AC   MF_00589;
DC   Protein; auto
TR   HAMAP; MF_00589; -; 1; level=0
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Names: PSII_PsbU
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ID   PSBU
DE   RecName: Full=Photosystem II extrinsic protein U;
DE            Short=PSII-U;
DE            Short=PsbU;
DE   AltName: Full=Photosystem II 12 kDa extrinsic protein;
DE            Short=PS II complex 12 kDa extrinsic protein;
DE   Flags: Precursor;
GN   Name=psbU;
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CC   -!- FUNCTION: One of the extrinsic, lumenal subunits of photosystem II
CC       (PSII). PSII is a light-driven water plastoquinone oxidoreductase,
CC       using light energy to abstract electrons from H(2)O, generating a
CC       proton gradient subsequently used for ATP formation. The extrinsic
CC       proteins stabilize the structure of photosystem II oxygen-evolving
CC       complex (OEC), the ion environment of oxygen evolution and protect the
CC       OEC against heat-induced inactivation.
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.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane; Peripheral membrane
CC       protein; Lumenal side.
CC   -!- SIMILARITY: Belongs to the PsbU family.
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DR   Pfam; PF06514; PsbU; 1; trigger=no
DR   General; Signal; -; 1; trigger=yes
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KW   Electron transport
KW   Membrane
KW   Photosynthesis
KW   Photosystem II
KW   Thylakoid
KW   Transport
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GO   GO:0015979; P:photosynthesis
GO   GO:0042651; C:thylakoid membrane
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FT   None
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Size: 120-143;
Related: None;
Template: Q55332; Q9F1L5;
Scope:
 Bacteria; Cyanobacteriota
Fusion:
 Nter: None
 Cter: None
Duplicate: None
Plasmid: None
Comments: GLOVI is very divergent, and hence atypical. For a review on the
 composition of the oxygen-evolving complex see:
 PubMed=17200881; DOI=10.1007/s11120-006-9117-1;
 Roose J.L., Wegener K.M., Pakrasi H.B.;
 "The extrinsic proteins of Photosystem II.";
 Photosyn. Res. 92:369-387(2007).
 PsbU is found in some non-Viridiplantae algae, but the protein is not detected
 by this rule.
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# Revision 1.26 2023/07/31
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