ID   PSBH_CYAPA              Reviewed;          67 AA.
AC   P48105;
DT   01-FEB-1996, integrated into UniProtKB/Swiss-Prot.
DT   01-FEB-1996, sequence version 1.
DT   25-MAY-2022, entry version 77.
DE   RecName: Full=Photosystem II reaction center protein H {ECO:0000255|HAMAP-Rule:MF_00752};
DE            Short=PSII-H {ECO:0000255|HAMAP-Rule:MF_00752};
GN   Name=psbH {ECO:0000255|HAMAP-Rule:MF_00752};
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: One of the components of the core complex of photosystem II
CC       (PSII), required for its stability and/or assembly. PSII is a light-
CC       driven water:plastoquinone oxidoreductase that uses light energy to
CC       abstract electrons from H(2)O, generating O(2) and a proton gradient
CC       subsequently used for ATP formation. It consists of a core antenna
CC       complex that captures photons, and an electron transfer chain that
CC       converts photonic excitation into a charge separation.
CC       {ECO:0000255|HAMAP-Rule:MF_00752}.
CC   -!- SUBUNIT: PSII is composed of 1 copy each of membrane proteins PsbA,
CC       PsbB, PsbC, PsbD, numerous small proteins, at least 3 peripheral
CC       proteins of the oxygen-evolving complex and a large number of
CC       cofactors. It forms dimeric complexes. {ECO:0000255|HAMAP-
CC       Rule:MF_00752}.
CC   -!- SUBCELLULAR LOCATION: Plastid, cyanelle thylakoid membrane
CC       {ECO:0000255|HAMAP-Rule:MF_00752}; Single-pass membrane protein
CC       {ECO:0000255|HAMAP-Rule:MF_00752}.
CC   -!- SIMILARITY: Belongs to the PsbH family. {ECO:0000255|HAMAP-
CC       Rule:MF_00752}.
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DR   EMBL; U30821; AAA81200.1; -; Genomic_DNA.
DR   PIR; T06857; T06857.
DR   RefSeq; NP_043169.1; NC_001675.1.
DR   AlphaFoldDB; P48105; -.
DR   SMR; P48105; -.
DR   GeneID; 801642; -.
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:0042301; F:phosphate ion binding; IEA:InterPro.
DR   GO; GO:0015979; P:photosynthesis; IEA:UniProtKB-UniRule.
DR   GO; GO:0050821; P:protein stabilization; IEA:InterPro.
DR   Gene3D; 1.20.5.880; -; 1.
DR   HAMAP; MF_00752; PSII_PsbH; 1.
DR   InterPro; IPR001056; PSII_PsbH.
DR   InterPro; IPR036863; PSII_PsbH_sf.
DR   PANTHER; PTHR34469; PTHR34469; 1.
DR   Pfam; PF00737; PsbH; 1.
DR   SUPFAM; SSF161025; SSF161025; 1.
PE   3: Inferred from homology;
KW   Cyanelle; Membrane; Photosynthesis; Photosystem II; Plastid; Thylakoid;
KW   Transmembrane; Transmembrane helix.
FT   CHAIN           1..67
FT                   /note="Photosystem II reaction center protein H"
FT                   /id="PRO_0000070507"
FT   TRANSMEM        29..49
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00752"
SQ   SEQUENCE   67 AA;  7442 MW;  2D8104AA535762C9 CRC64;
     MPQRTALGNI LRPLNSEYGK VAPGWGTTPL MAVFMLLFFV FLLIIIQIYN SSLLLENVQV
     SWTAATA