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.
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页码:40 / 51
页数:12
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