ID   PSAX_NOSS1              Reviewed;          44 AA.
AC   P58566;
DT   23-JAN-2002, integrated into UniProtKB/Swiss-Prot.
DT   23-JAN-2007, sequence version 2.
DT   25-MAY-2022, entry version 76.
DE   RecName: Full=Photosystem I 4.8 kDa protein;
GN   Name=psaX; OrderedLocusNames=asr1283;
OS   Nostoc sp. (strain PCC 7120 / SAG 25.82 / UTEX 2576).
OC   Bacteria; Cyanobacteria; Nostocales; Nostocaceae; Nostoc.
OX   NCBI_TaxID=103690;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=PCC 7120 / SAG 25.82 / UTEX 2576;
RX   PubMed=11759840; DOI=10.1093/dnares/8.5.205;
RA   Kaneko T., Nakamura Y., Wolk C.P., Kuritz T., Sasamoto S., Watanabe A.,
RA   Iriguchi M., Ishikawa A., Kawashima K., Kimura T., Kishida Y., Kohara M.,
RA   Matsumoto M., Matsuno A., Muraki A., Nakazaki N., Shimpo S., Sugimoto M.,
RA   Takazawa M., Yamada M., Yasuda M., Tabata S.;
RT   "Complete genomic sequence of the filamentous nitrogen-fixing
RT   cyanobacterium Anabaena sp. strain PCC 7120.";
RL   DNA Res. 8:205-213(2001).
RN   [2]
RP   PROTEIN SEQUENCE OF 2-11, SUBUNIT, AND SUBCELLULAR LOCATION.
RC   STRAIN=PCC 7120 / SAG 25.82 / UTEX 2576;
RX   PubMed=24550276; DOI=10.1073/pnas.1320599111;
RA   Watanabe M., Semchonok D.A., Webber-Birungi M.T., Ehira S., Kondo K.,
RA   Narikawa R., Ohmori M., Boekema E.J., Ikeuchi M.;
RT   "Attachment of phycobilisomes in an antenna-photosystem I supercomplex of
RT   cyanobacteria.";
RL   Proc. Natl. Acad. Sci. U.S.A. 111:2512-2517(2014).
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 dimeric and
CC       tetrameric complexes. {ECO:0000269|PubMed:24550276}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane
CC       {ECO:0000269|PubMed:24550276}; Single-pass membrane protein
CC       {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the PsaX family. {ECO:0000305}.
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DR   EMBL; BA000019; BAB73240.1; -; Genomic_DNA.
DR   PIR; AH1966; AH1966.
DR   RefSeq; WP_010995455.1; NZ_RSCN01000021.1.
DR   PDB; 6JEO; EM; 3.30 A; aX/bX/cX/dX=1-44.
DR   PDB; 6K61; EM; 2.37 A; X/x=1-44.
DR   PDB; 6TCL; EM; 3.20 A; X/X1/X2/XX=5-43.
DR   PDBsum; 6JEO; -.
DR   PDBsum; 6K61; -.
DR   PDBsum; 6TCL; -.
DR   AlphaFoldDB; P58566; -.
DR   SMR; P58566; -.
DR   STRING; 103690.17130630; -.
DR   EnsemblBacteria; BAB73240; BAB73240; BAB73240.
DR   KEGG; ana:asr1283; -.
DR   eggNOG; ENOG5033C9V; Bacteria.
DR   Proteomes; UP000002483; Chromosome.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
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:0015979; P:photosynthesis; IEA:UniProtKB-KW.
DR   InterPro; IPR012986; PSI_PsaX.
DR   InterPro; IPR036243; PSI_PsaX_sf.
DR   Pfam; PF08078; PsaX; 1.
DR   SUPFAM; SSF81552; SSF81552; 1.
PE   1: Evidence at protein level;
KW   3D-structure; Direct protein sequencing; Membrane; Photosynthesis;
KW   Photosystem I; Reference proteome; Thylakoid; Transmembrane;
KW   Transmembrane helix.
FT   INIT_MET        1
FT                   /note="Removed"
FT                   /evidence="ECO:0000269|PubMed:24550276"
FT   CHAIN           2..44
FT                   /note="Photosystem I 4.8 kDa protein"
FT                   /id="PRO_0000207774"
FT   TRANSMEM        23..43
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   HELIX           19..39
FT                   /evidence="ECO:0007829|PDB:6K61"
SQ   SEQUENCE   44 AA;  4868 MW;  086732A1A89936EC CRC64;
     MAKAKISPVA NTGAKPPYTF RTGWALLLLA VNFLVAAYYF HIIQ