ID   PSBX_PROM9              Reviewed;          61 AA.
AC   Q31DC0;
DT   22-JUL-2008, integrated into UniProtKB/Swiss-Prot.
DT   06-DEC-2005, sequence version 1.
DT   03-AUG-2022, entry version 72.
DE   RecName: Full=Photosystem II reaction center X protein {ECO:0000255|HAMAP-Rule:MF_01388};
GN   Name=psbX {ECO:0000255|HAMAP-Rule:MF_01388};
GN   OrderedLocusNames=PMT9312_0064;
OS   Prochlorococcus marinus (strain MIT 9312).
OC   Bacteria; Cyanobacteria; Synechococcales; Prochlorococcaceae;
OC   Prochlorococcus.
OX   NCBI_TaxID=74546;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=MIT 9312;
RG   US DOE Joint Genome Institute;
RA   Copeland A., Lucas S., Lapidus A., Barry K., Detter J.C., Glavina T.,
RA   Hammon N., Israni S., Pitluck S., Thiel J., Schmutz J., Larimer F.,
RA   Land M., Kyrpides N., Lykidis A., Richardson P.;
RT   "Complete sequence of Prochlorococcus marinus str. MIT 9312.";
RL   Submitted (JUL-2005) to the EMBL/GenBank/DDBJ databases.
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; CP000111; ABB49125.1; -; Genomic_DNA.
DR   RefSeq; WP_011375628.1; NC_007577.1.
DR   AlphaFoldDB; Q31DC0; -.
DR   SMR; Q31DC0; -.
DR   STRING; 74546.PMT9312_0064; -.
DR   EnsemblBacteria; ABB49125; ABB49125; PMT9312_0064.
DR   KEGG; pmi:PMT9312_0064; -.
DR   HOGENOM; CLU_209178_0_0_3; -.
DR   OMA; NMIASFF; -.
DR   OrthoDB; 2042215at2; -.
DR   Proteomes; UP000002715; 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..61
FT                   /note="Photosystem II reaction center X protein"
FT                   /id="PRO_0000345373"
FT   TRANSMEM        26..46
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01388"
SQ   SEQUENCE   61 AA;  6461 MW;  1523759DCB881FFF CRC64;
     MFQISNLLLA ADFSSEVANN SAVGMIGSFI AAALLIVIPA TAFLIFVSQK DSLNRTSTGR
     R