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Related Experiment Videos

Chaperonin-mediated protein folding.

D Thirumalai1, G H Lorimer

  • 1Center for Biomolecular Structure and Organization, Department of Chemistry and Biochemistry, University of Maryland, Collge Park, Maryland 20742, dt5@umail.umd.edu

Annual Review of Biophysics and Biomolecular Structure
|May 8, 2001
PubMed
Summary
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The GroEL-GroES molecular chaperone system actively unfolds misfolded proteins using mechanical force, promoting correct folding. This process involves ATP hydrolysis and allosteric transitions, influencing protein folding rates and dynamics.

Area of Science:

  • Molecular Biology
  • Biophysics
  • Protein Folding

Background:

  • Molecular chaperones, like the GroEL-GroES system in Escherichia coli, are essential for assisting protein folding.
  • Misfolded proteins can adopt non-native conformations, necessitating chaperone intervention.

Purpose of the Study:

  • To present a conceptual framework for understanding how the GroEL-GroES system facilitates the refolding of misfolded substrate proteins (SP).
  • To elucidate the mechanism by which GroEL-GroES actively participates in protein folding.

Main Methods:

  • Development of a conceptual model based on the GroEL-GroES structure and function.
  • Analysis of the proposed mechanism involving ATP hydrolysis, GroES binding, and allosteric transitions.
  • Integration of concepts from protein folding energy landscapes and kinetic partitioning.

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Main Results:

  • GroEL-GroES actively unfolds misfolded substrate proteins through force transmission during allosteric transitions.
  • Force-induced unfolding repositions the substrate protein on the energy landscape, enabling a higher probability of reaching the native state.
  • The model demonstrates a coupling between the timescales of GroEL-GroES allosteric transitions and substrate protein folding rates.

Conclusions:

  • The GroEL-GroES chaperonin-assisted folding mechanism involves cycles of active unfolding and refolding.
  • The interplay between chaperonin cycle dynamics and substrate protein folding kinetics determines various folding scenarios.
  • Further research, informed by single-molecule experiments, is needed to refine the understanding of chaperonin cycle dynamics.