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Related Experiment Videos

F1-ATPase changes its conformations upon phosphate release.

Tomoko Masaike1, Eiro Muneyuki, Hiroyuki Noji

  • 1Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, 226-8503, Japan.

The Journal of Biological Chemistry
|March 7, 2002
PubMed
Summary

The F1-ATPase motor protein undergoes conformational changes upon phosphate release, similar to other motor proteins like myosin and kinesin. This study used a tryptophan mutation to detect these key molecular movements.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biophysics

Background:

  • Motor proteins like myosin and kinesin utilize switch II loop sensors for conformational changes essential for motility.
  • F1-ATPase is a rotary motor protein that functions through conformational changes.
  • Understanding the molecular mechanisms of F1-ATPase is crucial for elucidating energy transduction in biological systems.

Purpose of the Study:

  • To investigate conformational changes in F1-ATPase upon phosphate release.
  • To determine if F1-ATPase shares common motility mechanisms with other motor proteins.
  • To probe the role of specific residues in F1-ATPase conformational dynamics.

Main Methods:

  • Site-directed mutagenesis was used to introduce a tryptophan mutation at residue 333 in the beta subunit of F1-ATPase from thermophilic Bacillus PS3.

Related Experiment Videos

  • Trp fluorescence was monitored upon ATP addition to the mutant F1 subcomplex (alpha3beta(R333W)3gamma).
  • Phosphate release kinetics were measured using phosphate-binding protein assays.

    • Main Results:

    • ATP binding to the mutant F1-ATPase induced transient changes in Trp fluorescence, indicating conformational alterations.
    • The decay rate of Trp fluorescence correlated well with the rate of phosphate release.
    • This provides the first evidence of beta subunit conformational changes linked to phosphate release in F1-ATPase.

    Conclusions:

    • F1-ATPase exhibits conformational changes upon phosphate release, a mechanism potentially shared with other rotary and linear motor proteins.
    • The study highlights the conserved nature of molecular mechanisms underlying protein motility.
    • The findings contribute to a deeper understanding of the structure-function relationship in ATP-driven molecular motors.