光系统II水氧化复合物中Mn4Ca簇的X射线光谱学。
X-ray spectroscopy of the Mn4Ca cluster in the water-oxidation complex of Photosystem II.
作者信息
Sauer Kenneth, Yano Junko, Yachandra Vittal K
机构信息
Department of Chemistry, University of California, Berkeley, CA 94720-1460, USA.
出版信息
Photosynth Res. 2005;85(1):73-86. doi: 10.1007/s11120-005-0638-9.
Abstract
The water-oxidation complex of Photosystem II (PS II) contains a heteronuclear cluster of 4 Mn atoms and a Ca atom. Ligands to the metal cluster involve bridging O atoms, and O and N atoms from amino acid side-chains of the D1 polypeptide of PS II, with likely additional contributions from water and CP43. Although moderate resolution X-ray diffraction-based structures of PS II have been reported recently, and the location of the Mn4Ca cluster has been identified, the structures are not resolved at the atomic level. X-ray absorption (XAS), emission (XES), resonant inelastic X-ray scattering (RIXS) and extended X-ray absorption fine structure (EXAFS) provide independent and potentially highly accurate sources of structural and oxidation-state information. When combined with polarized X-ray studies of oriented membranes or single-crystals of PS II, a more detailed picture of the cluster and its disposition in PS II is obtained.
摘要
光系统II（PS II）的水氧化复合物包含一个由4个锰原子和1个钙原子组成的异核簇。金属簇的配体包括桥连氧原子，以及来自PS II的D1多肽氨基酸侧链的氧原子和氮原子，水和CP43可能也有额外贡献。尽管最近已经报道了基于中等分辨率X射线衍射的PS II结构，并且已经确定了Mn4Ca簇的位置，但这些结构在原子水平上尚未解析。X射线吸收（XAS）、发射（XES）、共振非弹性X射线散射（RIXS）和扩展X射线吸收精细结构（EXAFS）提供了独立且可能高度准确的结构和氧化态信息来源。当与对PS II定向膜或单晶的偏振X射线研究相结合时，就能获得该簇及其在PS II中排列的更详细图像。
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