Spectroelectrochemistry of cytochrome b559 in the D1-D2-Cyt b559 complex from spinach

被引：17

作者：

Shibamoto, Tadao ^{[1
]}

Kato, Yuki ^{[1
]}

Watanabe, Tadashi ^{[1
]}

机构：

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

来源：

FEBS LETTERS | 2008年 / 582卷 / 10期

基金：

日本学术振兴会;

关键词：

photosystem II; redox potential; cytochrome b559; low-potential form; photosynthesis;

D O I：

10.1016/j.febslet.2008.03.041

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 cytochrome b559 (Cyt b559) in the D1-D2-Cyt b559 complex from spinach has been determined to be +90 +/- 2 mV vs. SHE at pH 6.0, by thin-layer cell spectroelectrochemistry for the first time. The redox potential, corresponding uniquely to the so-called "low-potential form", exhibited a sigmoidal pH-dependence from pH 4.0 to 9.0, ranging from +115 to +50 mV. An analysis of the pH-dependence based on model equations suggests that two histidine residues coordinating to the heme iron in the protein subunits may exert electrostatic influence on the redox potential of Cyt b559. (C) 2008 Federation of European Biochemical Societies. Published by Elsevier B. V. All rights reserved.

引用

页码：1490 / 1494

页数：5

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