The PsbP-like protein (sll1418) of Synechocystis sp. PCC 6803 stabilises the donor side of Photosystem II |
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Authors: | Dmitry Sveshnikov Christiane Funk Wolfgang P. Schröder |
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Affiliation: | 1. Department of Chemistry, Ume? University, 901 87, Ume?, Sweden
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Abstract: | The PsbP-like protein of the cyanobacterium Synechocystis sp. PCC 6803 is a peripheral component of Photosystem II, located at the lumenal side of the thylakoid membrane. Removal of this protein leads to decreased competitive potential of a PsbP-like deletion mutant when grown in a mixture with wild-type cells. Flash-induced oxygen evolution traces of the mutant show a higher probability of misses, correlated with increased amplitudes of the S-states decay in the dark. Thermoluminescence emission traces demonstrate a changed charge recombination pattern in the mutant, the S(3)Q(B)(-) couple becoming the major species instead of the S(2)Q(B)(-). Our data suggest a possible role of the PsbP-like protein in stabilisation of the charge separation in Photosystem II of cyanobacteria through interaction with the Mn cluster. |
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Keywords: | Photosynthesis Photosystem II Oxygen evolution Extrinsic proteins Manganese cluster PsbP Synechocystis sp. PCC 6803 |
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