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Related Experiment Videos

On-pathway versus off-pathway folding intermediates

Baldwin1

  • 1Robert L Baldwin, Biochemistry Department, Beckman Center, Stanford University Medical Center, Stanford, CA 94305-5307, USA.

Folding & Design
|January 1, 1995
PubMed
Summary
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Molten globule intermediates in protein folding are debated as on-pathway or off-pathway. Recent experiments explore their role, stability, and implications for protein folding mechanisms.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Dynamics

Background:

  • Molten globule intermediates are transient structures observed during protein folding.
  • Their precise role in the protein folding pathway remains a subject of debate.

Purpose of the Study:

  • To review recent experimental evidence regarding the on-pathway or off-pathway nature of molten globule intermediates.
  • To discuss factors influencing the observation and stability of these intermediates.
  • To explore implications for understanding protein folding mechanisms.

Main Methods:

  • Analysis of kinetic data, including folding rates versus denaturant concentration.
  • Interpretation of experimental observations related to protein folding intermediates.
  • Review of studies on specific proteins like hen lysozyme.

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Main Results:

  • The presence of a 'rollover' in folding rate plots is discussed in relation to pathway determination.
  • Lack of observed intermediates may indicate lower stability rather than alternative mechanisms.
  • Recent findings on unfolding intermediates are considered.

Conclusions:

  • Experimental evidence is crucial for classifying molten globule intermediates.
  • Understanding these intermediates provides insights into the fundamental mechanisms of protein folding.
  • Further research is needed to fully elucidate their role and significance.