ID   PSBE_CYAM1              Reviewed;          81 AA.
AC   Q85FQ2;
DT   01-MAR-2005, integrated into UniProtKB/Swiss-Prot.
DT   01-JUN-2003, sequence version 1.
DT   03-AUG-2022, entry version 99.
DE   RecName: Full=Cytochrome b559 subunit alpha {ECO:0000255|HAMAP-Rule:MF_00642};
DE   AltName: Full=PSII reaction center subunit V {ECO:0000255|HAMAP-Rule:MF_00642};
GN   Name=psbE {ECO:0000255|HAMAP-Rule:MF_00642};
OS   Cyanidioschyzon merolae (strain NIES-3377 / 10D) (Unicellular red alga).
OG   Plastid; Chloroplast.
OC   Eukaryota; Rhodophyta; Bangiophyceae; Cyanidiales; Cyanidiaceae;
OC   Cyanidioschyzon.
OX   NCBI_TaxID=280699;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=NIES-3377 / 10D;
RX   PubMed=12755171; DOI=10.1093/dnares/10.2.67;
RA   Ohta N., Matsuzaki M., Misumi O., Miyagishima S.-Y., Nozaki H., Tanaka K.,
RA   Shin-i T., Kohara Y., Kuroiwa T.;
RT   "Complete sequence and analysis of the plastid genome of the unicellular
RT   red alga Cyanidioschyzon merolae.";
RL   DNA Res. 10:67-77(2003).
CC   -!- FUNCTION: This b-type cytochrome is tightly associated with the
CC       reaction center of photosystem II (PSII). PSII is a light-driven
CC       water:plastoquinone oxidoreductase that uses light energy to abstract
CC       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_00642}.
CC   -!- COFACTOR:
CC       Name=heme b; Xref=ChEBI:CHEBI:60344;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00642};
CC       Note=With its partner (PsbF) binds heme. PSII binds additional
CC       chlorophylls, carotenoids and specific lipids. {ECO:0000255|HAMAP-
CC       Rule:MF_00642};
CC   -!- SUBUNIT: Heterodimer of an alpha subunit and a beta subunit. PSII is
CC       composed of 1 copy each of membrane proteins PsbA, PsbB, PsbC, PsbD,
CC       PsbE, PsbF, PsbH, PsbI, PsbJ, PsbK, PsbL, PsbM, PsbT, PsbX, PsbY, PsbZ,
CC       Ycf12, at least 3 peripheral proteins of the oxygen-evolving complex
CC       and a large number of cofactors. It forms dimeric complexes.
CC       {ECO:0000255|HAMAP-Rule:MF_00642}.
CC   -!- SUBCELLULAR LOCATION: Plastid, chloroplast thylakoid membrane
CC       {ECO:0000255|HAMAP-Rule:MF_00642}; Single-pass membrane protein
CC       {ECO:0000255|HAMAP-Rule:MF_00642}.
CC   -!- SIMILARITY: Belongs to the PsbE/PsbF family. {ECO:0000255|HAMAP-
CC       Rule:MF_00642}.
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DR   EMBL; AB002583; BAC76293.1; -; Genomic_DNA.
DR   RefSeq; NP_849131.1; NC_004799.1.
DR   AlphaFoldDB; Q85FQ2; -.
DR   SMR; Q85FQ2; -.
DR   STRING; 45157.CMV231CT; -.
DR   EnsemblPlants; CMV231CT; CMV231CT; CMV231C.
DR   GeneID; 844950; -.
DR   Gramene; CMV231CT; CMV231CT; CMV231C.
DR   KEGG; cme:CymeCp199; -.
DR   eggNOG; ENOG502S3QA; Eukaryota.
DR   HOGENOM; CLU_194095_0_0_1; -.
DR   Proteomes; UP000007014; Chloroplast.
DR   GO; GO:0009535; C:chloroplast thylakoid membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR   GO; GO:0009539; C:photosystem II reaction center; IEA:InterPro.
DR   GO; GO:0009055; F:electron transfer activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0020037; F:heme binding; IEA:InterPro.
DR   GO; GO:0005506; F:iron ion binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0009767; P:photosynthetic electron transport chain; IEA:InterPro.
DR   Gene3D; 1.20.5.860; -; 1.
DR   HAMAP; MF_00642; PSII_PsbE; 1.
DR   InterPro; IPR006217; PSII_cyt_b559_asu.
DR   InterPro; IPR037025; PSII_cyt_b559_asu_sf.
DR   InterPro; IPR006216; PSII_cyt_b559_CS.
DR   InterPro; IPR013081; PSII_cyt_b559_N.
DR   InterPro; IPR013082; PSII_cytb559_asu_lum.
DR   Pfam; PF00283; Cytochrom_B559; 1.
DR   Pfam; PF00284; Cytochrom_B559a; 1.
DR   PIRSF; PIRSF000036; PsbE; 1.
DR   TIGRFAMs; TIGR01332; cyt_b559_alpha; 1.
DR   PROSITE; PS00537; CYTOCHROME_B559; 1.
PE   3: Inferred from homology;
KW   Chloroplast; Electron transport; Heme; Iron; Membrane; Metal-binding;
KW   Photosynthesis; Photosystem II; Plastid; Reference proteome; Thylakoid;
KW   Transmembrane; Transmembrane helix; Transport.
FT   CHAIN           1..81
FT                   /note="Cytochrome b559 subunit alpha"
FT                   /id="PRO_0000200307"
FT   TRANSMEM        22..36
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00642"
FT   BINDING         24
FT                   /ligand="heme"
FT                   /ligand_id="ChEBI:CHEBI:30413"
FT                   /ligand_note="ligand shared with beta subunit"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00642"
SQ   SEQUENCE   81 AA;  9209 MW;  A0232131CD4FFF9C CRC64;
     MAGGSTGERP FSDIITSIRY WVIHSITIPS LFIAGWLFVS TGLAYDVFGT PRPNEYFTQE
     RTQIPLVNDR FNAKQELEDL L