ID   PSAK2_SYNY3             Reviewed;          90 AA.
AC   P74564;
DT   02-AUG-2002, integrated into UniProtKB/Swiss-Prot.
DT   02-AUG-2002, sequence version 2.
DT   27-MAR-2024, entry version 135.
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=sll0629;
OS   Synechocystis sp. (strain PCC 6803 / Kazusa).
OC   Bacteria; Cyanobacteriota; Cyanophyceae; Synechococcales; Merismopediaceae;
OC   Synechocystis.
OX   NCBI_TaxID=1111708;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=PCC 6803 / Kazusa;
RX   PubMed=8905231; DOI=10.1093/dnares/3.3.109;
RA   Kaneko T., Sato S., Kotani H., Tanaka A., Asamizu E., Nakamura Y.,
RA   Miyajima N., Hirosawa M., Sugiura M., Sasamoto S., Kimura T., Hosouchi T.,
RA   Matsuno A., Muraki A., Nakazaki N., Naruo K., Okumura S., Shimpo S.,
RA   Takeuchi C., Wada T., Watanabe A., Yamada M., Yasuda M., Tabata S.;
RT   "Sequence analysis of the genome of the unicellular cyanobacterium
RT   Synechocystis sp. strain PCC6803. II. Sequence determination of the entire
RT   genome and assignment of potential protein-coding regions.";
RL   DNA Res. 3:109-136(1996).
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=BAA18671.1; Type=Erroneous initiation; Note=Extended N-terminus.; Evidence={ECO:0000305};
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DR   EMBL; BA000022; BAA18671.1; ALT_INIT; Genomic_DNA.
DR   PIR; S76759; S76759.
DR   PDB; 4KT0; X-ray; 2.80 A; K=1-90.
DR   PDB; 4L6V; X-ray; 3.80 A; 0/K/k=1-90.
DR   PDB; 6HQB; X-ray; 4.00 A; K=18-87.
DR   PDB; 6UZV; EM; 3.10 A; 8/K/k=1-90.
DR   PDB; 7O1V; EM; 4.31 A; K=8-87.
DR   PDBsum; 4KT0; -.
DR   PDBsum; 4L6V; -.
DR   PDBsum; 6HQB; -.
DR   PDBsum; 6UZV; -.
DR   PDBsum; 7O1V; -.
DR   AlphaFoldDB; P74564; -.
DR   EMDB; EMD-12697; -.
DR   EMDB; EMD-20963; -.
DR   SMR; P74564; -.
DR   STRING; 1148.gene:10500437; -.
DR   PaxDb; 1148-1653760; -.
DR   EnsemblBacteria; BAA18671; BAA18671; BAA18671.
DR   KEGG; syn:sll0629; -.
DR   eggNOG; ENOG503323W; Bacteria.
DR   InParanoid; P74564; -.
DR   BioCyc; MetaCyc:MONOMER-16589; -.
DR   Proteomes; UP000001425; Chromosome.
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; Photosystem I PsaK, reaction centre; 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   NCBIfam; TIGR03049; PS_I_psaK; 1.
DR   Pfam; PF01241; PSI_PSAK; 1.
DR   SUPFAM; SSF81563; Photosystem I reaction center subunit X, PsaK; 1.
DR   PROSITE; PS01026; PHOTOSYSTEM_I_PSAGK; 1.
PE   1: Evidence at protein level;
KW   3D-structure; Membrane; Photosynthesis; Photosystem I; Reference proteome;
KW   Thylakoid; Transmembrane; Transmembrane helix.
FT   PROPEP          1..?
FT                   /evidence="ECO:0000255"
FT                   /id="PRO_0000029410"
FT   CHAIN           ?..90
FT                   /note="Photosystem I reaction center subunit PsaK 2"
FT                   /id="PRO_0000029411"
FT   TRANSMEM        20..42
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        67..89
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   HELIX           18..37
FT                   /evidence="ECO:0007829|PDB:4KT0"
FT   HELIX           53..57
FT                   /evidence="ECO:0007829|PDB:6UZV"
FT   HELIX           64..66
FT                   /evidence="ECO:0007829|PDB:4KT0"
FT   HELIX           67..88
FT                   /evidence="ECO:0007829|PDB:4KT0"
SQ   SEQUENCE   90 AA;  9306 MW;  1D1C642D3D12589B CRC64;
     MFNTALLLAQ ASPTTAGWSL SVGIIMCLCN VFAFVIGYFA IQKTGKGKDL ALPQLASKKT
     FGLPELLATM SFGHILGAGM VLGLASSGIL
//