HAMAP rule MF_01303
General rule information
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| Accession | MF_01303 |
| Dates | 6-JUN-2002 (Created)
2-SEP-2024 (Last updated, Version 58) |
| Name | PSI_PsaC |
| Scope(s) |
Bacteria Cyanobacteriota Plastid |
| Template(s) | Q00914 (PSAC_CHLRE); P0A411 (PSAC_TRIV2); P0A415 (PSAC_THEVB); P0A416 (PSAC_SYNEL); P31087 (PSAC_PICP2); P31085 (PSAC_SYNP6); P32422 (PSAC_SYNY3); [ Recover all ] |
| Triggered by |
HAMAP; MF_01303 (Get profile general information and statistics) |
Propagated annotation
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Identifier, protein and gene names
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| 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 | Name=psaC; |
Comments
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| case <OC:Cyanobacteriota> 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 | Reaction=reduced [plastocyanin] + hnu + oxidized [2Fe-2S]-[ferredoxin] = oxidized [plastocyanin] + reduced [2Fe-2S]-[ferredoxin]; Xref=Rhea:RHEA:30407, Rhea:RHEA-COMP:10000, Rhea:RHEA-COMP:10001, Rhea:RHEA-COMP:10039, Rhea:RHEA-COMP:10040, ChEBI:CHEBI:29036, ChEBI:CHEBI:30212, ChEBI:CHEBI:33737, ChEBI:CHEBI:33738, ChEBI:CHEBI:49552; EC=1.97.1.12; |
| COFACTOR | Name=[4Fe-4S] cluster; Xref=ChEBI:CHEBI:49883; 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
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| 4Fe-4S | |
| Electron transport | |
| Iron | |
| Iron-sulfur | |
| Membrane | |
| Metal-binding | |
| Photosynthesis | |
| Photosystem I | |
| Repeat | |
| Transport | |
| Oxidoreductase | |
| case <OC:Gloeobacter> | |
| Cell membrane | |
| Cell inner membrane | |
| else | |
| Thylakoid | |
| end case | |
Gene Ontology
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| GO:0009055; Molecular function:electron transfer activity | |
| GO:0015979; Biological process:photosynthesis | |
| case <OG:Chloroplast> | |
| GO:0009535; Cellular component:chloroplast thylakoid membrane | |
| else case <OCellular component:Gloeobacter> | |
| GO:0005886; Cellular component:plasma membrane | |
| else; https://www.ebi.ac.uk/QuickGO/term/else | |
| GO:0042651; Cellular component:thylakoid membrane | |
| end case | |
Cross-references
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| Pfam | PF00037; Fer4; 2; |
| PRINTS | PR00353; 4FE4SFRDOXIN; 2; |
| PROSITE | PS00198; 4FE4S_FER_1; 2; |
| PROSITE | PS51379; 4FE4S_FER_2; 2; |
| NCBIfam | TIGR03048; PS_I_psaC; 1; |
Features
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| From: PSAC_THEVB (P0A415) | ||||||||||||
| Key | From | To | Description | Tag | Condition | FTGroup | ||||||
| BINDING | 11 | 11 | /ligand="[4Fe-4S] cluster" /ligand_id="ChEBI:CHEBI:49883" /ligand_label="1" |
C | ||||||||
| BINDING | 14 | 14 | /ligand="[4Fe-4S] cluster" /ligand_id="ChEBI:CHEBI:49883" /ligand_label="1" |
C | ||||||||
| BINDING | 17 | 17 | /ligand="[4Fe-4S] cluster" /ligand_id="ChEBI:CHEBI:49883" /ligand_label="1" |
C | ||||||||
| BINDING | 21 | 21 | /ligand="[4Fe-4S] cluster" /ligand_id="ChEBI:CHEBI:49883" /ligand_label="2" |
C | ||||||||
| BINDING | 48 | 48 | /ligand="[4Fe-4S] cluster" /ligand_id="ChEBI:CHEBI:49883" /ligand_label="2" |
C | ||||||||
| BINDING | 51 | 51 | /ligand="[4Fe-4S] cluster" /ligand_id="ChEBI:CHEBI:49883" /ligand_label="2" |
C | ||||||||
| BINDING | 54 | 54 | /ligand="[4Fe-4S] cluster" /ligand_id="ChEBI:CHEBI:49883" /ligand_label="2" |
C | ||||||||
| BINDING | 58 | 58 | /ligand="[4Fe-4S] cluster" /ligand_id="ChEBI:CHEBI:49883" /ligand_label="1" |
C | ||||||||
Additional information
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| Size range | 81-93 amino acids |
| Related rules |
None |
| Fusion | Nter: None Cter: None |