BIOCHEMICAL-EVIDENCE FOR HISTIDINE OXIDATION IN PHOTOSYSTEM-II DEPLETED OF THE MN-CLUSTER FOR O-2-EVOLUTION

被引：61

作者：

ONO, T

INOUE, Y

机构：

[1] Solar Energy Research Group, The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama

来源：

FEBS LETTERS | 1991年 / 278卷 / 02期

关键词：

HISTIDINE OXIDATION; PHOTOSYSTEM-II; MN CLUSTER; TRIS TREATMENT; O-2; EVOLUTION;

D O I：

10.1016/0014-5793(91)80112-G

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：

Flash excitation of Tris-treated photosystem II (PSII) membranes generated a thermoluminescence band peaking at -20-degrees-C, indicating that a positively charged oxidizing equivalent is stably accumulated on donor side of PSII even in the absence of the Mn-cluster. This oxidizing equivalent was sensitive to low concentrations of exogenous Mn2+, and its stable accumulation was reversibly inhibited by diethylpyrocarbonate treatment that modifies histidine residues with high specificity. It was inferred that there is a photooxidizable histidine residue(s) on donor side of PSII and it provides a redox-active ligand for Mn.

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页码：183 / 186

页数：4

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