Metallo-radical hypothesis for photoassembly of (Mn)4-cluster of photosynthetic oxygen evolving complex

被引：32

作者：

Ono, T ^{[1
]}

机构：

[1] Inst Phys & Chem Res, RIKEN Photodynam Ctr, Lab Photobiol, Aoba Ku, Sendai, Miyagi 9800845, Japan

来源：

BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS | 2001年 / 1503卷 / 1-2期

关键词：

photosystem II; oxygen evolution; photoactivation; Mn-cluster; proton abstraction; Y-z tyrosine;

D O I：

10.1016/S0005-2728(00)00226-7

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：

A new hypothetical mechanism is proposed for photoassembly of the (Mn)(4)-cluster of the photosynthetic oxygen evolving complex (OEC). In this process, a neutral radical of Y-Z tyrosine plays a role in oxidizing Mn2+ associated with an apo-OEC, and also in abstracting a proton from a water molecule bound to the Mn2+ ion, together with D1-His190. This is in a similar fashion to the metallo-radical mechanism proposed for photosynthetic water oxidation by the (Mn)(4)-cluster. The model insists that a common mechanism participates in the photoassembly of the (Mn)4-cluster and the photosynthetic water oxidation. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：40 / 51

页数：12

共 110 条

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