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UniProt functional annotation for P07753 | ||
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| UniProt code: P07753. |
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| Organism: | |
Chlamydomonas reinhardtii (Chlamydomonas smithii). |
| Taxonomy: | |
Eukaryota; Viridiplantae; Chlorophyta; core chlorophytes; Chlorophyceae; CS clade; Chlamydomonadales; Chlamydomonadaceae; Chlamydomonas. |
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| Function: | |
This is one of the two reaction center proteins of photosystem II. |
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| Function: | |
Photosystem II (PSII) is a light-driven water:plastoquinone oxidoreductase that uses light energy to abstract electrons from H(2)O, generating O(2) and a proton gradient subsequently used for ATP formation. It consists of a core antenna complex that captures photons, and an electron transfer chain that converts photonic excitation into a charge separation. The D1/D2 (PsbA/PsbA) reaction center heterodimer binds P680, the primary electron donor of PSII as well as several subsequent electron acceptors. {ECO:0000255|HAMAP-Rule:MF_01379}. |
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| Catalytic activity: | |
Reaction=2 a plastoquinone + 2 H2O + 4 hnu = 2 a plastoquinol + O2; Xref=Rhea:RHEA:36359, Rhea:RHEA-COMP:9561, Rhea:RHEA-COMP:9562, ChEBI:CHEBI:15377, ChEBI:CHEBI:15379, ChEBI:CHEBI:17757, ChEBI:CHEBI:30212, ChEBI:CHEBI:62192; EC=1.10.3.9; Evidence={ECO:0000255|HAMAP-Rule:MF_01379}; |
| Cofactor: | |
Note=The D1/D2 heterodimer binds P680, chlorophylls that are the primary electron donor of PSII, and subsequent electron acceptors. It shares a non-heme iron and each subunit binds pheophytin, quinone, additional chlorophylls, carotenoids and lipids. D1 provides most of the ligands for the Mn4-Ca-O5 cluster of the oxygen-evolving complex (OEC). There is also a Cl(-1) ion associated with D1 and D2, which is required for oxygen evolution. The PSII complex binds additional chlorophylls, carotenoids and specific lipids. {ECO:0000255|HAMAP- Rule:MF_01379}; |
| Subunit: | |
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, at least 3 peripheral proteins of the oxygen- evolving complex and a large number of cofactors. It forms dimeric complexes. {ECO:0000255|HAMAP-Rule:MF_01379}. |
| Subcellular location: | |
Plastid, chloroplast thylakoid membrane {ECO:0000255|HAMAP-Rule:MF_01379}; Multi-pass membrane protein {ECO:0000255|HAMAP-Rule:MF_01379}. |
| Ptm: | |
Tyr-161 forms a radical intermediate that is referred to as redox- active TyrZ, YZ or Y-Z. {ECO:0000255|HAMAP-Rule:MF_01379}. |
| Ptm: | |
C-terminally processed by CTPA; processing is essential to allow assembly of the oxygen-evolving complex and thus photosynthetic growth. {ECO:0000255|HAMAP-Rule:MF_01379}. |
| Miscellaneous: | |
2 of the reaction center chlorophylls (ChlD1 and ChlD2) are entirely coordinated by water. {ECO:0000255|HAMAP-Rule:MF_01379}. |
| Miscellaneous: | |
Herbicides such as atrazine, BNT, diuron or ioxynil bind in the Q(B) binding site and block subsequent electron transfer. {ECO:0000255|HAMAP-Rule:MF_01379}. |
| Similarity: | |
Belongs to the reaction center PufL/M/PsbA/D family. {ECO:0000255|HAMAP-Rule:MF_01379}. |
Annotations taken from UniProtKB at the EBI.