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Related Experiment Videos

F1-ATPase: a highly efficient rotary ATP machine.

K Kinosita1, R Yasuda, H Noji

  • 1Department of Physics, Faculty of Science and Technology, Keio University, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.

Essays in Biochemistry
|December 11, 2002
PubMed
Summary
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The F1-ATPase molecular motor operates with 120-degree steps, maintaining constant torque and efficiency. This rotary motor converts chemical energy from ATP hydrolysis into mechanical work with near 100% efficiency.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biophysics

Background:

  • F1-ATPase functions as a rotary motor at the molecular level.
  • It comprises a central gamma subunit rotating within an alpha3 beta3 hexamer stator.

Purpose of the Study:

  • To investigate the mechanical properties and efficiency of the F1-ATPase molecular motor.
  • To understand the relationship between ATP hydrolysis and mechanical work output.

Main Methods:

  • Observation of single F1-ATPase molecule rotation.
  • Measurement of torque and mechanical work at discrete steps.
  • Analysis of efficiency under varying load and speed conditions.

Main Results:

  • The motor operates in discrete 120-degree steps.

Related Experiment Videos

  • Constant torque of 40 pN.nm is produced over a range of conditions.
  • Mechanical work per ATP is 80-90 pN.nm, near the free energy of ATP hydrolysis.

    • Conclusions:

    • F1-ATPase operates with remarkable efficiency, approaching 100%.
    • The motor's consistent performance highlights its effectiveness in energy transduction.