AC   MF_00642;
DC   Protein; auto
TR   HAMAP; MF_00642; -; 1; level=0
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Names: PSII_PsbE
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ID   PSBE
DE   RecName: Full=Cytochrome b559 subunit alpha;
DE   AltName: Full=PSII reaction center subunit V;
GN   Name=psbE;
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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   -!- COFACTOR:
CC       Name=heme b; Xref=ChEBI:CHEBI:60344;
CC       Note=With its partner (PsbF) binds heme. PSII binds additional
CC       chlorophylls, carotenoids and specific lipids.;
case <OC:Cyanobacteriota>
CC   -!- SUBUNIT: Heterodimer of an alpha subunit and 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       Psb30/Ycf12, peripheral proteins PsbO, CyanoQ (PsbQ), PsbU, PsbV and a
CC       large number of cofactors. It forms dimeric complexes.
else
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       Psb30/Ycf12, at least 3 peripheral proteins of the oxygen-evolving
CC       complex and a large number of cofactors. It forms dimeric complexes.
end case
case <OG:Chloroplast>
CC   -!- SUBCELLULAR LOCATION: Plastid, chloroplast thylakoid membrane; Single-
CC       pass membrane protein.
else case <OC:Gloeobacter>
CC   -!- SUBCELLULAR LOCATION: Cell inner membrane; Single-pass membrane
CC       protein.
else
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane; Single-pass membrane
CC       protein.
end case
CC   -!- SIMILARITY: Belongs to the PsbE/PsbF family.
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DR   Pfam; PF00283; Cytochrom_B559; 1; trigger=no
DR   Pfam; PF00284; Cytochrom_B559a; 1; trigger=no
DR   PIRSF; PIRSF000036; PsbE; 1; trigger=no
DR   NCBIfam; TIGR01332; Cyt_b559_alpha; 1; trigger=no
DR   PROSITE; PS00537; CYTOCHROME_B559; 1; trigger=no
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KW   Photosynthesis
KW   Photosystem II
KW   Heme
KW   Iron
KW   Metal-binding
KW   Transport
KW   Electron transport
case <OC:Gloeobacter>
KW   Cell membrane
KW   Cell inner membrane
else
KW   Thylakoid
end case
KW   Membrane
KW   Transmembrane
KW   Transmembrane helix
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GO   GO:0009055; F:electron transfer activity
GO   GO:0005506; F:iron ion binding
GO   GO:0015979; P:photosynthesis
case <OG:Chloroplast>
GO   GO:0009535; C:chloroplast thylakoid membrane
else case <OC:Gloeobacter>
GO   GO:0005886; C:plasma membrane
else
GO   GO:0042651; C:thylakoid membrane
end case
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FT   From: PSBE_THEVL (P12238)
FT   TRANSMEM        21..35
FT                   /note="Helical"
FT   BINDING         23
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   Condition: H
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Size: 73-84;
Related: MF_00643;
Template: P69383; P09190; Q8DIP0; P12238;
Scope:
 Bacteria; Cyanobacteriota
 Plastid
Fusion:
 Nter: None
 Cter: None
Duplicate: None
Plasmid: None
Comments: None
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# Revision 1.49 2023/06/20
//