ID   PSAK_PORPU              Reviewed;          86 AA.
AC   P51370;
DT   01-OCT-1996, integrated into UniProtKB/Swiss-Prot.
DT   01-OCT-1996, sequence version 1.
DT   25-MAY-2022, entry version 83.
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   Porphyra purpurea (Red seaweed) (Ulva purpurea).
OG   Plastid; Chloroplast.
OC   Eukaryota; Rhodophyta; Bangiophyceae; Bangiales; Bangiaceae; Porphyra.
OX   NCBI_TaxID=2787;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=Avonport;
RA   Reith M.E., Munholland J.;
RT   "Complete nucleotide sequence of the Porphyra purpurea chloroplast
RT   genome.";
RL   Plant Mol. Biol. Rep. 13:333-335(1995).
CC   -!- SUBCELLULAR LOCATION: Plastid, chloroplast thylakoid membrane
CC       {ECO:0000250}; Multi-pass membrane protein {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the PsaG/PsaK family. {ECO:0000305}.
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DR   EMBL; U38804; AAC08256.1; -; Genomic_DNA.
DR   PIR; S73291; S73291.
DR   RefSeq; NP_053980.1; NC_000925.1.
DR   AlphaFoldDB; P51370; -.
DR   SMR; P51370; -.
DR   GeneID; 810010; -.
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   TIGRFAMs; TIGR03049; PS_I_psaK; 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..86
FT                   /note="Photosystem I reaction center subunit PsaK"
FT                   /id="PRO_0000206216"
FT   TRANSMEM        20..39
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        61..79
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
SQ   SEQUENCE   86 AA;  8771 MW;  C441413D6B6B9FAD CRC64;
     MDILFVLSAV PHTSPWSTQV AMVMITCNLL AIVAGRYAIK VRGLGPSIPV SGVEGFGLPE
     LLATTSLGHV IGAASILGLS NVGLIS