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UniProt functional annotation for Q9F1L5 | ||
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| UniProt code: Q9F1L5. |
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| Organism: | |
Thermosynechococcus elongatus (strain BP-1). |
| Taxonomy: | |
Bacteria; Cyanobacteria; Synechococcales; Synechococcaceae; Thermosynechococcus. |
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| Function: | |
Stabilizes the structure of photosystem II oxygen-evolving complex (OEC), the ion environment of oxygen evolution and protects the OEC against heat-induced inactivation. 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:0000255|HAMAP-Rule:MF_00589, ECO:0000269|PubMed:20558739, ECO:0000269|PubMed:21367867, ECO:0000269|PubMed:25006873}. |
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| Cofactor: | |
Note=PSII binds multiple chlorophylls, carotenoids and specific lipids. {ECO:0000255|HAMAP-Rule:MF_00589, ECO:0000269|PubMed:14764885, ECO:0000269|PubMed:16355230, ECO:0000269|PubMed:17935689, ECO:0000269|PubMed:19219048, ECO:0000269|PubMed:20558739, ECO:0000269|PubMed:21367867, ECO:0000269|PubMed:22665786, ECO:0000269|PubMed:23413188, ECO:0000269|PubMed:25006873, ECO:0000269|PubMed:25043005}; |
| Subunit: | |
The cyanobacterial oxygen-evolving complex is composed of PsbO, PsbP, PsbQ, PsbV and PsbU. PsbP and PsbQ are not seen in the crystal structures; however there is biochemical evidence that they are part of the OEC (By similarity). 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:0000250, ECO:0000269|PubMed:14764885, ECO:0000269|PubMed:16355230, ECO:0000269|PubMed:19219048, ECO:0000269|PubMed:20558739, ECO:0000269|PubMed:21367867, ECO:0000269|PubMed:22665786, ECO:0000269|PubMed:23413188, ECO:0000269|PubMed:25006873, ECO:0000269|PubMed:25043005}. |
| Subcellular location: | |
Cellular thylakoid membrane {ECO:0000255|HAMAP- Rule:MF_00589, ECO:0000269|PubMed:14764885, ECO:0000269|PubMed:17935689, ECO:0000269|PubMed:20558739, ECO:0000269|PubMed:21367867, ECO:0000269|PubMed:22665786, ECO:0000269|PubMed:23413188, ECO:0000269|PubMed:25006873, ECO:0000269|PubMed:25043005}; Peripheral membrane protein {ECO:0000255|HAMAP-Rule:MF_00589, ECO:0000269|PubMed:14764885, ECO:0000269|PubMed:16355230, ECO:0000269|PubMed:17935689, ECO:0000269|PubMed:19219048, ECO:0000269|PubMed:20558739, ECO:0000269|PubMed:21367867, ECO:0000269|PubMed:22665786, ECO:0000269|PubMed:23413188, ECO:0000269|PubMed:25006873, ECO:0000269|PubMed:25043005}; Lumenal side {ECO:0000255|HAMAP- Rule:MF_00589, ECO:0000269|PubMed:14764885, ECO:0000269|PubMed:16355230, ECO:0000269|PubMed:17935689, ECO:0000269|PubMed:19219048, ECO:0000269|PubMed:20558739, ECO:0000269|PubMed:21367867, ECO:0000269|PubMed:22665786, ECO:0000269|PubMed:23413188, ECO:0000269|PubMed:25006873, ECO:0000269|PubMed:25043005}. Note=Associated with photosystem II at the lumenal side of the thylakoid membrane. |
| Mass spectrometry: | |
Mass=11649; Mass_error=8; Method=MALDI; Evidence={ECO:0000269|PubMed:19219048}; |
| Mass spectrometry: | |
Mass=11641; Method=MALDI; Evidence={ECO:0000269|PubMed:20558739}; |
| Similarity: | |
Belongs to the PsbU family. {ECO:0000255|HAMAP- Rule:MF_00589}. |
Annotations taken from UniProtKB at the EBI.