ID   PSAK_PARMW              Reviewed;          85 AA.
AC   Q7U6P8;
DT   28-NOV-2003, integrated into UniProtKB/Swiss-Prot.
DT   01-OCT-2003, sequence version 1.
DT   03-AUG-2022, entry version 110.
DE   RecName: Full=Photosystem I reaction center subunit PsaK {ECO:0000255|HAMAP-Rule:MF_00474};
DE   AltName: Full=Photosystem I subunit X {ECO:0000255|HAMAP-Rule:MF_00474};
GN   Name=psaK {ECO:0000255|HAMAP-Rule:MF_00474}; OrderedLocusNames=SYNW1290;
OS   Parasynechococcus marenigrum (strain WH8102).
OC   Bacteria; Cyanobacteria; Synechococcales; Prochlorococcaceae;
OC   Parasynechococcus; Parasynechococcus marenigrum.
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., Chain P.,
RA   Lamerdin J.E., Regala W., Allen E.E., McCarren J., Paulsen I.T.,
RA   Dufresne A., Partensky F., Webb E.A., Waterbury J.;
RT   "The genome of a motile marine Synechococcus.";
RL   Nature 424:1037-1042(2003).
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000255|HAMAP-
CC       Rule:MF_00474}; Multi-pass membrane protein {ECO:0000255|HAMAP-
CC       Rule:MF_00474}.
CC   -!- SIMILARITY: Belongs to the PsaG/PsaK family. {ECO:0000255|HAMAP-
CC       Rule:MF_00474}.
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DR   EMBL; BX569692; CAE07805.1; -; Genomic_DNA.
DR   RefSeq; WP_011128154.1; NC_005070.1.
DR   AlphaFoldDB; Q7U6P8; -.
DR   SMR; Q7U6P8; -.
DR   STRING; 84588.SYNW1290; -.
DR   EnsemblBacteria; CAE07805; CAE07805; SYNW1290.
DR   KEGG; syw:SYNW1290; -.
DR   eggNOG; ENOG5032YIH; Bacteria.
DR   HOGENOM; CLU_160496_0_0_3; -.
DR   OMA; ANCLGHI; -.
DR   OrthoDB; 2053688at2; -.
DR   Proteomes; UP000001422; 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.
DR   PROSITE; PS01026; PHOTOSYSTEM_I_PSAGK; 1.
PE   3: Inferred from homology;
KW   Membrane; Photosynthesis; Photosystem I; Thylakoid; Transmembrane;
KW   Transmembrane helix.
FT   CHAIN           1..85
FT                   /note="Photosystem I reaction center subunit PsaK"
FT                   /id="PRO_0000206218"
FT   TRANSMEM        12..34
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00474"
FT   TRANSMEM        54..76
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00474"
SQ   SEQUENCE   85 AA;  8486 MW;  531292FBFB5A98A3 CRC64;
     MLTPLFAIAP ATVTWSPKVA LVMIVCNVIA IAVGKATIKH PSEGAKLPNA AFFGGMGHAA
     LLGTTSLGHI IGIGAIQGLA ARGVL