title: The PsbP-like protein (sll1418) of Synechocystis sp. PCC 6803 stabilises the donor side of Photosystem II.
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.
authors.affiliation: Department of Chemistry, Umeå University, 90187 Umeå, Sweden.
authors.forename: Dmitry
authors.initials: D
authors.lastname: Sveshnikov
authors.forename: Christiane
authors.initials: C
authors.lastname: Funk
authors.forename: Wolfgang P
authors.initials: WP
authors.lastname: Schröder
mesh_terms: D001426:Bacterial Proteins / Q000378:metabolism*; D005798:Genes, Bacterial; D008027:Light; D050505:Mutant Proteins / Q000378:metabolism; D009154:Mutation / Q000235:genetics; D010100:Oxygen / Q000378:metabolism; D010641:Phenotype; D010788:Photosynthesis / Q000528:radiation effects; D045332:Photosystem II Protein Complex / Q000378:metabolism*; D046939:Synechocystis / Q000235:genetics / Q000254:growth & development / Q000378:metabolism* / Q000528:radiation effects; D013816:Thermodynamics
chemical_list: D001426:Bacterial Proteins; D050505:Mutant Proteins; D045332:Photosystem II Protein Complex; D010100:Oxygen