title: A model for the water-oxidation and recovery systems of the oxygen-evolving complex.
abstract: We propose a model for the water-oxidation and recovery systems of the oxygen-evolving complex (OEC) of the photosystem II (PSII) enzyme. The whole system is constructed from two catalytic cycles, conducted as a tandem reaction: (i) a water-oxidation loop uses cerium(IV) ammonium nitrate as an oxidant to activate a dimanganese complex for water-oxidation and thereby liberate a molecule of O2 and (ii) a recovery loop begins with photoinhibition of the dimanganese complex but then uses O2 to reactivate the manganese centre. The net result is a catalytic water-oxidation catalyst that can use self-generated O2 for recovery.
authors: International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan. ogotcm@mail.cstm.kyushu-u.ac.jp.
authors: Takeshi
authors: T
authors: Yatabe
authors: Mitsuhiro
authors: M
authors: Kikkawa
authors: Takahiro
authors: T
authors: Matsumoto
authors: Hidetaka
authors: H
authors: Nakai
authors: Kenji
authors: K
authors: Kaneko
authors: Seiji
authors: S
authors: Ogo
mesh_terms: D055162:Biocatalysis; D056831:Coordination Complexes / Q000737:chemistry; D018360:Crystallography, X-Ray; D008345:Manganese / Q000737:chemistry; D008968:Molecular Conformation; D009566:Nitrates / Q000737:chemistry; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*; D045332:Photosystem II Protein Complex / Q000737:chemistry / Q000378:metabolism*; D014867:Water / Q000737:chemistry*
chemical_list: D056831:Coordination Complexes; D009566:Nitrates; D045332:Photosystem II Protein Complex; D014867:Water; D008345:Manganese; D010100:Oxygen; C006568:ammonium nitrate