During mitochondrial ATP synthesis, F1-ATPase-the portion of the ATP synthase that contains the catalytic and regulatory nucleotide binding sites-undergoes a series of concerted conformational changes that couple proton translocation to the synthesis of the high levels of ATP required for cellular function ...
During mitochondrial ATP synthesis, F1-ATPase-the portion of the ATP synthase that contains the catalytic and regulatory nucleotide binding sites-undergoes a series of concerted conformational changes that couple proton translocation to the synthesis of the high levels of ATP required for cellular function. In the structure of the rat liver F1-ATPase, determined to 2.8-A resolution in the presence of physiological concentrations of nucleotides, all three beta subunits contain bound nucleotide and adopt similar conformations. This structure provides the missing configuration of F1 necessary to define all intermediates in the reaction pathway. Incorporation of this structure suggests a mechanism of ATP synthesis/hydrolysis in which configurations of the enzyme with three bound nucleotides play an essential role.
Related Citations:
The Three-Dimensional Structure of Rat Liver Mitochondria F1-ATPase: X-Ray Diffraction Studies Bianchet, M.A., Medjahed, D., Hullihen, J., Pedersen, P.L., Amzel, L.M. (1994) Biochim Biophys Acta 1187: 163
Quaternary Structure of ATP Synthases: Symmetry and Asymmetry in the F1 Moiety Amzel, L.M., Bianchet, M.A., Pedersen, P.L. (1992) J Bioenerg Biomembr 24: 429
Quaternary Structure of ATP Synthases: Symmetry and Asymmetry in the F1 Moiety Bianchet, M.A., Ysernhullihen, J., Pedersen, P.L., Amzel, L.M. (1991) J Biol Chem 266: 21197
Organizational Affiliation:
Department of Biophysics and Biophysical Chemistry, The Johns Hopkins University School of Medicine, 725 North Wolfe Street, Baltimore, MD 21205-2185, USA. mario@neruda.med.jhmi.edu
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