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Annotation rule MF_01383
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General rule information [?]

Accession MF_01383
Dates 2-DEC-2008 (Created)
19-NOV-2019 (Last updated, Version 20)
Name PSII_PsbD_D2
Scope
Bacteria; Cyanobacteria
Plastid
Templates D0VWR8 (PSBD_THEVL); Q8CM25 (PSBD_THEEB); P56761 (PSBD_ARATH); P06005 (PSBD_SPIOL): [Recover all]

Propagated annotation [?]


Identifier, protein and gene names [?]

Identifier
PSBD
Protein name
RecName: Full=Photosystem II D2 protein;
Short=PSII D2 protein;
EC 1.10.3.9;
AltName: Full=Photosystem Q(A) protein;
Gene name
psbD

Comments [?]

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.
Catalytic activity RHEA:36359: 2 a plastoquinone + 2 H2O + 4 hnu = 2 a plastoquinol + O2
EC 1.10.3.9
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.
case <OC:Cyanobacteria>
Subunit 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, at least 3 peripheral proteins PsbO, PsbU, PsbV and a large number of cofactors. It forms dimeric complexes.
else
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.
end case
case <OG:Chloroplast>
Subcellular location Plastid, chloroplast thylakoid membrane; Multi-pass membrane protein.
else case <OC:Gloeobacter>
Subcellular location Cell inner membrane; Multi-pass membrane protein.
else
Subcellular location Cellular thylakoid membrane; Multi-pass membrane protein.
end case
Miscellaneous 2 of the reaction center chlorophylls (ChlD1 and ChlD2) are entirely coordinated by water.
Similarity Belongs to the reaction center PufL/M/PsbA/D family.

Keywords [?]

case <OC:Gloeobacter>
else
end case

Gene Ontology [?]

GO:0016168; Molecular function: chlorophyll binding.
GO:0009055; Molecular function: electron transfer activity.
GO:0005506; Molecular function: iron ion binding.
GO:0015979; Biological process: photosynthesis.
case <OG:Chloroplast>
GO:0009535; Cellular component: chloroplast thylakoid membrane.
else case <OC:Gloeobacter>
GO:0005886; Cellular component: plasma membrane.
else
GO:0042651; Cellular component: thylakoid membrane.
end case

Cross-references [?]

PROSITE PS00244; REACTION_CENTER; 1;
Pfam PF00124; Photo_RC; 1;
PRINTS PR00256; REACTNCENTRE; 1;
TIGRFAMs TIGR01152; PsbD; 1;

Features [?]

From: PSBD_THEVL (D0VWR8)
Key     From     To       Description   Tag   Condition   FTGroup
TRANSMEM     30     50       Helical        
TRANSMEM     114     130       Helical        
TRANSMEM     142     155       Helical        
TRANSMEM     197     217       Helical        
TRANSMEM     268     284       Helical        
METAL     107     107       Magnesium (chlorophyll-a ChlzD2, axial ligand; peripheral); via tele nitrogen     H  
METAL     187     187       Magnesium (chlorophyll-a PD2 axial ligand); via tele nitrogen     H  
METAL     204     204       Iron; shared with heterodimeric partner; via tele nitrogen     H  
METAL     258     258       Iron; shared with heterodimeric partner; via tele nitrogen     H  
BINDING     119     119       Pheophytin D2     Q  
BINDING     132     132       Pheophytin D2     N  
BINDING     204     204       Plastoquinone Q(A)     H  
BINDING     251     251       Plastoquinone Q(A); via amide nitrogen     F  

Additional information [?]

Size range 350-365 amino acids
Related rules None
Fusion None
Comments D2 is phosphorylated in "higer" and "lower eukaryotes" (Ceratodon purpureus, Marchantia polymorpha, Adiantum tenerum, in the last 3 the site was not identified) but not in red algae or cyanobacteria (Ceramium tenuicorne and Synechocystis, see PubMed:9512353). Cyanobacteria often have more than 1 (often identical) gene for this protein.