UniProt functional annotation for P06005



	UniProt functional annotation for P06005

UniProt code: P06005.

Organism: Spinacia oleracea (Spinach).

Taxonomy: Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta; Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae; Caryophyllales; Chenopodiaceae; Chenopodioideae; Anserineae; Spinacia.

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. D2 is needed for assembly of a stable PSII complex. {ECO:0000255|HAMAP-Rule:MF_01383}.

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_01383};

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. 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_01383};

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_01383}.

Subcellular location: Plastid, chloroplast thylakoid membrane {ECO:0000255|HAMAP-Rule:MF_01383, ECO:0000269|PubMed:3121625}; Multi- pass membrane protein {ECO:0000255|HAMAP-Rule:MF_01383}.

Mass spectrometry: Mass=39418.8; Mass_error=3.9; Method=Electrospray; Note=Non-phosphorylated.; Evidence={ECO:0000269|PubMed:9655347};

Miscellaneous: 2 of the reaction center chlorophylls (ChlD1 and ChlD2) are entirely coordinated by water. {ECO:0000255|HAMAP-Rule:MF_01383}.

Similarity: Belongs to the reaction center PufL/M/PsbA/D family. {ECO:0000255|HAMAP-Rule:MF_01383}.

Annotations taken from UniProtKB at the EBI.


Organism:		Spinacia oleracea (Spinach).
Taxonomy:		Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta; Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae; Caryophyllales; Chenopodiaceae; Chenopodioideae; Anserineae; Spinacia.



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. D2 is needed for assembly of a stable PSII complex. {ECO:0000255\|HAMAP-Rule:MF_01383}.


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_01383};
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. 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_01383};
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_01383}.
Subcellular location:		Plastid, chloroplast thylakoid membrane {ECO:0000255\|HAMAP-Rule:MF_01383, ECO:0000269\|PubMed:3121625}; Multi- pass membrane protein {ECO:0000255\|HAMAP-Rule:MF_01383}.
Mass spectrometry:		Mass=39418.8; Mass_error=3.9; Method=Electrospray; Note=Non-phosphorylated.; Evidence={ECO:0000269\|PubMed:9655347};
Miscellaneous:		2 of the reaction center chlorophylls (ChlD1 and ChlD2) are entirely coordinated by water. {ECO:0000255\|HAMAP-Rule:MF_01383}.
Similarity:		Belongs to the reaction center PufL/M/PsbA/D family. {ECO:0000255\|HAMAP-Rule:MF_01383}.