| Literature DB >> 15977060 |
Kenneth Sauer1, Junko Yano, Vittal K Yachandra.
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.Entities:
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Year: 2005 PMID： 15977060 PMCID： PMC3962501 DOI： 10.1007/s11120-005-0638-9
Source DB: PubMed Journal: Photosynth Res ISSN： 0166-8595 Impact factor: 3.573