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Related Experiment Videos

Disulfide bonds and protein folding.

W J Wedemeyer1, E Welker, M Narayan

  • 1Baker Laboratory of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853-1301, USA.

Biochemistry
|April 12, 2000
PubMed
Summary

Disulfide bond chemistry aids protein folding studies, revealing bovine pancreatic ribonuclease A (RNase A) folding is cooperative and avoids misfolded states. Engineered cross-links can probe protein folding transition states.

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Area of Science:

  • Biochemistry and Molecular Biology
  • Protein Chemistry
  • Structural Biology

Background:

  • Disulfide bonds play a crucial role in protein structure, stability, and function.
  • Understanding protein folding mechanisms is fundamental to molecular biology and disease research.
  • Bovine pancreatic ribonuclease A (RNase A) is a well-characterized model protein for folding studies.

Purpose of the Study:

  • To review and illustrate the applications of disulfide-bond chemistry in protein folding, structure, and stability studies.
  • To investigate the mechanism of reductive unfolding and oxidative folding of RNase A.
  • To probe structural fluctuations and the folding transition state using engineered cross-links.

Main Methods:

  • Utilized disulfide-bond chemistry to study protein folding pathways.
  • Employed reductive unfolding and oxidative folding experiments with RNase A.
  • Analyzed structural fluctuations and conformational order in folding intermediates.
  • Introduced engineered covalent cross-links to investigate the folding transition state.

Main Results:

  • Reductive unfolding of RNase A demonstrated the utility of disulfide bonds in probing structural fluctuations.
  • Oxidative folding studies revealed that disulfide-coupled folding is highly cooperative, with no partially folded species observed.
  • Misfolded disulfide species were not detected, challenging predictions from 'rugged funnel' protein folding models.
  • Engineered cross-links successfully assayed for protein segment association in the folding transition state.

Conclusions:

  • Disulfide-bond chemistry is a powerful tool for dissecting protein folding mechanisms.
  • RNase A folding is a cooperative process that efficiently avoids misfolded intermediates.
  • The study provides insights into the conformational folding mechanism and the utility of engineered cross-links.

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