The PsbP-like protein (sll1418) of Synechocystis sp. PCC 6803 stabilises the donor side of Photosystem II

• 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 S3QB− couple becoming the major species instead of the S2QB−. 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.

Nyckelord

Photosynthesis

Photosystem II

Oxygen evolution

Extrinsic proteins

Manganese cluster

PsbP

Synechocystis sp. PCC 6803

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