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Related Experiment Videos

Structural characterization of a highly-ordered 'molten globule' at low pH

C Redfield1, R A Smith, C M Dobson

  • 1Oxford Centre for Molecular Sciences, University of Oxford, UK.

Nature Structural Biology
|January 1, 1994
PubMed
Summary

Researchers studied protein unfolding using nuclear magnetic resonance. They found that interleukin-4 retains an ordered core, suggesting a

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Area of Science:

  • Protein folding and stability
  • Biophysics
  • Structural biology

Background:

  • Protein unfolding is crucial for understanding protein stability and design.
  • Interleukin-4 (a four helix bundle protein) unfolds at low pH.

Purpose of the Study:

  • To characterize the structural states of interleukin-4 after low pH-induced unfolding.
  • To investigate the nature of the hydrophobic core and secondary structure preservation in unfolded states.

Main Methods:

  • Heteronuclear nuclear magnetic resonance (NMR) spectroscopy was employed.
  • Analysis focused on structural integrity and secondary structure elements.

Main Results:

  • The unfolded interleukin-4 retains a highly ordered hydrophobic core.
  • Most secondary structure elements are preserved within the core.
  • Disorder is prominent in the polypeptide regions linking the core elements.

Conclusions:

  • The observed state is termed a 'highly ordered molten globule'.
  • This state may represent late-stage intermediates in protein folding.
  • It contrasts with more disordered molten globules associated with early folding intermediates.

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