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Annotation rule MF_01303
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General rule information [?]

Accession MF_01303
Dates 6-JUN-2002 (Created)
19-NOV-2019 (Last updated, Version 50)
Name PSI_PsaC
Scope
Bacteria; Cyanobacteria
Plastid
Templates Q00914 (PSAC_CHLRE); P0A411 (PSAC_TRIV2); P0A415 (PSAC_THEEB); P0A416 (PSAC_SYNEL); P31087 (PSAC_SYNP2); P31085 (PSAC_SYNP6); P32422 (PSAC_SYNY3): [Recover all]

Propagated annotation [?]


Identifier, protein and gene names [?]

Identifier
PSAC
Protein name
RecName: Full=Photosystem I iron-sulfur center;
EC 1.97.1.12;
AltName: Full=9 kDa polypeptide;
AltName: Full=PSI-C;
AltName: Full=Photosystem I subunit VII;
AltName: Full=PsaC;
Gene name
psaC

Comments [?]

case <OC:Cyanobacteria> or <OG:Chloroplast> and not <OC:Streptophyta>
Function Apoprotein for the two 4Fe-4S centers FA and FB of photosystem I (PSI); essential for photochemical activity. FB is the terminal electron acceptor of PSI, donating electrons to ferredoxin. The C-terminus interacts with PsaA/B/D and helps assemble the protein into the PSI complex. Required for binding of PsaD and PsaE to PSI. PSI is a plastocyanin/cytochrome c6-ferredoxin oxidoreductase, converting photonic excitation into a charge separation, which transfers an electron from the donor P700 chlorophyll pair to the spectroscopically characterized acceptors A0, A1, FX, FA and FB in turn.
end case
case <OG:Chloroplast> and <OC:Streptophyta>
Function Apoprotein for the two 4Fe-4S centers FA and FB of photosystem I (PSI); essential for photochemical activity. FB is the terminal electron acceptor of PSI, donating electrons to ferredoxin. The C-terminus interacts with PsaA/B/D and helps assemble the protein into the PSI complex. Required for binding of PsaD and PsaE to PSI. PSI is a plastocyanin-ferredoxin oxidoreductase, converting photonic excitation into a charge separation, which transfers an electron from the donor P700 chlorophyll pair to the spectroscopically characterized acceptors A0, A1, FX, FA and FB in turn.
end case
Catalytic activity RHEA:30407: hnu + oxidized [2Fe-2S]-[ferredoxin] + reduced [plastocyanin] = oxidized [plastocyanin] + reduced [2Fe-2S]-[ferredoxin]
EC 1.97.1.12
Cofactor [4Fe-4S] cluster
Note: Binds 2 [4Fe-4S] clusters. Cluster 2 is most probably the spectroscopically characterized electron acceptor FA and cluster 1 is most probably FB.
case <OG:Chloroplast>
Subunit The eukaryotic PSI reaction center is composed of at least 11 subunits.
Subcellular location Plastid, chloroplast thylakoid membrane; Peripheral membrane protein; Stromal side.
else case <OC:Gloeobacter>
Subunit The cyanobacterial PSI reaction center is composed of one copy each of PsaA,B,C,D,E,F,I,J,K,L,M and X, and forms trimeric complexes.
Subcellular location Cell inner membrane; Peripheral membrane protein; Cytoplasmic side.
else
Subunit The cyanobacterial PSI reaction center is composed of one copy each of PsaA,B,C,D,E,F,I,J,K,L,M and X, and forms trimeric complexes.
Subcellular location Cellular thylakoid membrane; Peripheral membrane protein; Cytoplasmic side.
end case

Keywords [?]

case <OC:Gloeobacter>
else
end case

Gene Ontology [?]

GO:0009055; Molecular function: electron transfer activity.
GO:0015979; Biological process: photosynthesis.
GO:0055114; Biological process: oxidation-reduction process.
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 [?]

Pfam PF00037; Fer4; 2;
PRINTS PR00353; 4FE4SFRDOXIN; 2;
PROSITE PS00198; 4FE4S_FER_1; 2;
PS51379; 4FE4S_FER_2; 2; trigger=PRU00711;
TIGRFAMs TIGR03048; PS_I_psaC; 1;

Features [?]

From: PSAC_THEEB (P0A415)
Key     From     To       Description   Tag   Condition   FTGroup
METAL     11     11       Iron-sulfur 1 (4Fe-4S)     C  
METAL     14     14       Iron-sulfur 1 (4Fe-4S)     C  
METAL     17     17       Iron-sulfur 1 (4Fe-4S)     C  
METAL     21     21       Iron-sulfur 2 (4Fe-4S)     C  
METAL     48     48       Iron-sulfur 2 (4Fe-4S)     C  
METAL     51     51       Iron-sulfur 2 (4Fe-4S)     C  
METAL     54     54       Iron-sulfur 2 (4Fe-4S)     C  
METAL     58     58       Iron-sulfur 1 (4Fe-4S)     C  

Additional information [?]

Size range 81-93 amino acids
Related rules None
Fusion None