ID   PSAK_TRIV2              Reviewed;          86 AA.
AC   P23317; Q3MAC6;
DT   01-NOV-1991, integrated into UniProtKB/Swiss-Prot.
DT   04-APR-2006, sequence version 2.
DT   25-MAY-2022, entry version 131.
DE   RecName: Full=Photosystem I reaction center subunit PsaK;
DE   AltName: Full=Light-harvesting 6.8 kDa polypeptide;
DE   AltName: Full=Photosystem I subunit X;
DE   Flags: Precursor;
GN   Name=psaK; OrderedLocusNames=Ava_2445;
OS   Trichormus variabilis (strain ATCC 29413 / PCC 7937) (Anabaena variabilis).
OC   Bacteria; Cyanobacteria; Nostocales; Nostocaceae; Trichormus.
OX   NCBI_TaxID=240292;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 29413 / PCC 7937;
RX   PubMed=25197444; DOI=10.4056/sigs.3899418;
RA   Thiel T., Pratte B.S., Zhong J., Goodwin L., Copeland A., Lucas S., Han C.,
RA   Pitluck S., Land M.L., Kyrpides N.C., Woyke T.;
RT   "Complete genome sequence of Anabaena variabilis ATCC 29413.";
RL   Stand. Genomic Sci. 9:562-573(2014).
RN   [2]
RP   PROTEIN SEQUENCE OF 9-39.
RX   PubMed=1908790; DOI=10.1016/0014-5793(91)80003-l;
RA   Ikeuchi M., Nyhus K.J., Inoue Y., Pakrasi H.B.;
RT   "Identities of four low-molecular-mass subunits of the photosystem I
RT   complex from Anabaena variabilis ATCC 29413. Evidence for the presence of
RT   the psaI gene product in a cyanobacterial complex.";
RL   FEBS Lett. 287:5-9(1991).
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   EMBL; CP000117; ABA22060.1; -; Genomic_DNA.
DR   PIR; S16979; S16979.
DR   AlphaFoldDB; P23317; -.
DR   SMR; P23317; -.
DR   STRING; 240292.Ava_2445; -.
DR   EnsemblBacteria; ABA22060; ABA22060; Ava_2445.
DR   KEGG; ava:Ava_2445; -.
DR   eggNOG; ENOG5032YIH; Bacteria.
DR   HOGENOM; CLU_160496_1_0_3; -.
DR   OMA; ANCLGHI; -.
DR   Proteomes; UP000002533; 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   Direct protein sequencing; Membrane; Photosynthesis; Photosystem I;
KW   Thylakoid; Transmembrane; Transmembrane helix.
FT   PROPEP          1..8
FT                   /evidence="ECO:0000269|PubMed:1908790"
FT                   /id="PRO_0000232409"
FT   CHAIN           9..86
FT                   /note="Photosystem I reaction center subunit PsaK"
FT                   /id="PRO_0000206217"
FT   TRANSMEM        14..34
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        60..80
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
SQ   SEQUENCE   86 AA;  8909 MW;  F154A6697E4BF59A CRC64;
     MLTSTLLAAA TTPLEWSPTI GIIMVIANVI AITFGRQTIK YPSAEPALPS AKFFGGFGAP
     ALLATTAFGH ILGVGIILGL HNLGRF