ID   PSAK_GALSU              Reviewed;          69 AA.
AC   P31567;
DT   01-JUL-1993, integrated into UniProtKB/Swiss-Prot.
DT   01-JUL-1993, sequence version 1.
DT   25-MAY-2022, entry version 89.
DE   RecName: Full=Photosystem I reaction center subunit PsaK;
DE   AltName: Full=PSI-K;
DE   AltName: Full=Photosystem I subunit X;
GN   Name=psaK;
OS   Galdieria sulphuraria (Red alga).
OG   Plastid; Chloroplast.
OC   Eukaryota; Rhodophyta; Bangiophyceae; Cyanidiales; Cyanidiaceae; Galdieria.
OX   NCBI_TaxID=130081;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   STRAIN=14-1-1 / Isolate 107.79/Goettingen;
RX   PubMed=1391770; DOI=10.1007/bf00014494;
RA   Valentin K.-U., Maid U., Emich A., Zetsche K.;
RT   "Organization and expression of a phycobiliprotein gene cluster from the
RT   unicellular red alga Cyanidium caldarium.";
RL   Plant Mol. Biol. 20:267-276(1992).
CC   -!- SUBCELLULAR LOCATION: Plastid, chloroplast thylakoid membrane
CC       {ECO:0000250}; Multi-pass membrane protein {ECO:0000250}.
CC   -!- MISCELLANEOUS: Although originally identified as Cyanidium caldarium,
CC       these sequences derive from Galdieria sulphuraria. {ECO:0000305}.
CC   -!- SIMILARITY: Belongs to the PsaG/PsaK family. {ECO:0000305}.
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DR   EMBL; X57150; CAA40440.1; -; Genomic_DNA.
DR   AlphaFoldDB; P31567; -.
DR   SMR; P31567; -.
DR   GO; GO:0009535; C:chloroplast thylakoid membrane; IEA:UniProtKB-SubCell.
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: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   PROSITE; PS01026; PHOTOSYSTEM_I_PSAGK; 1.
PE   3: Inferred from homology;
KW   Chloroplast; Membrane; Photosynthesis; Photosystem I; Plastid; Thylakoid;
KW   Transmembrane; Transmembrane helix.
FT   CHAIN           1..69
FT                   /note="Photosystem I reaction center subunit PsaK"
FT                   /id="PRO_0000206213"
FT   TRANSMEM        1..21
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        42..62
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
SQ   SEQUENCE   69 AA;  7405 MW;  BF9799E3A7060028 CRC64;
     MLIAVSTNII FIVVNTICVI LGKYSVQNKK NESYSIANIN LAELLASMSL GHIISSATVL
     GLKSLNLIQ