ID   PSAK2_NOSS1             Reviewed;          92 AA.
AC   Q8YLK8;
DT   02-AUG-2002, integrated into UniProtKB/Swiss-Prot.
DT   02-AUG-2002, sequence version 2.
DT   25-MAY-2022, entry version 96.
DE   RecName: Full=Photosystem I reaction center subunit PsaK 2;
DE   AltName: Full=Photosystem I subunit X 2;
DE   Flags: Precursor;
GN   Name=psaK2; OrderedLocusNames=alr5290;
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).
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000250}; Multi-
CC       pass membrane protein {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the PsaG/PsaK family. {ECO:0000305}.
CC   -!- SEQUENCE CAUTION:
CC       Sequence=BAB76989.1; Type=Erroneous initiation; Note=Extended N-terminus.; Evidence={ECO:0000305};
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DR   EMBL; BA000019; BAB76989.1; ALT_INIT; Genomic_DNA.
DR   PIR; AB2467; AB2467.
DR   AlphaFoldDB; Q8YLK8; -.
DR   SMR; Q8YLK8; -.
DR   STRING; 103690.17134429; -.
DR   EnsemblBacteria; BAB76989; BAB76989; BAB76989.
DR   KEGG; ana:alr5290; -.
DR   eggNOG; ENOG50339HV; Bacteria.
DR   OMA; MSFGHII; -.
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-KW.
DR   Gene3D; 1.20.860.20; -; 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; Reference proteome; Thylakoid;
KW   Transmembrane; Transmembrane helix.
FT   PROPEP          1..?
FT                   /evidence="ECO:0000255"
FT                   /id="PRO_0000029398"
FT   CHAIN           ?..92
FT                   /note="Photosystem I reaction center subunit PsaK 2"
FT                   /id="PRO_0000029399"
FT   TRANSMEM        21..43
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        65..87
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
SQ   SEQUENCE   92 AA;  9615 MW;  D632C7A3FCFF7720 CRC64;
     MLSSILLAAQ ATVPNTGTTW NWNGTPIIIA SCLLVLLIAG RSIRYPHVGT KMPLPFPSIF
     NNPSVATFLA AMSFGHIIGV AAVLGLTNLG VI