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Parallel protein-unfolding pathways revealed and mapped.

Caroline F Wright1, Kresten Lindorff-Larsen, Lucy G Randles

  • 1Department of Chemistry, University of Cambridge, MRC Centre for Protein Engineering, Lensfield Road, Cambridge CB2 1EW, UK.

Nature Structural Biology
|July 2, 2003
PubMed
Summary
This summary is machine-generated.

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This study provides experimental evidence for multiple protein folding pathways. Changes in flux between transition states reveal distinct pathway preferences under varying denaturant conditions.

Area of Science:

  • Biochemistry and Molecular Biology
  • Protein Dynamics
  • Chemical Kinetics

Background:

  • Theoretical models predict multiple protein folding pathways, but experimental validation is limited.
  • Understanding protein folding pathways is crucial for deciphering protein function and misfolding diseases.

Purpose of the Study:

  • To experimentally demonstrate the existence and flux between parallel protein folding pathways.
  • To investigate how denaturant concentration influences pathway selection in a beta-sandwich protein.
  • To map the structural characteristics of transition states on different folding pathways.

Main Methods:

  • Utilized denaturant-dependent unfolding kinetics to observe changes in folding pathway flux.
  • Employed systematic Phi-value analysis to map the structure of transition states.

Related Experiment Videos

  • Introduced point mutations to alter pathway accessibility and probe transition state properties.

    • Main Results:

    • Observed unprecedented upward curvature in unfolding kinetics, indicating shifts in pathway flux.
    • Demonstrated that increasing denaturant destabilizes compact transition states, favoring less structured ones.
    • Successfully mapped two distinct transition states on separate folding pathways using Phi-value analysis.
    • Found that the high-denaturant favored transition state is more polarized than the physiologically relevant one.

    Conclusions:

    • Provides robust experimental evidence for parallel protein folding pathways.
    • Highlights the role of denaturant concentration in modulating flux between pathways.
    • Suggests that pathway selection influences the structural properties of transition states, with implications for evolutionary selection against misfolding.