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Glassy Dynamics and Memory Effects in an Intrinsically Disordered Protein Construct.

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Intrinsically disordered proteins exhibit glassy dynamics, including logarithmic relaxations and memory effects, under applied tension. This behavior arises from multiple local structures within the protein chain, a finding applicable to other disordered proteins.

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Area of Science:

  • Biophysics
  • Protein Dynamics
  • Soft Matter Physics

Background:

  • Globular proteins exhibit glassy, nonexponential relaxations attributed to conformational dynamics.
  • Intrinsically disordered proteins (IDPs) were thought to lack these characteristics.
  • Understanding IDP dynamics is crucial for their biological functions.

Purpose of the Study:

  • To investigate the presence of glassy dynamics in intrinsically disordered proteins.
  • To identify the underlying mechanisms responsible for these dynamics in IDPs.
  • To explore the implications of these findings for the broader class of disordered proteins.

Main Methods:

  • Single-molecule experiments applying controlled tension to a disordered protein construct.
  • Analysis of relaxation dynamics, specifically logarithmic relaxations and Kovacs memory effect.
  • Development and validation of a theoretical model predicting force-dependent relaxation.

Main Results:

  • Demonstrated two key signatures of glassy dynamics (logarithmic relaxations, Kovacs memory effect) in a single disordered protein molecule.
  • Identified the presence of multiple independent local structures within the disordered protein chain.
  • Developed a model that accurately predicts the force dependence of these relaxation dynamics.

Conclusions:

  • Intrinsically disordered proteins can exhibit glassy dynamics, challenging previous assumptions.
  • Multiple local structures within the protein chain are responsible for these observed dynamics.
  • The proposed mechanism is likely generalizable to other disordered proteins.