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Related Experiment Videos

Microsecond protein folding through a compact transition state

R E Burton1, G S Huang, M A Daugherty

  • 1Department of Biochemistry, Duke University Medical Center, Durham, NC 27710, USA.

Journal of Molecular Biology
|October 25, 1996
PubMed
Summary
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Dynamic NMR methods reveal that a Glycine to Alanine mutation significantly alters protein folding pathways. This mutation dramatically enhances the folding rate and alters the transition state solvent accessibility of lambda repressor variants.

Area of Science:

  • Protein dynamics and biophysics
  • Molecular biology and biochemistry
  • Structural biology

Background:

  • Understanding protein folding mechanisms is crucial for deciphering biological functions.
  • Fast-folding proteins offer unique insights into the fundamental principles of protein dynamics.
  • Lambda repressor variants provide model systems for studying folding pathways.

Purpose of the Study:

  • To investigate the folding and unfolding kinetics of wild-type lambda 6-85 and a G46A/G48A variant using dynamic Nuclear Magnetic Resonance (NMR).
  • To elucidate the impact of specific mutations on protein folding pathways and transition state properties.
  • To determine the role of helix 3 stability in dictating the protein folding mechanism.

Main Methods:

  • Dynamic NMR spectroscopy was employed to measure protein folding and unfolding rate constants.

Related Experiment Videos

  • Urea-induced denaturation experiments were performed to analyze folding thermodynamics.
  • Analysis of linear ln(kf,u) versus [urea] plots to confirm two-state folding.
  • Calculation of transition state solvent accessibility using slopes of denaturation curves.

    • Main Results:

    • Lambda 6-85 refolds with a lifetime of approximately 250 microseconds.
    • The G46A/G48A variant exhibits significantly faster folding, with a lifetime under 20 microseconds.
    • The Glycine to Alanine double mutation drastically alters transition state solvent accessibility, reducing it from 0.61 to 0.16.
    • Both proteins demonstrate linear ln(kf,u) versus [urea] plots, consistent with two-state folding.

    Conclusions:

    • The G46A/G48A mutation induces a dramatic change in the protein folding pathway.
    • The intrinsic stability of helix 3 is a key determinant of the folding mechanism.
    • Dynamic NMR is a powerful tool for characterizing the kinetics and mechanisms of fast-folding proteins.