Organization of the Photosystem II Reaction Center
The efficient energy transformation in the primary process of photosynthesis is ensured by the highly ordered organization of photochemical reaction centers, in physical, chemical and biological sense. In photosystem II (PSII), the primary charge separation takes place in a pigment-protein complex consisted of D1 and D2 proteins and some other components, which has recently been isolated and the chemical and physical properties have been analyzed1-4. Present article deals with the organization of PSII reaction center in two aspects. In the first part, the basic chemical architecture of the isolated PSII reaction center will be described. This includes stoichiometries of protein subunits and of pigments and redox cofactors. In the second part, the discussion will be focussed on some aspects of light-regulated turnover of D1 subunit of the PSII reaction center, which include the mechanism of light-regulated synthesis of D1 protein in isolated chloroplasts and the characterization of an enzyme involved in the C-terminal processing of D1 precursor protein.
KeywordsReaction Center Complex Primary Charge Separation Primary Photochemistry Redox Cofactor Actinic Light Intensity
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