ID   PSBX_PARMW              Reviewed;          40 AA.
AC   Q7U9C4;
DT   14-APR-2009, integrated into UniProtKB/Swiss-Prot.
DT   01-OCT-2003, sequence version 1.
DT   03-AUG-2022, entry version 86.
DE   RecName: Full=Photosystem II reaction center X protein {ECO:0000255|HAMAP-Rule:MF_01386};
GN   Name=psbX {ECO:0000255|HAMAP-Rule:MF_01386}; OrderedLocusNames=SYNW0334;
OS   Parasynechococcus marenigrum (strain WH8102).
OC   Bacteria; Cyanobacteria; Synechococcales; Prochlorococcaceae;
OC   Parasynechococcus; Parasynechococcus marenigrum.
OX   NCBI_TaxID=84588;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=WH8102;
RX   PubMed=12917641; DOI=10.1038/nature01943;
RA   Palenik B., Brahamsha B., Larimer F.W., Land M.L., Hauser L., Chain P.,
RA   Lamerdin J.E., Regala W., Allen E.E., McCarren J., Paulsen I.T.,
RA   Dufresne A., Partensky F., Webb E.A., Waterbury J.;
RT   "The genome of a motile marine Synechococcus.";
RL   Nature 424:1037-1042(2003).
CC   -!- FUNCTION: Involved in the binding and/or turnover of quinones at the
CC       Q(B) site of Photosystem II. {ECO:0000255|HAMAP-Rule:MF_01386}.
CC   -!- SUBUNIT: PSII consists of a core antenna complex that captures photons,
CC       and an electron transfer chain that converts photonic excitation into a
CC       charge separation. PSII forms dimeric complexes. {ECO:0000255|HAMAP-
CC       Rule:MF_01386}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000255|HAMAP-
CC       Rule:MF_01386}; Single-pass membrane protein {ECO:0000255|HAMAP-
CC       Rule:MF_01386}.
CC   -!- SIMILARITY: Belongs to the PsbX family. Type 1 subfamily.
CC       {ECO:0000255|HAMAP-Rule:MF_01386}.
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DR   EMBL; BX569689; CAE06849.1; -; Genomic_DNA.
DR   RefSeq; WP_011127208.1; NC_005070.1.
DR   AlphaFoldDB; Q7U9C4; -.
DR   SMR; Q7U9C4; -.
DR   STRING; 84588.SYNW0334; -.
DR   EnsemblBacteria; CAE06849; CAE06849; SYNW0334.
DR   KEGG; syw:SYNW0334; -.
DR   eggNOG; ENOG502ZJI0; Bacteria.
DR   HOGENOM; CLU_212837_1_0_3; -.
DR   OrthoDB; 2082627at2; -.
DR   BioCyc; MetaCyc:TX72_RS01685-MON; -.
DR   Proteomes; UP000001422; Chromosome.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR   GO; GO:0009523; C:photosystem II; 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   HAMAP; MF_01386; PSII_PsbX_1; 1.
DR   InterPro; IPR009518; PSII_PsbX.
DR   InterPro; IPR023431; PSII_PsbX_type_1_subfam.
DR   Pfam; PF06596; PsbX; 1.
PE   3: Inferred from homology;
KW   Membrane; Photosynthesis; Photosystem II; Thylakoid; Transmembrane;
KW   Transmembrane helix.
FT   CHAIN           1..40
FT                   /note="Photosystem II reaction center X protein"
FT                   /id="PRO_1000145155"
FT   TRANSMEM        10..30
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01386"
SQ   SEQUENCE   40 AA;  4325 MW;  53EF10711C254E81 CRC64;
     MTPSLSNFLS SLVWGGLIVV VPATIGLILI SQTDRLDRKL