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Compact intermediate states in protein folding

A L Fink1

  • 1Department of Chemistry and Biochemistry, University of California, Santa Cruz 95064, USA.

Annual Review of Biophysics and Biomolecular Structure
|January 1, 1995
PubMed
Summary
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All proteins form partially folded compact intermediates with secondary structure and exposed hydrophobic surfaces. These diverse species, varying in compactness, can model transient states during protein folding.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Protein Folding Dynamics

Background:

  • Partially folded protein intermediates are increasingly observed in various folding pathways.
  • Understanding these species is crucial for comprehending protein structure formation and function.

Purpose of the Study:

  • To characterize the properties of stable and transient partially folded protein intermediates.
  • To establish compact intermediates as models for transient states in protein folding.

Main Methods:

  • Comparative analysis of structural and biophysical properties of protein intermediates.
  • Utilizing hydrophobic dye binding and heat capacity measurements.
  • Investigating a range of conformations from expanded to near-native states.

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Main Results:

  • All proteins likely form compact intermediates under appropriate conditions.
  • These intermediates exhibit significant secondary structure, minimal tertiary structure, and exposed hydrophobic surfaces.
  • Compact intermediates display a broad spectrum of conformations and properties, varying between proteins and conditions.

Conclusions:

  • Compact intermediates are a general feature of protein folding.
  • Their diverse conformations and properties make them valuable models for transient folding intermediates.
  • Further study of these species will enhance our understanding of protein folding mechanisms.