Reorganization of Substrate Waters between the Closed and Open Cubane Conformers during the S2 to S3 Transition in the Oxygen Evolving Complex

被引：66

作者：

Capone, Matteo ^{[1
]}

Bovi, Daniele ^{[2
]}

Narzi, Daniele ^{[2
]}

Guidoni, Leonardo ^{[2
]}

机构：

[1] Univ Roma La Sapienza, Dipartimento Chim, I-00185 Rome, Italy

[2] Univ Aquila, Dipartimento Sci Fis & Chim, I-67100 Laquila, Italy

来源：

BIOCHEMISTRY | 2015年 / 54卷 / 42期

基金：

欧洲研究理事会;

关键词：

O BOND FORMATION; PHOTOSYSTEM-II; MANGANESE COMPLEX; RESOLUTION; OXIDATION; EXCHANGE; BINDING; CONVERSION; STATE; MECHANISM;

D O I：

10.1021/acs.biochem.5b00782

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 crucial step in the mechanism for oxygen evolution in the Photosystem II complex resides in the transition from the S-2 state to the S-3 state of Kok-Joliot's cycle, in which an additional water molecule binds to the cluster. On the basis of computational chemistry calculations on Photosystem II models, we propose a reorganization mechanism involving a hydroxyl (W2) and a mu(2)-oxo bridge (O5) that is able to link the closed cubane S-2(B) intermediate conformer to the S-3 open cubane structure. This mechanism can reconcile the apparent conflict between recently reported water exchange and electron paramagnetic resonance experiments, and theoretical studies.

引用

页码：6439 / 6442

页数：4

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