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Related Experiment Videos

Microsecond protein folding kinetics from native-state hydrogen exchange

C B Arrington1, A D Robertson

  • 1Department of Biochemistry, University of Iowa, Iowa City, Iowa 52242, USA.

Biochemistry
|July 22, 1997
PubMed
Summary
This summary is machine-generated.

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Native-state amide proton exchange in turkey ovomucoid third domain (OMTKY3) reveals distinct unfolding and folding rates. Folding rates correlate with free energy, while unfolding rates do not, offering insights into protein dynamics.

Area of Science:

  • Protein dynamics and conformational analysis
  • Biophysical chemistry
  • Structural biology

Background:

  • Native-state amide proton (NH) exchange is a powerful tool for studying protein dynamics.
  • Turkey ovomucoid third domain (OMTKY3) is a well-characterized model protein for such studies.
  • Previous work identified NHs with anomalous exchange rates suggesting complex unfolding mechanisms.

Purpose of the Study:

  • To determine the rates of unfolding and folding for specific residues in OMTKY3.
  • To investigate the relationship between exchange rates, unfolding/folding rates, and free energy of unfolding.
  • To elucidate the mechanism of NH exchange under varying pH conditions.

Main Methods:

  • Monitoring NH exchange rates across a pH range to transition between EX2 and EX1 exchange regimes.

Related Experiment Videos

  • Applying a two-state model to fit pH-dependent exchange data and derive unfolding and folding rates.
  • Analyzing the correlation between unfolding/folding rates and residue-specific free energies of unfolding.

    • Main Results:

    • Unfolding rates for the 13 slowest exchanging NHs ranged from 0.003 to >/= 0.03 s-1.
    • No significant correlation was found between unfolding rates and free energies of unfolding.
    • Folding rates exhibited a strong positive correlation (R2 = 0.90) with free energies, with faster folding at sites of higher free energy.
    • Distinct folding rate patterns were observed across different secondary structure elements.

    Conclusions:

    • Native-state NH exchange provides precise measurements of rapid protein conformational fluctuations.
    • Folding rates are strongly influenced by local free energy, while unfolding rates are less directly correlated.
    • The study highlights the utility of NH exchange in dissecting protein dynamics and stability.