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Pathway of protein folding.

A R Fersht1, A Matouschek, J Sancho

  • 1Cambridge Centre for Protein Engineering, University Chemical Laboratory, UK.

Faraday Discussions
|January 1, 1992
PubMed
Summary

Protein folding initiates with the formation of beta-sheet and alpha-helix structures. These substructures then assemble via hydrophobic interactions to create the barnase protein

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Area of Science:

  • Biochemistry and Molecular Biology
  • Protein Folding Dynamics
  • Structural Biology

Background:

  • Understanding the precise sequence of events in protein folding is crucial for deciphering biological function.
  • Barnase, a bacterial ribonuclease, serves as a model system for studying protein folding pathways.
  • Previous studies have suggested various models for barnase folding, but the exact order of substructure formation remained unclear.

Purpose of the Study:

  • To elucidate the specific order of substructure formation during barnase folding.
  • To experimentally validate and refine existing models of barnase protein folding.
  • To investigate the role of local and long-range hydrophobic interactions in driving protein folding.

Main Methods:

  • Utilized a protein engineering approach to systematically alter and probe barnase structure.
  • Employed Nuclear Magnetic Resonance (NMR) spectroscopy to monitor folding intermediates and structural dynamics.
  • Conducted structural studies on isolated barnase fragments in solution.

Main Results:

  • Determined that early folding events involve the formation of the beta-sheet center and the C-terminus of the major alpha-helix.
  • Observed that these early substructures subsequently dock to establish the major hydrophobic core.
  • NMR data confirmed significant helical structure formation in isolated alpha-helix spanning peptides, indicating early secondary structure stabilization.
  • Demonstrated substantial hydrophobic surface burial accompanying native secondary structure formation.

Conclusions:

  • Protein folding is initiated by local hydrophobic interactions driving the formation of secondary structure elements.
  • The assembly of these secondary structures through further hydrophobic interactions leads to the formation of tertiary structure.
  • The findings support a hierarchical model of barnase folding, emphasizing the critical role of hydrophobic interactions at multiple stages.

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