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Protein Folding01:25

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Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
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Mapping Protein Structural Evolution upon Unfolding.

Veena Shankar Avadhani1, Supratim Mondal1, Shibdas Banerjee1

  • 1Department of Chemistry, Indian Institute of Science Education and Research Tirupati, Tirupati 517507, India.

Biochemistry
|January 27, 2022
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Summary
This summary is machine-generated.

Researchers developed a new method to capture and analyze protein folding intermediates. This technique revealed that common proteins exhibit multiple stable conformations at physiological pH, challenging previous assumptions about protein dynamics.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Analytical Chemistry

Background:

  • Protein folding and unfolding are complex processes.
  • Intermediate conformers are often transient and difficult to study.
  • Previous methods have underestimated or failed to capture these intermediates.

Purpose of the Study:

  • To develop a method for kinetically trapping, resolving, and quantifying protein conformers during unfolding.
  • To investigate the conformational landscape of model proteins under varying pH conditions.

Main Methods:

  • Acid-induced unfolding of cytochrome c, myoglobin, and lysozyme.
  • Electrospray ionization coupled with high field asymmetric waveform ion mobility spectrometry (FAIMS).
  • Two-dimensional mapping of FAIMS data for conformer resolution and quantification.

Main Results:

  • Successfully trapped and quantified diverse, thermodynamically stable intermediate conformers.
  • Revealed that cytochrome c, myoglobin, and lysozyme are metamorphic, existing in multiple folded states at physiological pH.
  • Observed unusual "conformational shuttling" in cytochrome c prior to molten globule formation.

Conclusions:

  • The developed FAIMS approach provides a powerful tool for probing protein unfolding mechanisms.
  • Proteins exhibit greater conformational heterogeneity at physiological pH than previously thought.
  • This study challenges existing models of protein folding dynamics and stability.