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Protein activity regulation by conformational entropy.

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Protein dynamics, not just structure, dictate function. Changes in conformational entropy and internal motions regulate protein-ligand interactions, impacting DNA binding affinity in catabolite activator protein variants.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Biophysics

Background:

  • Protein function is regulated by a complex interplay between static structure and dynamic internal motions.
  • Existing models often fail to explain functional changes solely based on structural data, highlighting a gap in understanding dynamic contributions.
  • The quantitative role of internal protein dynamics in regulating biological activity remains largely elusive.

Purpose of the Study:

  • To investigate how changes in protein internal dynamics, specifically conformational entropy, influence protein-ligand interactions.
  • To elucidate the quantitative contributions of fast and slow internal dynamics to protein binding activity.
  • To determine if conformational entropy changes can dictate binding events even with identical binding interfaces.

Main Methods:

  • Utilized Nuclear Magnetic Resonance (NMR) spectroscopy to analyze structural and dynamic changes.
  • Studied DNA binding to various catabolite activator protein (CAP) variants with differing populations of active and inactive states.
  • Integrated NMR data with thermodynamic measurements.

Main Results:

  • Demonstrated that conformational entropy changes significantly impact protein-ligand binding affinity, even when binding interfaces are structurally identical.
  • Observed marked differences in DNA binding affinities among CAP variants, despite conserved binding interfaces.
  • Showed that conformational entropy can either inhibit or stimulate binding, depending on the protein variant's dynamic state.

Conclusions:

  • Conformational entropy, a measure of fast internal dynamics, plays a critical role in regulating protein-ligand interactions.
  • Slow internal dynamics, involving energetically excited conformational states, also contribute to binding regulation.
  • Protein binding activity cannot be fully predicted from ground-state structures alone; internal dynamics are crucial regulators.