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Nonequilibrium dynamic mechanism for allosteric effect.

Jianhua Xing1

  • 1Chemistry, Materials and Life Sciences Directorate, University of California, Livermore, California 94550, USA. jxing@vt.edu

Physical Review Letters
|November 13, 2007
PubMed
Summary
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Regulating molecules may alter enzyme function by changing protein dynamics, not just thermodynamics. This new mechanism affects temperature dependence and enzyme activity patterns, with experimental tests proposed.

Area of Science:

  • Biochemistry
  • Chemical Physics
  • Enzyme Kinetics

Background:

  • Allosteric regulation is traditionally understood through thermodynamic principles.
  • Enzymatic reactions involve complex protein internal motions and potential energy barriers.
  • Existing models may not fully capture the dynamic nature of enzyme regulation.

Purpose of the Study:

  • To propose a new mechanism for allosteric regulation based on nonequilibrium protein dynamics.
  • To investigate how regulating molecules influence enzyme internal motions.
  • To predict distinct experimental signatures of this dynamic regulatory mechanism.

Main Methods:

  • Theoretical modeling of enzyme reaction cycles incorporating protein internal motions.
  • Analysis of how effector molecules perturb nonequilibrium protein dynamics.

Related Experiment Videos

  • Derivation of predictions for temperature dependence and waiting time distributions.

    • Main Results:

    • The proposed theory predicts altered temperature dependence for enzymes regulated by nonequilibrium dynamics.
    • Enzyme turnover cycle waiting time distributions are predicted to differ with and without effectors.
    • Dynamic fluctuation patterns of enzymes are expected to change in the presence of regulatory molecules.

    Conclusions:

    • Allosteric regulation may involve modulation of nonequilibrium protein dynamics, extending beyond thermodynamic control.
    • The proposed mechanism offers a new framework for understanding enzyme regulation.
    • Distinct, experimentally testable predictions are provided for validating the theory.