Manganese-histidine cluster as the functional center of the water oxidation complex in photosynthesis |
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| Authors: | Subhash Padhye Takeshi Kambara David N Hendrickson Govindjee |
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| Institution: | (1) 352 Noyes Laboratory, School of Chemical Sciences, University of Illinois at Urbana-Champaign, 505 S. Mathews, 61801 Urbana, IL, USA;(2) Department of Physiology and Biophysics, and Plant Biology, University of Illinois at Urbana-Champaign, 289 Morrill Hall, 505 S. Goodwin Avenue, 61801 Urbana, IL, USA;(3) Present address: Department of Chemistry, University of Poona, 411 007 Poona, India;(4) Present address: Department of Engineering Physics, University of Electro-Communications, 182 Chofu, Tokyo, Japan |
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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.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
Dedicated to Prof. L.N.M. Duysens on the occasion of his retirement |
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| Keywords: | oxygen evolution model manganese-histidine complex |
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