Abstract
The primary reactants in photosynthesis are defined as the chemical entities on which charges are generated and stabilized after capture of a photon by the photochemical trap: PIX hv→ P * IX → P + I − X→ P + IX −, where P stands for the primary electron donor, P * for its excited singlet state, I for the ‘first’ (ESR-detectable) electron acceptor and X for the secondary acceptor complex. The ESR and ENDOR experiments which have played a rÔle in the identification and characterization of P, I, and X in the bacterial and plant photosystems are comprehensively reviewed. The structural and kinetic information obtained with magnetic resonance techniques are integrated with results obtained with optical spectroscopy to give a unified picture of the pathway of primary photochemistry in photosynthesis.
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Nomenclature of Primary Reactants
In the interest of uniformity this review introduces a nomenclature of the primary reactants that deviates in some respects from the commonly used labels. The nametags used here and listed below are abbreviations of the molecules that are identified as primary reactants, with the exception of the donors, for which I have retained the commonly accepted designation. Photosystems: PS 1, photosystem 1 of plants; PS 2, photosystem 2 of plants; pBPS, the photosystem of purple bacteria; gBPS, ditto of green bacteria. P: Primary donors: P700 (PS 1), P680 (PS 2), P860 (generic label for BChl a containing purple bacteria), P960 (generic label for BChl b containing purple bacteria), P840 (generic name for green bacteria). I: ‘First’ acceptors: Chl a (PS 1), Ph a (PS 2), BPh a,b (pBPS). X: Secondary acceptors: F x (PS 1), pQ 1 (PS 2), uQ 1 or mQ 1 (pBPS), B (gBPS). Tertiary acceptors: F A,B (PS 1), pQ 2 (PS 2), uQ 2 (pBPS), F 1 (gBPS).
This paper is based on a lecture given at the Joint Meeting of the Belgium, German (FRG), and Netherlands Societies for Biophysics, Aachen 1980
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Hoff, A.J. ESR and ENDOR of primary reactants in photosynthesis. Biophys. Struct. Mechanism 8, 107–150 (1982). https://doi.org/10.1007/BF00535455
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DOI: https://doi.org/10.1007/BF00535455