ID   PSBX_CYAPA              Reviewed;          39 AA.
AC   P48266;
DT   01-FEB-1996, integrated into UniProtKB/Swiss-Prot.
DT   01-FEB-1996, sequence version 1.
DT   25-MAY-2022, entry version 55.
DE   RecName: Full=Photosystem II reaction center X protein {ECO:0000255|HAMAP-Rule:MF_01386};
GN   Name=psbX {ECO:0000255|HAMAP-Rule:MF_01386};
OS   Cyanophora paradoxa.
OG   Plastid; Cyanelle.
OC   Eukaryota; Glaucocystophyceae; Cyanophoraceae; Cyanophora.
OX   NCBI_TaxID=2762;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=UTEX LB 555 / Pringsheim;
RA   Stirewalt V.L., Michalowski C.B., Loeffelhardt W., Bohnert H.J.,
RA   Bryant D.A.;
RT   "Nucleotide sequence of the cyanelle DNA from Cyanophora paradoxa.";
RL   Plant Mol. Biol. Rep. 13:327-332(1995).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=UTEX LB 555 / Pringsheim;
RA   Loeffelhardt W., Stirewalt V.L., Michalowski C.B., Annarella M.,
RA   Farley J.Y., Schluchter W.M., Chung S., Newmann-Spallart C., Steiner J.M.,
RA   Jakowitsch J., Bohnert H.J., Bryant D.A.;
RT   "The complete sequence of the cyanelle genome of Cyanophora paradoxa: the
RT   genetic complexity of a primitive plastid.";
RL   (In) Schenk H.E.A., Herrmann R., Jeon K.W., Mueller N.E., Schwemmler W.
RL   (eds.);
RL   Eukaryotism and symbiosis, pp.40-48, Springer-Verlag, Heidelberg (1997).
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: Plastid, cyanelle thylakoid membrane
CC       {ECO:0000250}; 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; U30821; AAA81283.1; -; Genomic_DNA.
DR   PIR; T06940; T06940.
DR   RefSeq; NP_043252.1; NC_001675.1.
DR   AlphaFoldDB; P48266; -.
DR   SMR; P48266; -.
DR   GeneID; 801603; -.
DR   GO; GO:0033115; C:cyanelle thylakoid membrane; IEA:UniProtKB-SubCell.
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: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   Cyanelle; Membrane; Photosynthesis; Photosystem II; Plastid; Thylakoid;
KW   Transmembrane; Transmembrane helix.
FT   CHAIN           1..39
FT                   /note="Photosystem II reaction center X protein"
FT                   /id="PRO_0000217287"
FT   TRANSMEM        11..31
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01386"
SQ   SEQUENCE   39 AA;  4246 MW;  FC42C8907B8E96B2 CRC64;
     MTSSLSAFIN SLLWGAIVVV IPLSAALLFI SQKDKIQRN