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Related Experiment Videos

Conservation of folding pathways in evolutionarily distant globin sequences.

C Nishimura1, S Prytulla, H J Dyson

  • 1Department of Molecular Biology and Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA.

Nature Structural Biology
|August 10, 2000
PubMed
Summary

Protein folding pathways can differ even for related proteins. This study found apoleghemoglobin folding differs from apomyoglobin, despite structural similarities, highlighting unique intermediate states in protein folding.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Protein Folding Dynamics

Background:

  • Evolutionarily related proteins with similar structures may exhibit similar folding pathways.
  • Understanding protein folding is crucial for comprehending biological function and disease.

Purpose of the Study:

  • To investigate the folding pathway of apoleghemoglobin.
  • To test the hypothesis that similar protein structures lead to similar folding pathways.

Main Methods:

  • Stopped-flow circular dichroism
  • Heteronuclear NMR pulse labeling
  • Mass spectrometry

Main Results:

  • Apoleghemoglobin's folding pathway significantly differs from apomyoglobin.

Related Experiment Videos

  • Both proteins fold via helical burst phase intermediates.
  • Apoleghemoglobin intermediates stabilize G, H, and part of E helices, while apomyoglobin stabilizes A, B, G, and H helices.

    • Conclusions:

    • Protein sequence, not just structure, dictates folding pathways.
    • Folding intermediates are distinct even in related proteins.
    • The helical burst phase is a common but not identical intermediate in protein folding.