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Manganese-histidine cluster as the functional center of the water oxidation complex in photosynthesis

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Abstract

The recent model of Kambara and Govindjee for water oxidation [Kambara T. and Govindjee (1985) Proc. Natl. Acad. Sci. U.S.A., 82:6119–6123] has been extended in this paper by examining all the data in order to identify the most likely candidate for the ‘redox-active ligand’ (RAL), suggested to operate between the water oxidizing complex (WOC) and Z, the electron donor to the reaction center P680. We have concluded that a very suitable candidate for RAL is the imidazole moiety of a histidine residue. The electrochemical data available on imidazole derivatives play heavily in this identification of RAL. Thus, we suggest that histidine might play the role of an electron mediator between the WOC and Z. A model of S-states in terms of their plausible chemical identity is presented here.

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Abbreviations

J:

electronic spin of ion

P680:

reaction center chlorophyll

RAL:

Redox active ligand

Sn :

state of the oxygen-evolving system

WOC:

water oxidation complex

Z:

electron donor to P680

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Dedicated to Prof. L.N.M. Duysens on the occasion of his retirement

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Padhye, S., Kambara, T., Hendrickson, D.N. et al. Manganese-histidine cluster as the functional center of the water oxidation complex in photosynthesis. Photosynth Res 9, 103–112 (1986). https://doi.org/10.1007/BF00029736

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  • DOI: https://doi.org/10.1007/BF00029736

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