HAMAP rule MF_01303

General rule information [?]

Accession	MF_01303
Dates	6-JUN-2002 (Created) 1-JUN-2023 (Last updated, Version 57)

Name

PSI_PsaC

Scope

Bacteria; Cyanobacteriota

Plastid

Templates

Q00914 (PSAC_CHLRE); P0A411 (PSAC_TRIV2); P0A415 (PSAC_THEVB); P0A416 (PSAC_SYNEL); P31087 (PSAC_SYNP2); P31085 (PSAC_SYNP6); P32422 (PSAC_SYNY3): [Recover all]

Triggered by

HAMAP; MF_01303 (Get profile general information and statistics)

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: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	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 [?]

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 [?]

GO:0009055; Molecular function: electron transfer activity.
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 [?]

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

Features [?]

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 [?]

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

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