ATP synthase subunit beta, mitochondrial - Q9GPE9 (ATPB_TRYBB)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

Mitochondrial membrane ATP synthase (F(1)F(o) ATP synthase) produces ATP from ADP in the presence of a proton gradient across the membrane which is generated by electron transport complexes of the respiratory chain (PubMed:19436713, PubMed:29247468). F-type ATPases consist of two structural domains, F(1) - containing the extramembraneous catalytic core, and F(o) - containing the membrane proton channel, linked together by a central stalk and a peripheral stalk (PubMed:19436713, PubMed:29247468, PubMed:29440423). During catalysis, ATP synthesis in the catalytic domain of F(1) is coupled via a rotary mechanism of the central stalk subunits to proton translocation. Subunits alpha and beta form the catalytic core in F(1) (PubMed:19436713, PubMed:29440423). Rotation of the central stalk against the surrounding alpha(3)beta(3) subunits leads to hydrolysis of ATP in three separate catalytic sites on the beta subunits (Probable). Contrary to the procyclic, insect form that requires F(1)F(o) ATP synthase for ATP synthesis, the bloodstream form relies on ATP hydrolysis by F(1)F(o) ATP synthase to maintain its mitochondrial membrane potential (PubMed:29247468). UniProt
Catalytic Activity
ATP + 4 H+in + H2O = ADP + 5 H+out + phosphate UniProt
Pathway Maps
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Subunit Structure
F-type ATPases have 2 components, F(1) - the catalytic core - and F(o) - the membrane proton channel. F(1) has five subunits: alpha(3), beta(3), gamma(1), delta(1), epsilon(1), plus the additional subunit P18 (Tb427.05.1710) that is not present in F(1)F(o) ATP synthase from metazoa (PubMed:19436713, PubMed:29247468, PubMed:29440423). Subunit P18 (Tb927.5.1710) interacts with the alpha subunit with a 1:1 stoichiometry; the interaction is direct (PubMed:29440423). Subunit gamma is part of the central stalk (PubMed:29440423). F(o) has three main subunits: a, b and c (PubMed:19436713). The trypanosomal ATPase complex contains additional subunits that are not present in the F(1)F(o) ATP synthase from metazoa (PubMed:19436713, PubMed:29247468, PubMed:29440423). UniProt
  • Other Gene names: Tb427.03.1380
This protein in other organisms (by gene name):
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Data in yellow originates from Pfam  , by interacting with the HMMER3 web site  
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Data in orange originates from the SCOP   (version 1.75) and SCOPe   (version 2.04) classifications.
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  • Red: potentially disorderd region
  • Blue: probably ordered region.
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Data in lilac represent the genomic exon structure projected onto the UniProt sequence.
Data in blue originates from PDB
  • Secstruc: Secondary structure projected from representative PDB entries onto the UniProt sequence.
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The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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