl. Acad. Sci. U.S.A. 106, 17365-17370] yields -330 to -370 mV for the free energy change by electron transfer from Phe a(-) to Q(A) and provides a renewed picture for the energetics oil the electron acceptor side in PS II.

引用

页码：10682 / 10684

页数：3

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