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Annotation rule MF_01383 |
General rule information
[?]
Accession |
MF_01383 |
Dates |
2-DEC-2008 (Created) 19-NOV-2019 (Last updated, Version 20) |
Scope |
Bacteria; Cyanobacteria
Plastid |
Propagated annotation
[?]
Identifier, protein and gene names
[?]
Protein name |
RecName:
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Full=Photosystem II D2 protein;
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Short=PSII D2 protein;
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EC 1.10.3.9;
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AltName:
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Full=Photosystem Q(A) protein;
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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. 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. |
case <OC:Gloeobacter>
else
end case
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>
else
GO:0042651; Cellular component: thylakoid membrane.
end case
From: PSBD_THEVL (D0VWR8) |
Key
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From
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To
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Description
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Tag
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Condition
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FTGroup
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TRANSMEM
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30
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50
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Helical
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TRANSMEM
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114
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130
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Helical
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TRANSMEM
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142
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155
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Helical
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|
|
|
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TRANSMEM
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197
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217
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Helical
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TRANSMEM
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268
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284
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Helical
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METAL
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107
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107
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Magnesium (chlorophyll-a ChlzD2, axial ligand; peripheral); via tele nitrogen
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H
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METAL
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187
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187
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Magnesium (chlorophyll-a PD2 axial ligand); via tele nitrogen
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H
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METAL
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204
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204
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Iron; shared with heterodimeric partner; via tele nitrogen
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H
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METAL
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258
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258
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Iron; shared with heterodimeric partner; via tele nitrogen
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H
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BINDING
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119
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119
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Pheophytin D2
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Q
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BINDING
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132
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132
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Pheophytin D2
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N
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BINDING
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204
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204
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Plastoquinone Q(A)
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H
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BINDING
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251
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251
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Plastoquinone Q(A); via amide nitrogen
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F
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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. |