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Related Experiment Videos

Native protein sequences are designed to destabilize folding intermediates.

Yasuhiro Isogai1

  • 1Biometal Science Laboratory, RIKEN Harima Institute, Mikazuki, Sayo, Hyogo 679-5148, Japan. yisogai@riken.jp

Biochemistry
|February 24, 2006
PubMed
Summary

Altering hydrophobic residues in sperm whale apomyoglobin affects protein folding stability. Specific arrangements in natural proteins may destabilize folding intermediates, favoring efficient functional protein production.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Folding Dynamics

Background:

  • The hydrophobic core of proteins plays a crucial role in their stability and folding.
  • Understanding amino acid sequence determinants is key to predicting and controlling protein folding.
  • Sperm whale apomyoglobin serves as a model system for studying protein folding mechanisms.

Purpose of the Study:

  • To investigate how specific amino acid substitutions in the hydrophobic core of apomyoglobin impact its folding properties.
  • To determine the role of hydrophobic residue composition versus their specific arrangement in protein stability.
  • To elucidate the evolutionary pressures shaping the hydrophobic core of globular proteins.

Main Methods:

  • Construction of site-directed mutants of sperm whale apomyoglobin with altered hydrophobic residues (Ile, Val, Leu).

Related Experiment Videos

  • Thermodynamic analysis to assess the stability of folded states and folding intermediates relative to unfolded states.
  • Random mutagenesis of hydrophobic residues to study the effect of residue arrangement.

    • Main Results:

    • Replacing hydrophobic residues decreased thermodynamic stability of folded states but increased stability of folding intermediates.
    • Mutants with randomized hydrophobic residues (similar composition to wild-type) stabilized both intermediate and folded states.
    • The native arrangement of hydrophobic residues appears optimized to destabilize the folding intermediate.

    Conclusions:

    • Hydrophobic core composition and arrangement significantly influence protein folding stability and cooperativity.
    • Natural protein evolution may favor arrangements that transiently destabilize intermediates for efficient functional protein production.
    • The findings provide insights into the molecular evolution of globular proteins and their folding pathways.