ID   PSAK_MASLA              Reviewed;          86 AA.
AC   Q9S3W9;
DT   02-NOV-2001, integrated into UniProtKB/Swiss-Prot.
DT   01-MAY-2000, sequence version 1.
DT   25-MAY-2022, entry version 74.
DE   RecName: Full=Photosystem I reaction center subunit PsaK;
DE   AltName: Full=Photosystem I subunit X;
DE   Flags: Precursor;
GN   Name=psaK;
OS   Mastigocladus laminosus (Fischerella sp.).
OC   Bacteria; Cyanobacteria; Nostocales; Hapalosiphonaceae; Mastigocladus.
OX   NCBI_TaxID=83541;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RA   He Z.Y., Chitnis P.R., Nechushtai R.;
RT   "Molecular cloning of the psaK gene for photosystem I subunit X from the
RT   thermophilic cyanobacterium Mastigocladus laminosus.";
RL   Submitted (JUL-1999) to the EMBL/GenBank/DDBJ databases.
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}.
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DR   EMBL; AF170923; AAD50998.1; -; Genomic_DNA.
DR   AlphaFoldDB; Q9S3W9; -.
DR   SMR; Q9S3W9; -.
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   PROPEP          1..4
FT                   /evidence="ECO:0000250"
FT                   /id="PRO_0000029400"
FT   CHAIN           5..86
FT                   /note="Photosystem I reaction center subunit PsaK"
FT                   /id="PRO_0000029401"
FT   TRANSMEM        14..34
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        53..73
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
SQ   SEQUENCE   86 AA;  8841 MW;  D08A7A111D6FEE2C CRC64;
     MLTSTLLAAA TTPLQWSPTV GIIMILCNIV AIAFGKSTIQ YPNAGPALPS SQFFGGFGLP
     ALLATTAFGH ILGTGVILGL HNLGRF