UniProt functional annotation for P56152



	UniProt functional annotation for P56152

UniProt code: P56152.

Organism: Thermosynechococcus vulcanus (Synechococcus vulcanus).

Taxonomy: Bacteria; Cyanobacteria; Synechococcales; Synechococcaceae; Thermosynechococcus.

Function: Stabilizes the structure of photosystem II (PSII) oxygen- evolving complex (OEC), the ion environment of oxygen evolution and protects the OEC against heat-induced inactivation. Requires cytochrome c-550 (PsbV) or OEC3 (PsbO) to bind to photosystem II (PSII). PSII is a light-driven water plastoquinone oxidoreductase, using light energy to abstract electrons from H(2)O, generating a proton gradient subsequently used for ATP formation. {ECO:0000269|PubMed:1314738, ECO:0000269|PubMed:19433803, ECO:0000269|PubMed:23426624}.

Cofactor: Note=PSII binds multiple chlorophylls, carotenoids and specific lipids. {ECO:0000269|PubMed:12518057, ECO:0000269|PubMed:19433803, ECO:0000269|PubMed:21499260, ECO:0000269|PubMed:23426624};

Subunit: With PsbO,P,Q and V forms the oxygen-evolving complex of photosystem II (Probable). Cyanobacterial PSII is composed of 1 copy each of membrane proteins PsbA, PsbB, PsbC, PsbD, PsbE, PsbF, PsbH, PsbI, PsbJ, PsbK, PsbL, PsbM, PsbT, PsbX, PsbY, PsbZ, Ycf12, 3 peripheral proteins PsbO, PsbU, PsbV and a large number of cofactors. It forms dimeric complexes. {ECO:0000269|PubMed:12461137, ECO:0000269|PubMed:12518057, ECO:0000269|PubMed:1314738, ECO:0000269|PubMed:19433803, ECO:0000269|PubMed:21499260, ECO:0000269|PubMed:23426624, ECO:0000269|PubMed:8397205}.

Subcellular location: Cellular thylakoid membrane {ECO:0000269|PubMed:12518057, ECO:0000269|PubMed:19433803, ECO:0000269|PubMed:21499260, ECO:0000269|PubMed:23426624}; Peripheral membrane protein {ECO:0000269|PubMed:12518057, ECO:0000269|PubMed:19433803, ECO:0000269|PubMed:21499260, ECO:0000269|PubMed:23426624}; Lumenal side {ECO:0000269|PubMed:12518057, ECO:0000269|PubMed:19433803, ECO:0000269|PubMed:21499260, ECO:0000269|PubMed:23426624}. Note=Associated with photosystem II at the lumenal side of the thylakoid membrane.

Similarity: Belongs to the PsbU family. {ECO:0000305}.

Annotations taken from UniProtKB at the EBI.


Organism:		Thermosynechococcus vulcanus (Synechococcus vulcanus).
Taxonomy:		Bacteria; Cyanobacteria; Synechococcales; Synechococcaceae; Thermosynechococcus.



Function:		Stabilizes the structure of photosystem II (PSII) oxygen- evolving complex (OEC), the ion environment of oxygen evolution and protects the OEC against heat-induced inactivation. Requires cytochrome c-550 (PsbV) or OEC3 (PsbO) to bind to photosystem II (PSII). PSII is a light-driven water plastoquinone oxidoreductase, using light energy to abstract electrons from H(2)O, generating a proton gradient subsequently used for ATP formation. {ECO:0000269\|PubMed:1314738, ECO:0000269\|PubMed:19433803, ECO:0000269\|PubMed:23426624}.


Cofactor:		Note=PSII binds multiple chlorophylls, carotenoids and specific lipids. {ECO:0000269\|PubMed:12518057, ECO:0000269\|PubMed:19433803, ECO:0000269\|PubMed:21499260, ECO:0000269\|PubMed:23426624};
Subunit:		With PsbO,P,Q and V forms the oxygen-evolving complex of photosystem II (Probable). Cyanobacterial PSII is composed of 1 copy each of membrane proteins PsbA, PsbB, PsbC, PsbD, PsbE, PsbF, PsbH, PsbI, PsbJ, PsbK, PsbL, PsbM, PsbT, PsbX, PsbY, PsbZ, Ycf12, 3 peripheral proteins PsbO, PsbU, PsbV and a large number of cofactors. It forms dimeric complexes. {ECO:0000269\|PubMed:12461137, ECO:0000269\|PubMed:12518057, ECO:0000269\|PubMed:1314738, ECO:0000269\|PubMed:19433803, ECO:0000269\|PubMed:21499260, ECO:0000269\|PubMed:23426624, ECO:0000269\|PubMed:8397205}.
Subcellular location:		Cellular thylakoid membrane {ECO:0000269\|PubMed:12518057, ECO:0000269\|PubMed:19433803, ECO:0000269\|PubMed:21499260, ECO:0000269\|PubMed:23426624}; Peripheral membrane protein {ECO:0000269\|PubMed:12518057, ECO:0000269\|PubMed:19433803, ECO:0000269\|PubMed:21499260, ECO:0000269\|PubMed:23426624}; Lumenal side {ECO:0000269\|PubMed:12518057, ECO:0000269\|PubMed:19433803, ECO:0000269\|PubMed:21499260, ECO:0000269\|PubMed:23426624}. Note=Associated with photosystem II at the lumenal side of the thylakoid membrane.
Similarity:		Belongs to the PsbU family. {ECO:0000305}.