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Dynamically driven protein allostery.

Nataliya Popovych1, Shangjin Sun, Richard H Ebright

  • 1Department of Chemistry, Rutgers University, Newark, New Jersey 07102, USA.

Nature Structural & Molecular Biology
|August 15, 2006
PubMed
Summary
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Allostery, or remote molecular communication, can be driven solely by protein dynamics, not just conformational changes. This study reveals how protein motions, not structure, dictate the negative cooperativity of cyclic AMP binding to catabolite activator protein.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Allosteric regulation typically involves conformational changes transmitted through protein structures.
  • Understanding the mechanisms of allosteric communication is crucial for drug discovery and molecular biology.

Purpose of the Study:

  • To investigate if allosteric interactions can be mediated exclusively by changes in protein dynamics.
  • To characterize the negative cooperativity of cyclic AMP (cAMP) binding to the dimeric catabolite activator protein (CAP).

Main Methods:

  • Characterization of cAMP binding to dimeric CAP at discrete conformational states.
  • Analysis of protein dynamics and conformational entropy changes upon sequential ligand binding.

Main Results:

Related Experiment Videos

  • The first cAMP binding to CAP does not alter the other subunit's conformation.
  • Sequential cAMP binding modulates protein dynamics, with the second binding event quenching motions.
  • A significant conformational entropic penalty upon second cAMP binding drives the observed negative cooperativity.

Conclusions:

  • Allosteric regulation can be driven purely by transmitted changes in protein dynamics.
  • Protein dynamics play a critical role in mediating allosteric effects, independent of major conformational shifts.
  • This finding offers a new perspective on allosteric mechanisms and their modulation.