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Protein Folding01:22

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Protein Folding01:25

Protein Folding

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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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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Molecular Chaperones and Protein Folding03:00

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Spontaneous conformational changes in the E. coli GroEL subunit from all-atom molecular dynamics simulations.

Yelena Sliozberg1, Cameron F Abrams

  • 1Department of Chemical and Biological Engineering, Drexel University, Philadelphia, PA, USA.

Biophysical Journal
|May 22, 2007
PubMed
Summary

The Escherichia coli GroEL chaperonin undergoes structural changes upon ATP binding, transitioning from a low-affinity to a high-affinity state. Molecular dynamics simulations reveal how these transitions, facilitated by natural vibrations, enable protein folding.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Structural Biology

Background:

  • Escherichia coli GroEL is a chaperonin composed of identical subunits forming two heptameric rings.
  • GroEL exhibits cooperativity in adenosine trisphosphate (ATP) binding and facilitates protein folding.
  • Understanding GroEL's structural transitions is key to its function in protein homeostasis.

Purpose of the Study:

  • To investigate the structural transitions of the GroEL subunit protein using molecular dynamics simulations.
  • To elucidate the mechanism of ATP binding cooperativity and its role in protein folding.

Main Methods:

  • Unbiased molecular dynamics simulations of the GroEL subunit in explicit water.
  • Simulations were performed with and without the nucleotide KMgATP.
  • Analysis of structural changes, domain movements, and inter-subunit interactions.

Main Results:

  • KMgATP binding induces a transition from a low-affinity (t) state to a high-affinity (r) state.
  • This transition involves a large-scale rotation of helix M, closing the ATP binding pocket.
  • The t-to-r transition requires breaking inter-subunit salt bridges and is facilitated by natural vibrations.

Conclusions:

  • Molecular dynamics simulations provide detailed insights into GroEL's functional conformational changes.
  • A novel mechanism for inter-ring cooperativity in ATP binding is proposed.
  • These findings enhance our understanding of chaperonin-assisted protein folding.