S1-state model of the O2-evolving complex of photosystem II.

S1-state model of the O2-evolving complex of photosystem II.
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DOI:
10.1021/bi200681q
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发表时间:
2011-07-26
期刊:
影响因子:
2.9
通讯作者:
Batista, Victor S.
Batista, Victor S.
中科院分区:
生物学3区
文献类型:
--
作者:
Luber, Sandra;Rivalta, Ivan;Umena, Yasufumi;Kawakami, Keisuke;Shen, Jian-Ren;Kamiya, Nobuo;Brudvig, Gary W.;Batista, Victor S.

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基于最近报道的1.9 Å分辨率的x射线衍射(XRD)新模型,我们介绍了S1 Mn4(IV, III, IV, III)状态下光系统II的出氧配合物(OEC)的量子力学/分子力学模型,其中Ca2+通过D170和A344的羧酸基团桥接到锰中心。该模型与高分辨率光谱数据(包括取向单晶的偏振扩展x射线吸收精细结构数据)一致。我们的结果提供了Mn簇内精细的金属间距离,并表明XRD模型很可能对应于氧化态的混合物,包括比在水分解催化循环中观察到的更多的还原物质。
We introduce a Quantum Mechanics/Molecular Mechanics model of the oxygen-evolving complex (OEC) of photosystem II in the S1 Mn4(IV, III, IV, III) state, where Ca2+ is bridged to manganese centers by the carboxylate moieties of D170 and A344 based on the new X-ray diffraction (XRD) model recently reported at 1.9 Å resolution. The model is also consistent with high-resolution spectroscopic data, including polarized extended X-ray absorption fine structure data of oriented single crystals. Our results provide refined intermetallic distances within the Mn cluster and suggest that the XRD model most likely corresponds to a mixture of oxidation states, including more reduced species than observed in the catalytic cycle of water splitting.
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