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Related Experiment Videos

Apparent two-state tendamistat folding is a sequential process along a defined route.

A Bachmann1, T Kiefhaber

  • 1Biozentrum der Universität Basel, Abteilung Biophysikalische Chemie, Klingelbergstr. 70, Basel, CH-4056, Switzerland.

Journal of Molecular Biology
|March 10, 2001
PubMed
Summary

Tendamistat folding, initially appearing as a two-state process, involves at least two steps via a key intermediate. This protein folding mechanism highlights the role of non-specific collapse and metastable states.

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Area of Science:

  • Protein folding dynamics
  • Biophysical chemistry
  • Structural biology

Background:

  • Tendamistat, a small all-beta-sheet protein, exhibits rapid folding and unfolding.
  • Apparent two-state kinetics suggest a simple folding mechanism.

Purpose of the Study:

  • To investigate the detailed folding mechanism of tendamistat.
  • To identify intermediate states and rate-limiting steps in tendamistat folding.
  • To elucidate the role of solvent conditions on folding pathways.

Main Methods:

  • Kinetic measurements of two tendamistat variants.
  • Analysis under various solvent conditions.
  • Determination of activation parameters.

Main Results:

Related Experiment Videos

  • Folding occurs in at least two sequential steps through a metastable intermediate.
  • Either step can be rate-limiting depending on solvent conditions.
  • The first step involves an enthalpic barrier, the second an entropic barrier at 25°C.

Conclusions:

  • Tendamistat folding proceeds via an initial non-specific collapse followed by secondary and tertiary structure formation.
  • Metastable intermediates are crucial in the mechanism of apparent two-state protein folding.
  • A distinct folding route for tendamistat involves obligatory intermediate states.