ID   PSBK_TRIV2              Reviewed;          45 AA.
AC   Q3M4K0;
DT   15-JAN-2008, integrated into UniProtKB/Swiss-Prot.
DT   25-OCT-2005, sequence version 1.
DT   25-MAY-2022, entry version 76.
DE   RecName: Full=Photosystem II reaction center protein K {ECO:0000255|HAMAP-Rule:MF_00441};
DE            Short=PSII-K {ECO:0000255|HAMAP-Rule:MF_00441};
DE   Flags: Precursor;
GN   Name=psbK {ECO:0000255|HAMAP-Rule:MF_00441}; OrderedLocusNames=Ava_4488;
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).
CC   -!- FUNCTION: One of the components of the core complex of photosystem II
CC       (PSII). PSII is a light-driven water:plastoquinone oxidoreductase that
CC       uses light energy to abstract electrons from H(2)O, generating O(2) and
CC       a proton gradient subsequently used for ATP formation. It consists of a
CC       core antenna complex that captures photons, and an electron transfer
CC       chain that converts photonic excitation into a charge separation.
CC       {ECO:0000255|HAMAP-Rule:MF_00441}.
CC   -!- SUBUNIT: Cyanobacterial PSII is composed of 1 copy each of membrane
CC       proteins PsbA, PsbB, PsbC, PsbD, PsbE, PsbF, PsbH, PsbI, PsbJ, PsbK,
CC       PsbL, PsbM, PsbT, PsbX, PsbY, PsbZ, Ycf12, at least 3 peripheral
CC       proteins PsbO, PsbU, PsbV and a large number of cofactors. It forms
CC       dimeric complexes. {ECO:0000255|HAMAP-Rule:MF_00441}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000255|HAMAP-
CC       Rule:MF_00441}; Single-pass membrane protein {ECO:0000255|HAMAP-
CC       Rule:MF_00441}.
CC   -!- SIMILARITY: Belongs to the PsbK family. {ECO:0000255|HAMAP-
CC       Rule:MF_00441}.
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DR   EMBL; CP000117; ABA24086.1; -; Genomic_DNA.
DR   RefSeq; WP_010995059.1; NC_007413.1.
DR   AlphaFoldDB; Q3M4K0; -.
DR   SMR; Q3M4K0; -.
DR   STRING; 240292.Ava_4488; -.
DR   EnsemblBacteria; ABA24086; ABA24086; Ava_4488.
DR   GeneID; 58722060; -.
DR   KEGG; ava:Ava_4488; -.
DR   eggNOG; ENOG5032YQR; Bacteria.
DR   HOGENOM; CLU_174355_0_0_3; -.
DR   Proteomes; UP000002533; Chromosome.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR   GO; GO:0009539; C:photosystem II reaction center; IEA:InterPro.
DR   GO; GO:0031676; C:plasma membrane-derived thylakoid membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0015979; P:photosynthesis; IEA:UniProtKB-UniRule.
DR   HAMAP; MF_00441; PSII_PsbK; 1.
DR   InterPro; IPR003687; PSII_PsbK.
DR   InterPro; IPR037270; PSII_PsbK_sf.
DR   PANTHER; PTHR35325; PTHR35325; 1.
DR   Pfam; PF02533; PsbK; 1.
DR   SUPFAM; SSF161037; SSF161037; 1.
PE   3: Inferred from homology;
KW   Membrane; Photosynthesis; Photosystem II; Reaction center; Thylakoid;
KW   Transmembrane; Transmembrane helix.
FT   PROPEP          1..8
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00441"
FT                   /id="PRO_0000316073"
FT   CHAIN           9..45
FT                   /note="Photosystem II reaction center protein K"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00441"
FT                   /id="PRO_1000025976"
FT   TRANSMEM        24..44
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00441"
SQ   SEQUENCE   45 AA;  5060 MW;  2F7574C394A32846 CRC64;
     MEAALLLAKL PEAYQIFDPL VDVLPIIPVF FLLLAFVWQA AVGFR