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Related Experiment Videos

Protein folding triggered by electron transfer

T Pascher1, J P Chesick, J R Winkler

  • 1Beckman Institute, California Institute of Technology, Pasadena, 91125, USA.

Science (New York, N.Y.)
|March 15, 1996
PubMed
Summary

Researchers used electron transfer to study protein folding dynamics of ferricytochrome c. They observed two distinct folding phases, revealing insights into the protein

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Area of Science:

  • Biochemistry
  • Physical Chemistry
  • Protein Dynamics

Background:

  • Protein folding is crucial for biological function.
  • Understanding protein folding kinetics is a key challenge in biochemistry.
  • Ferricytochrome c is a model protein for studying folding mechanisms.

Purpose of the Study:

  • To investigate the folding kinetics of ferricytochrome c using photochemical electron injection.
  • To characterize the intermediate states and transition pathways during protein folding.
  • To explore the utility of electron-transfer methods in bridging the time scale gap in protein folding studies.

Main Methods:

  • Rapid photochemical electron injection into unfolded ferricytochrome c.
  • Titration with varying concentrations of guanidine hydrochloride (GuHCL) to induce unfolding.
  • Kinetic measurements at pH 7 and 40°C to observe folding phases.
  • Analysis of folding rates and activation free energy.

Main Results:

  • Two distinct protein folding phases were observed: a fast phase (40 microseconds) and a slow phase (90 ± 20 per second).
  • The activation free energy for the slow folding step showed a linear dependence on GuHCL concentration.
  • The folding rate constant extrapolated to aqueous solution was determined to be 7600 per second.

Conclusions:

  • Electron-transfer methods provide a powerful approach to study protein folding dynamics across nanosecond to millisecond timescales.
  • Guanidine hydrochloride concentration significantly influences the kinetics of ferricytochrome c folding.
  • The study elucidates key steps and energetics involved in the refolding of ferricytochrome c.

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