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Related Concept Videos

Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
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Analyzing Protein Architectures and Protein-Ligand Complexes by Integrative Structural Mass Spectrometry
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Protein unfolding with a steric trap.

Tracy M Blois1, Heedeok Hong, Tae H Kim

  • 1Department of Chemistry and Biochemistry, UCLA-DOE Institute for Genomics and Proteomics, University of California, Los Angeles, California 90095, USA.

Journal of the American Chemical Society
|September 11, 2009
PubMed
Summary
This summary is machine-generated.

This study introduces steric trapping, a new method to study protein folding and stability under native conditions. This technique uses biotin tags and streptavidin to drive and monitor protein unfolding without altering solvent conditions.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Dynamics

Background:

  • Protein folding is crucial for biological function.
  • Current methods to study protein unfolding alter solution conditions, affecting molecular forces.
  • A method to induce and study unfolding in native solvent conditions is needed.

Purpose of the Study:

  • To introduce a novel method, steric trapping, for studying protein folding and stability.
  • To enable protein unfolding and analysis without destabilizing solvent conditions.
  • To investigate protein unfolding dynamics and stability in physiological environments.

Main Methods:

  • The steric trap method involves labeling a target protein with two spatially close biotin tags.
  • Streptavidin binding to both tags is contingent on protein unfolding.
  • Energetic coupling between streptavidin binding and protein unfolding drives the process.

Main Results:

  • The steric trap method successfully drives unfolding of dihydrofolate reductase (DHFR).
  • Apparent streptavidin binding affinity correlates with changes in DHFR stability.
  • DHFR can be locked in an unfolded state using streptavidin's slow off-rate.

Conclusions:

  • Steric trapping offers a novel approach to study protein folding and stability in native solvent conditions.
  • This method allows for the specific unfolding of selected protein domains.
  • The steric trap technique shows potential applicability to membrane proteins.