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Mutations in Antibody Fragments Modulate Allosteric Response Via Hydrogen-Bond Network Fluctuations.

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Researchers used mechanical clamping to identify allosteric sites in antibody fragments, revealing how mutations impact protein flexibility and rigidity through hydrogen-bond networks.

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Area of Science:

  • Protein dynamics and allostery
  • Computational biophysics
  • Antibody engineering

Background:

  • Allosteric sites are crucial for protein function and drug development.
  • Understanding protein conformational changes is key to identifying these sites.
  • Antibody fragments offer a tractable system for studying allosteric mechanisms.

Purpose of the Study:

  • To develop and apply a mechanical perturbation method for identifying allosteric sites in antibody fragments.
  • To investigate the impact of local perturbations on long-range protein dynamics.
  • To explore how mutations affect allosteric responses via hydrogen-bond network modulation.

Main Methods:

  • A novel mechanical perturbation method using distance constraints to mimic binding.
  • Integration of mechanical and thermodynamic viewpoints in a constraint model.
  • Molecular dynamics simulations of six single chain-Fv fragments.
  • Analysis of protein rigidity and flexibility changes using response maps.

Main Results:

  • The method successfully identified putative allosteric sites by locally restricting conformational entropy.
  • Long-range increases in protein rigidity and flexibility were frequently observed.
  • Allosteric responses were modulated by fluctuations in the hydrogen-bond network.
  • Mutations altered allosteric responses by shifting the population of hydrogen-bond networks.

Conclusions:

  • Mechanical perturbation is a viable strategy for allosteric site identification.
  • Protein dynamics are sensitive to local perturbations, with significant long-range effects.
  • Hydrogen-bond network dynamics play a critical role in mediating allosteric mechanisms and their modulation by mutations.