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Database: UniProt
Entry: P0A418
LinkDB: P0A418
Original site: P0A418 
ID   PSAC_SYNPX              Reviewed;          81 AA.
AC   P0A418; O69195;
DT   15-MAR-2005, integrated into UniProtKB/Swiss-Prot.
DT   23-JAN-2007, sequence version 2.
DT   16-JAN-2019, entry version 86.
DE   RecName: Full=Photosystem I iron-sulfur center {ECO:0000255|HAMAP-Rule:MF_01303};
DE            EC=1.97.1.12 {ECO:0000255|HAMAP-Rule:MF_01303};
DE   AltName: Full=9 kDa polypeptide {ECO:0000255|HAMAP-Rule:MF_01303};
DE   AltName: Full=PSI-C {ECO:0000255|HAMAP-Rule:MF_01303};
DE   AltName: Full=Photosystem I subunit VII {ECO:0000255|HAMAP-Rule:MF_01303};
DE   AltName: Full=PsaC {ECO:0000255|HAMAP-Rule:MF_01303};
GN   Name=psaC {ECO:0000255|HAMAP-Rule:MF_01303};
GN   OrderedLocusNames=SYNW0144;
OS   Synechococcus sp. (strain WH8102).
OC   Bacteria; Cyanobacteria; Synechococcales; Synechococcaceae;
OC   Synechococcus.
OX   NCBI_TaxID=84588;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=WH8102;
RX   PubMed=12917641; DOI=10.1038/nature01943;
RA   Palenik B., Brahamsha B., Larimer F.W., Land M.L., Hauser L.,
RA   Chain P., Lamerdin J.E., Regala W., Allen E.E., McCarren J.,
RA   Paulsen I.T., Dufresne A., Partensky F., Webb E.A., Waterbury J.;
RT   "The genome of a motile marine Synechococcus.";
RL   Nature 424:1037-1042(2003).
CC   -!- FUNCTION: Apoprotein for the two 4Fe-4S centers FA and FB of
CC       photosystem I (PSI); essential for photochemical activity. FB is
CC       the terminal electron acceptor of PSI, donating electrons to
CC       ferredoxin. The C-terminus interacts with PsaA/B/D and helps
CC       assemble the protein into the PSI complex. Required for binding of
CC       PsaD and PsaE to PSI. PSI is a plastocyanin/cytochrome c6-
CC       ferredoxin oxidoreductase, converting photonic excitation into a
CC       charge separation, which transfers an electron from the donor P700
CC       chlorophyll pair to the spectroscopically characterized acceptors
CC       A0, A1, FX, FA and FB in turn. {ECO:0000255|HAMAP-Rule:MF_01303}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=hnu + oxidized [2Fe-2S]-[ferredoxin] + reduced
CC         [plastocyanin] = oxidized [plastocyanin] + reduced [2Fe-2S]-
CC         [ferredoxin]; Xref=Rhea:RHEA:30407, Rhea:RHEA-COMP:10000,
CC         Rhea:RHEA-COMP:10001, Rhea:RHEA-COMP:10039, Rhea:RHEA-
CC         COMP:10040, ChEBI:CHEBI:29036, ChEBI:CHEBI:30212,
CC         ChEBI:CHEBI:33737, ChEBI:CHEBI:33738, ChEBI:CHEBI:49552;
CC         EC=1.97.1.12; Evidence={ECO:0000255|HAMAP-Rule:MF_01303};
CC   -!- COFACTOR:
CC       Name=[4Fe-4S] cluster; Xref=ChEBI:CHEBI:49883;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01303};
CC       Note=Binds 2 [4Fe-4S] clusters. Cluster 2 is most probably the
CC       spectroscopically characterized electron acceptor FA and cluster 1
CC       is most probably FB. {ECO:0000255|HAMAP-Rule:MF_01303};
CC   -!- SUBUNIT: The cyanobacterial PSI reaction center is composed of one
CC       copy each of PsaA,B,C,D,E,F,I,J,K,L,M and X, and forms trimeric
CC       complexes. {ECO:0000255|HAMAP-Rule:MF_01303}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane
CC       {ECO:0000255|HAMAP-Rule:MF_01303}; Peripheral membrane protein
CC       {ECO:0000255|HAMAP-Rule:MF_01303}; Cytoplasmic side
CC       {ECO:0000255|HAMAP-Rule:MF_01303}.
CC   -!- SEQUENCE CAUTION:
CC       Sequence=CAE06659.1; Type=Erroneous initiation; Evidence={ECO:0000305};
DR   EMBL; BX569689; CAE06659.1; ALT_INIT; Genomic_DNA.
DR   RefSeq; WP_006850103.1; NC_005070.1.
DR   ProteinModelPortal; P0A418; -.
DR   SMR; P0A418; -.
DR   STRING; 84588.SYNW0144; -.
DR   PRIDE; P0A418; -.
DR   EnsemblBacteria; CAE06659; CAE06659; SYNW0144.
DR   KEGG; syw:SYNW0144; -.
DR   eggNOG; ENOG4108Z6M; Bacteria.
DR   eggNOG; COG1145; LUCA.
DR   HOGENOM; HOG000230505; -.
DR   KO; K02691; -.
DR   OMA; AHTVKIY; -.
DR   OrthoDB; 1873445at2; -.
DR   Proteomes; UP000001422; Chromosome.
DR   GO; GO:0009522; C:photosystem I; IEA:UniProtKB-KW.
DR   GO; GO:0042651; C:thylakoid membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0051539; F:4 iron, 4 sulfur cluster binding; IEA:UniProtKB-KW.
DR   GO; GO:0009055; F:electron transfer activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR   GO; GO:0009773; P:photosynthetic electron transport in photosystem I; IEA:InterPro.
DR   HAMAP; MF_01303; PSI_PsaC; 1.
DR   InterPro; IPR017896; 4Fe4S_Fe-S-bd.
DR   InterPro; IPR017900; 4Fe4S_Fe_S_CS.
DR   InterPro; IPR017491; PSI_PsaC.
DR   Pfam; PF12838; Fer4_7; 1.
DR   TIGRFAMs; TIGR03048; PS_I_psaC; 1.
DR   PROSITE; PS00198; 4FE4S_FER_1; 2.
DR   PROSITE; PS51379; 4FE4S_FER_2; 2.
PE   3: Inferred from homology;
KW   4Fe-4S; Complete proteome; Electron transport; Iron; Iron-sulfur;
KW   Membrane; Metal-binding; Oxidoreductase; Photosynthesis;
KW   Photosystem I; Repeat; Thylakoid; Transport.
FT   INIT_MET      1      1       Removed. {ECO:0000250}.
FT   CHAIN         2     81       Photosystem I iron-sulfur center.
FT                                /FTId=PRO_0000062023.
FT   DOMAIN        2     31       4Fe-4S ferredoxin-type 1.
FT                                {ECO:0000255|HAMAP-Rule:MF_01303}.
FT   DOMAIN       37     68       4Fe-4S ferredoxin-type 2.
FT                                {ECO:0000255|HAMAP-Rule:MF_01303}.
FT   METAL        11     11       Iron-sulfur 1 (4Fe-4S).
FT                                {ECO:0000255|HAMAP-Rule:MF_01303}.
FT   METAL        14     14       Iron-sulfur 1 (4Fe-4S).
FT                                {ECO:0000255|HAMAP-Rule:MF_01303}.
FT   METAL        17     17       Iron-sulfur 1 (4Fe-4S).
FT                                {ECO:0000255|HAMAP-Rule:MF_01303}.
FT   METAL        21     21       Iron-sulfur 2 (4Fe-4S).
FT                                {ECO:0000255|HAMAP-Rule:MF_01303}.
FT   METAL        48     48       Iron-sulfur 2 (4Fe-4S).
FT                                {ECO:0000255|HAMAP-Rule:MF_01303}.
FT   METAL        51     51       Iron-sulfur 2 (4Fe-4S).
FT                                {ECO:0000255|HAMAP-Rule:MF_01303}.
FT   METAL        54     54       Iron-sulfur 2 (4Fe-4S).
FT                                {ECO:0000255|HAMAP-Rule:MF_01303}.
FT   METAL        58     58       Iron-sulfur 1 (4Fe-4S).
FT                                {ECO:0000255|HAMAP-Rule:MF_01303}.
SQ   SEQUENCE   81 AA;  8842 MW;  49A83112370C8621 CRC64;
     MSHAVKIYDT CIGCTQCVRA CPLDVLEMVP WDGCKAGQIA SSPRTEDCVG CKRCETACPT
     DFLSIRVYLG DETTRSMGLA Y
//
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