ID   PSAK1_NOSS1             Reviewed;          86 AA.
AC   P58583;
DT   23-JAN-2002, integrated into UniProtKB/Swiss-Prot.
DT   23-JAN-2002, sequence version 1.
DT   25-MAY-2022, entry version 109.
DE   RecName: Full=Photosystem I reaction center subunit PsaK 1;
DE   AltName: Full=Photosystem I subunit X 1;
DE   Flags: Precursor;
GN   Name=psaK1; OrderedLocusNames=asr4775;
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 9-17, 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}; Multi-pass membrane protein
CC       {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the PsaG/PsaK family. {ECO:0000305}.
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DR   EMBL; BA000019; BAB76474.1; -; Genomic_DNA.
DR   PIR; AG2402; AG2402.
DR   RefSeq; WP_010998905.1; NZ_RSCN01000035.1.
DR   PDB; 6JEO; EM; 3.30 A; aK/bK/cK/dK=1-86.
DR   PDB; 6K61; EM; 2.37 A; K/k=1-86.
DR   PDBsum; 6JEO; -.
DR   PDBsum; 6K61; -.
DR   AlphaFoldDB; P58583; -.
DR   SMR; P58583; -.
DR   STRING; 103690.17133912; -.
DR   EnsemblBacteria; BAB76474; BAB76474; BAB76474.
DR   KEGG; ana:asr4775; -.
DR   eggNOG; ENOG5032YIH; Bacteria.
DR   OMA; ANCLGHI; -.
DR   OrthoDB; 2053688at2; -.
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-UniRule.
DR   Gene3D; 1.20.860.20; -; 1.
DR   HAMAP; MF_00474; PSI_PsaK; 1.
DR   InterPro; IPR035982; PSI_centre_PsaK_sf.
DR   InterPro; IPR000549; PSI_PsaG/PsaK.
DR   InterPro; IPR017492; PSI_PsaK.
DR   InterPro; IPR037101; PSI_PsaK_bact.
DR   Pfam; PF01241; PSI_PSAK; 1.
DR   SUPFAM; SSF81563; SSF81563; 1.
DR   TIGRFAMs; TIGR03049; PS_I_psaK; 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   PROPEP          1..8
FT                   /evidence="ECO:0000250"
FT                   /id="PRO_0000029396"
FT   CHAIN           9..86
FT                   /note="Photosystem I reaction center subunit PsaK 1"
FT                   /id="PRO_0000029397"
FT   TRANSMEM        14..34
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        60..80
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   HELIX           18..38
FT                   /evidence="ECO:0007829|PDB:6K61"
FT   STRAND          45..47
FT                   /evidence="ECO:0007829|PDB:6K61"
FT   STRAND          51..56
FT                   /evidence="ECO:0007829|PDB:6K61"
FT   HELIX           59..83
FT                   /evidence="ECO:0007829|PDB:6K61"
SQ   SEQUENCE   86 AA;  8847 MW;  F8DC13BAEE59770A CRC64;
     MLTSTLLAAA TTPLEWSPTV GIIMVIANVI AITFGRQTIK YPSAEPALPS AKFFGGFGAP
     ALLATTAFGH ILGVGLVLGL HNLGRI