AC   MF_01386;
DC   Protein; auto
TR   HAMAP; MF_01386; -; 1; level=0
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Names: PSII_PsbX_1
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ID   PSBX
DE   RecName: Full=Photosystem II reaction center protein X;
GN   Name=psbX;
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CC   -!- FUNCTION: Involved in the binding and/or turnover of quinones at the
CC       Q(B) site of photosystem II (PSII). PSII is a light-driven water
CC       plastoquinone oxidoreductase, using light energy to abstract electrons
CC       from H(2)O, generating a proton gradient subsequently used for ATP
CC       formation.
case <OC:Cyanobacteriota>
CC   -!- SUBUNIT: PSII is composed of 1 copy each of membrane proteins PsbA,
CC       PsbB, PsbC, PsbD, PsbE, PsbF, PsbH, PsbI, PsbJ, PsbK, PsbL, PsbM, PsbT,
CC       PsbX, PsbY, PsbZ, Psb30/Ycf12, peripheral proteins PsbO, CyanoQ (PsbQ),
CC       PsbU, PsbV and a large number of cofactors. It forms dimeric complexes.
else
CC   -!- SUBUNIT: PSII is composed of 1 copy each of membrane proteins PsbA,
CC       PsbB, PsbC, PsbD, PsbE, PsbF, PsbH, PsbI, PsbJ, PsbK, PsbL, PsbM, PsbT,
CC       PsbX, PsbY, PsbZ, Psb30/Ycf12, at least 3 peripheral proteins of the
CC       oxygen-evolving complex and a large number of cofactors. It forms
CC       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 PsbX family. Type 1 subfamily.
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DR   Pfam; PF06596; PsbX; 1; trigger=no
DR   General; Transmembrane; -; 1; trigger=yes
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KW   Membrane
KW   Photosynthesis
KW   Photosystem II
case <OC:Gloeobacter>
KW   Cell membrane
KW   Cell inner membrane
else
KW   Thylakoid
end case
KW   Transmembrane
KW   Transmembrane helix
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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   None
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Size: 36-41;
Related: MF_01388!;
Template: P72575; Q9F1R6;
Scope:
 Bacteria; Cyanobacteriota
 Plastid
Fusion:
 Nter: None
 Cter: None
Duplicate: in SYNJA
Plasmid: None
Comments: PsbX is not found in Viridiplantae, is found in some but not all other
 photosynthetic eukaryotes. There are 2 PsbX subfamilies; this one and a longer
 one found in most but not all Prochlorococcus.
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# Revision 1.12 2023/07/27
//