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Structures of folding intermediates

O B Ptitsyn1

  • 1Institute of Protein Research, Puschino, Russia.

Current Opinion in Structural Biology
|February 1, 1995
PubMed
Summary
This summary is machine-generated.

Recent studies reveal that the equilibrium molten globule, a protein-folding intermediate, possesses a native-like structure. This state is separated from the unfolded state by a distinct first-order phase transition, advancing our understanding of protein folding barriers.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biophysics

Background:

  • Protein folding is crucial for cellular function.
  • Understanding protein-folding intermediates is key to deciphering the folding process.
  • Previous research has identified various intermediates but lacked detailed structural and thermodynamic characterization.

Purpose of the Study:

  • To investigate the structural and thermodynamic properties of protein-folding intermediates.
  • To elucidate the nature of the equilibrium molten globule state.
  • To characterize the phase transition between unfolded and molten globule states.

Main Methods:

  • Utilized spectroscopic techniques (e.g., circular dichroism, fluorescence) to probe protein structure.
  • Employed thermodynamic methods (e.g., calorimetry) to analyze phase transitions.

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  • Investigated the presence and characteristics of novel equilibrium intermediates.

    • Main Results:

    • The equilibrium molten globule state exhibits a native-like tertiary fold.
    • A first-order phase transition separates the molten globule from the fully unfolded state.
    • New equilibrium intermediates were identified, providing a more complete picture of the folding landscape.

    Conclusions:

    • The molten globule represents a stable, structurally defined intermediate in protein folding.
    • The folding pathway involves distinct thermodynamic transitions, challenging previous models.
    • Significant progress has been made in understanding the energy landscape and barriers governing protein folding.