Disorganization of the Mn4Ca complex of photosystem II by ruthenium red: a thermoluminescence study |
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| Authors: | Alain Gauthier Robert Carpentier |
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| Institution: | Groupe de Recherche en Biologie Végétale (GRBV), Université du Québec à Trois‐Rivières, C.P. 500 Trois‐Rivières, Québec, Canada G9A 5H7 |
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| Abstract: | Ruthenium red (RR) is known to be an inhibitor that binds to Ca2+ sites. It releases Ca2+ and Cl? together with the extrinsic polypeptide of 17 kDa associated with the oxygen evolving complex of photosystem II. In this work we used thermoluminescence to study S2/3QB? and S2QA? charge recombination. It is shown that RR produced a deeper inhibition of oxygen evolution compared with the effect of extrinsic polypeptide or Ca2+/Cl? depletion. Even though Mn is not released, the Mn cluster is disorganized by RR and the S1 → S2 transition is inhibited. Copyright © 2008 John Wiley & Sons, Ltd. |
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| Keywords: | photosystem II thermoluminescence Mn cluster Ruthenium red PSII inhibition |
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