ID   PSBX_PROM1              Reviewed;          56 AA.
AC   A2BZN0;
DT   22-JUL-2008, integrated into UniProtKB/Swiss-Prot.
DT   20-FEB-2007, sequence version 1.
DT   03-AUG-2022, entry version 73.
DE   RecName: Full=Photosystem II reaction center X protein {ECO:0000255|HAMAP-Rule:MF_01388};
GN   Name=psbX {ECO:0000255|HAMAP-Rule:MF_01388}; OrderedLocusNames=NATL1_01261;
OS   Prochlorococcus marinus (strain NATL1A).
OC   Bacteria; Cyanobacteria; Synechococcales; Prochlorococcaceae;
OC   Prochlorococcus.
OX   NCBI_TaxID=167555;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=NATL1A;
RX   PubMed=18159947; DOI=10.1371/journal.pgen.0030231;
RA   Kettler G.C., Martiny A.C., Huang K., Zucker J., Coleman M.L., Rodrigue S.,
RA   Chen F., Lapidus A., Ferriera S., Johnson J., Steglich C., Church G.M.,
RA   Richardson P., Chisholm S.W.;
RT   "Patterns and implications of gene gain and loss in the evolution of
RT   Prochlorococcus.";
RL   PLoS Genet. 3:2515-2528(2007).
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_01388}.
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_01388}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000255|HAMAP-
CC       Rule:MF_01388}; Single-pass membrane protein {ECO:0000255|HAMAP-
CC       Rule:MF_01388}.
CC   -!- SIMILARITY: Belongs to the PsbX family. Type 2 subfamily.
CC       {ECO:0000255|HAMAP-Rule:MF_01388}.
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DR   EMBL; CP000553; ABM74690.1; -; Genomic_DNA.
DR   RefSeq; WP_011294057.1; NC_008819.1.
DR   AlphaFoldDB; A2BZN0; -.
DR   SMR; A2BZN0; -.
DR   STRING; 167555.NATL1_01261; -.
DR   EnsemblBacteria; ABM74690; ABM74690; NATL1_01261.
DR   KEGG; pme:NATL1_01261; -.
DR   eggNOG; ENOG5032E6T; Bacteria.
DR   HOGENOM; CLU_209178_0_0_3; -.
DR   OMA; NMIASFF; -.
DR   Proteomes; UP000002592; 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-KW.
DR   HAMAP; MF_01388; PSII_PsbX_2; 1.
DR   InterPro; IPR009518; PSII_PsbX.
DR   InterPro; IPR023428; PSII_PsbX_type_2_subfam.
DR   Pfam; PF06596; PsbX; 1.
PE   3: Inferred from homology;
KW   Membrane; Photosynthesis; Photosystem II; Thylakoid; Transmembrane;
KW   Transmembrane helix.
FT   CHAIN           1..56
FT                   /note="Photosystem II reaction center X protein"
FT                   /id="PRO_0000345375"
FT   TRANSMEM        27..47
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01388"
SQ   SEQUENCE   56 AA;  5577 MW;  D34ADC8A03670E06 CRC64;
     MAFHLLNLFL SAGTSSEAAT SSAVGMIGSF LAAGALIVAP AAAALIWVSQ KDALSR