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Related Experiment Videos

Core mutations switch monomeric protein GB1 into an intertwined tetramer.

M Kirsten Frank1, Fred Dyda, Anatoliy Dobrodumov

  • 1Laboratories of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA.

Nature Structural Biology
|October 16, 2002
PubMed
Summary

Mutant streptococcal protein G (GB1) forms a stable tetramer through intermolecular strand exchange, demonstrating how point mutations can drastically alter protein structure and stability.

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Area of Science:

  • Protein structure and dynamics
  • Biochemistry
  • Structural biology

Background:

  • Streptococcal protein G (GB1) is a well-characterized immunoglobulin-binding domain.
  • Understanding protein structural changes is crucial for protein engineering and drug design.

Purpose of the Study:

  • To determine the structure of a mutant GB1 protein with five core residue changes.
  • To investigate the impact of these mutations on protein oligomerization and quaternary structure.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy
  • X-ray crystallography

Main Results:

  • The mutant GB1 protein forms a stable, symmetric tetramer.
  • The tetrameric structure involves intermolecular strand exchange among all four units.

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  • Four of the five secondary structure elements from the wild-type monomer are conserved, but with altered interactions.

    • Conclusions:

    • A moderate number of point mutations can induce significant alterations in protein structure and stability.
    • Multimerization can overcome reduced stability of individual protein units.
    • This mutant GB1 structure exemplifies protein conformational flexibility and adaptation.