ID   PSBX_PROMP              Reviewed;          62 AA.
AC   Q7V3L3;
DT   22-JUL-2008, integrated into UniProtKB/Swiss-Prot.
DT   22-JUL-2008, sequence version 2.
DT   03-AUG-2022, entry version 80.
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=PMM0062;
OS   Prochlorococcus marinus subsp. pastoris (strain CCMP1986 / NIES-2087 /
OS   MED4).
OC   Bacteria; Cyanobacteria; Synechococcales; Prochlorococcaceae;
OC   Prochlorococcus.
OX   NCBI_TaxID=59919;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=CCMP1986 / NIES-2087 / MED4;
RX   PubMed=12917642; DOI=10.1038/nature01947;
RA   Rocap G., Larimer F.W., Lamerdin J.E., Malfatti S., Chain P., Ahlgren N.A.,
RA   Arellano A., Coleman M., Hauser L., Hess W.R., Johnson Z.I., Land M.L.,
RA   Lindell D., Post A.F., Regala W., Shah M., Shaw S.L., Steglich C.,
RA   Sullivan M.B., Ting C.S., Tolonen A., Webb E.A., Zinser E.R.,
RA   Chisholm S.W.;
RT   "Genome divergence in two Prochlorococcus ecotypes reflects oceanic niche
RT   differentiation.";
RL   Nature 424:1042-1047(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_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}.
CC   -!- SEQUENCE CAUTION:
CC       Sequence=CAE18521.1; Type=Erroneous initiation; Evidence={ECO:0000305};
CC   ---------------------------------------------------------------------------
CC   Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms
CC   Distributed under the Creative Commons Attribution (CC BY 4.0) License
CC   ---------------------------------------------------------------------------
DR   EMBL; BX548174; CAE18521.1; ALT_INIT; Genomic_DNA.
DR   RefSeq; WP_036930392.1; NC_005072.1.
DR   AlphaFoldDB; Q7V3L3; -.
DR   SMR; Q7V3L3; -.
DR   STRING; 59919.PMM0062; -.
DR   EnsemblBacteria; CAE18521; CAE18521; PMM0062.
DR   KEGG; pmm:PMM0062; -.
DR   HOGENOM; CLU_209178_0_0_3; -.
DR   OMA; NMIASFF; -.
DR   Proteomes; UP000001026; 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..62
FT                   /note="Photosystem II reaction center X protein"
FT                   /id="PRO_0000345376"
FT   TRANSMEM        26..46
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01388"
SQ   SEQUENCE   62 AA;  6599 MW;  C8E4BA2090249E97 CRC64;
     MIQISNLILA ADVSPEVAGS SGFNMIASFF AAALLIVIPA AAFLIFVSQK DSLERTSATR
     RR