ID   PSAK_THEVL              Reviewed;          85 AA.
AC   P23318;
DT   01-NOV-1991, integrated into UniProtKB/Swiss-Prot.
DT   01-OCT-1994, sequence version 2.
DT   25-MAY-2022, entry version 97.
DE   RecName: Full=Photosystem I reaction center subunit PsaK;
DE   AltName: Full=Light-harvesting 6.5 kDa polypeptide;
DE   AltName: Full=Photosystem I subunit X;
DE   Flags: Precursor;
GN   Name=psaK;
OS   Thermostichus vulcanus (Synechococcus vulcanus).
OC   Bacteria; Cyanobacteria; Thermostichales; Thermostichaceae; Thermostichus.
OX   NCBI_TaxID=32053;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RA   Bryant D.A.;
RT   "The photosystems: structure, function, and molecular biology.";
RL   (In) Barber J. (eds.);
RL   Current topics in photosynthesis, pp.11:501-549, Elsevier, Amsterdam
RL   (1992).
RN   [2]
RP   PROTEIN SEQUENCE OF 6-35.
RX   PubMed=2503399; DOI=10.1016/0014-5793(89)80971-8;
RA   Koike H., Ikeuchi M., Hiyama T., Inoue Y.;
RT   "Identification of photosystem I components from the cyanobacterium,
RT   Synechococcus vulcanus by N-terminal sequencing.";
RL   FEBS Lett. 253:257-263(1989).
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000305}; Multi-
CC       pass membrane protein {ECO:0000305}.
CC   -!- SIMILARITY: Belongs to the PsaG/PsaK family. {ECO:0000305}.
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DR   PIR; S05223; S05223.
DR   PDB; 6K33; EM; 2.74 A; aK/bK/cK=1-85.
DR   PDBsum; 6K33; -.
DR   AlphaFoldDB; P23318; -.
DR   SMR; P23318; -.
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   1: Evidence at protein level;
KW   3D-structure; Direct protein sequencing; Membrane; Photosynthesis;
KW   Photosystem I; Thylakoid; Transmembrane; Transmembrane helix.
FT   PROPEP          1..5
FT                   /evidence="ECO:0000269|PubMed:2503399"
FT                   /id="PRO_0000029406"
FT   CHAIN           6..85
FT                   /note="Photosystem I reaction center subunit PsaK"
FT                   /id="PRO_0000029407"
FT   TRANSMEM        13..31
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        69..85
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
SQ   SEQUENCE   85 AA;  8664 MW;  DDE25564ED185323 CRC64;
     MVLATTLPDT TWTPSVGLVV ILSNLFAIAL GRYAIQSRGK GPGLPIALPA LFEGFGLPEL
     LATTSFGHLL AAGVVSVGLQ YAGAL