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Oxidative phosphorylation is a highly efficient process that generates large amounts of adenosine triphosphate (ATP), the basic unit of energy that drives many cellular processes. Oxidative phosphorylation involves two processes— the electron transport chain and chemiosmosis.
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Related Experiment Video

Updated: Jul 28, 2026

Visualization of ATP Synthase Dimers in Mitochondria by Electron Cryo-tomography
10:39

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Published on: September 14, 2014

Catalytic site forms and controls in ATP synthase catalysis.

P D Boyer1

  • 1Molecular Biology Institute, University of California at Los Angeles, Los Angeles, CA 90095-1570, USA. pdboyer@ucla.edu

Biochimica Et Biophysica Acta
|June 6, 2000
PubMed
Summary

ATP synthase utilizes a minimal binding change mechanism involving 120-degree rotations for catalysis. Two substrate-bound sites suffice for high rates, with three-site occupancy occurring transiently.

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Area of Science:

  • Biochemistry
  • Enzyme kinetics
  • Molecular biology

Background:

  • ATP synthase catalyzes ATP synthesis and hydrolysis, crucial for cellular energy.
  • Understanding the catalytic mechanism, including substrate binding and conformational changes, is key.
  • Previous models proposed various mechanisms for ATP synthase function.

Purpose of the Study:

  • To present a minimal scheme for substrate binding and interconversion of catalytic sites in ATP synthase.
  • To evaluate intermediate forms, steps, and experimental evidence related to ATP synthase catalysis.
  • To assess the role of MgADP inhibition in understanding F1 ATPases.

Main Methods:

  • Theoretical modeling of substrate binding and catalytic site interconversion.
  • Review and evaluation of existing experimental data on ATP synthase function.
  • Analysis of energy-dependent steps, proton translocation, and transition state involvement.

Main Results:

  • A 120-degree rotation of gamma subunits relative to beta subunits drives catalytic site interconversion.
  • Near-maximal catalytic rates are achieved with substrate binding at two sites; three-site occupancy is transient.
  • Proposed key steps involve proton translocation-induced site deformation for ADP/Pi binding and ATP formation, and ATP binding preceding proton translocation in hydrolysis.

Conclusions:

  • A binding change mechanism involving specific rotational steps explains ATP synthase catalysis.
  • ADP binding is a critical regulator of rotation during ATP synthesis.
  • Further research is needed to elucidate specific intermediate steps and the impact of MgADP inhibition.