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PSAC_PROM3
ID   PSAC_PROM3              Reviewed;          81 AA.
AC   A2CCX5;
DT   26-JUN-2007, integrated into UniProtKB/Swiss-Prot.
DT   20-FEB-2007, sequence version 1.
DT   03-AUG-2022, entry version 88.
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}; OrderedLocusNames=P9303_26051;
OS   Prochlorococcus marinus (strain MIT 9303).
OC   Bacteria; Cyanobacteria; Synechococcales; Prochlorococcaceae;
OC   Prochlorococcus.
OX   NCBI_TaxID=59922;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=MIT 9303;
RX   PubMed=18159947; DOI=10.1371/journal.pgen.0030231;
RA   Kettler G.C., Martiny A.C., Huang K., Zucker J., Coleman M.L., Rodrigue S.,
RA   Chen F., Lapidus A., Ferriera S., Johnson J., Steglich C., Church G.M.,
RA   Richardson P., Chisholm S.W.;
RT   "Patterns and implications of gene gain and loss in the evolution of
RT   Prochlorococcus.";
RL   PLoS Genet. 3:2515-2528(2007).
CC   -!- FUNCTION: Apoprotein for the two 4Fe-4S centers FA and FB of
CC       photosystem I (PSI); essential for photochemical activity. FB is the
CC       terminal electron acceptor of PSI, donating electrons to ferredoxin.
CC       The C-terminus interacts with PsaA/B/D and helps assemble the protein
CC       into the PSI complex. Required for binding of PsaD and PsaE to PSI. PSI
CC       is a plastocyanin/cytochrome c6-ferredoxin oxidoreductase, converting
CC       photonic excitation into a charge separation, which transfers an
CC       electron from the donor P700 chlorophyll pair to the spectroscopically
CC       characterized acceptors A0, A1, FX, FA and FB in turn.
CC       {ECO:0000255|HAMAP-Rule:MF_01303}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=hnu + oxidized [2Fe-2S]-[ferredoxin] + reduced [plastocyanin]
CC         = oxidized [plastocyanin] + reduced [2Fe-2S]-[ferredoxin];
CC         Xref=Rhea:RHEA:30407, Rhea:RHEA-COMP:10000, Rhea:RHEA-COMP:10001,
CC         Rhea:RHEA-COMP:10039, Rhea:RHEA-COMP:10040, ChEBI:CHEBI:29036,
CC         ChEBI:CHEBI:30212, ChEBI:CHEBI:33737, ChEBI:CHEBI:33738,
CC         ChEBI:CHEBI:49552; EC=1.97.1.12; Evidence={ECO:0000255|HAMAP-
CC         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 is
CC       most probably FB. {ECO:0000255|HAMAP-Rule:MF_01303};
CC   -!- SUBUNIT: The cyanobacterial PSI reaction center is composed of one copy
CC       each of PsaA,B,C,D,E,F,I,J,K,L,M and X, and forms trimeric complexes.
CC       {ECO:0000255|HAMAP-Rule:MF_01303}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000255|HAMAP-
CC       Rule:MF_01303}; Peripheral membrane protein {ECO:0000255|HAMAP-
CC       Rule:MF_01303}; Cytoplasmic side {ECO:0000255|HAMAP-Rule:MF_01303}.
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DR   EMBL; CP000554; ABM79335.1; -; Genomic_DNA.
DR   AlphaFoldDB; A2CCX5; -.
DR   SMR; A2CCX5; -.
DR   STRING; 59922.P9303_26051; -.
DR   EnsemblBacteria; ABM79335; ABM79335; P9303_26051.
DR   KEGG; pmf:P9303_26051; -.
DR   HOGENOM; CLU_139698_8_0_3; -.
DR   OMA; GHMSHAV; -.
DR   BioCyc; PMAR59922:G1G80-2281-MON; -.
DR   Proteomes; UP000002274; Chromosome.
DR   GO; GO:0009522; C:photosystem I; IEA:UniProtKB-KW.
DR   GO; GO:0031676; C:plasma membrane-derived 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; Electron transport; Iron; Iron-sulfur; Membrane; Metal-binding;
KW   Oxidoreductase; Photosynthesis; Photosystem I; Repeat; Thylakoid;
KW   Transport.
FT   INIT_MET        1
FT                   /note="Removed"
FT                   /evidence="ECO:0000250"
FT   CHAIN           2..81
FT                   /note="Photosystem I iron-sulfur center"
FT                   /id="PRO_0000292099"
FT   DOMAIN          2..31
FT                   /note="4Fe-4S ferredoxin-type 1"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01303"
FT   DOMAIN          39..68
FT                   /note="4Fe-4S ferredoxin-type 2"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01303"
FT   BINDING         11
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /ligand_label="1"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01303"
FT   BINDING         14
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /ligand_label="1"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01303"
FT   BINDING         17
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /ligand_label="1"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01303"
FT   BINDING         21
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /ligand_label="2"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01303"
FT   BINDING         48
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /ligand_label="2"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01303"
FT   BINDING         51
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /ligand_label="2"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01303"
FT   BINDING         54
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /ligand_label="2"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01303"
FT   BINDING         58
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /ligand_label="1"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01303"
SQ   SEQUENCE   81 AA;  8876 MW;  5C483D78371B30F3 CRC64;
     MSHAVKIYDT CIGCTQCVRA CPLDVLEMVP WDGHKSGQIA ASPRTEDCVG CKRCETACPT
     DFLSIRVYLG DETTRSMGLA Y
 
 
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