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Molecular Chaperones and Protein Folding03:00

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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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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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Bacterial protein maturation is a tightly regulated process that ensures newly synthesized polypeptides achieve correct functional conformations. This maturation involves a series of modifications, folding events, and quality control steps, often assisted by specialized chaperone proteins.N-Terminal ModificationsThe maturation of bacterial polypeptides begins cotranslationally as the polypeptide exits the ribosome. The first amino acid, N-formylmethionine (fMet), is typically modified at the...
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Defining Hsp33's Redox-regulated Chaperone Activity and Mapping Conformational Changes on Hsp33 Using Hydrogen-deuterium Exchange Mass Spectrometry
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How do chaperonins fold protein?

Fumihiro Motojima1

  • 1Department of Molecular Biosciences, Faculty of Life Sciences, Kyoto Sangyo University, Kamigamo-Motoyama, Kita-ku, Kyoto 603-8555, Japan.

Biophysics (Nagoya-Shi, Japan)
|August 6, 2016
PubMed
Summary

Chaperonins, crucial protein-folding assistants, do not fully encapsulate denatured proteins. Instead, proteins interact with chaperonin interfaces, partially extending outside the cage, challenging previous models.

Keywords:
GroELhydrophobic interactionmolecular chaperoneprotein folding

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Area of Science:

  • Molecular biology
  • Biochemistry
  • Structural biology

Background:

  • Protein folding is vital for cellular function.
  • Molecular chaperones, including chaperonins, assist protein folding.
  • The precise mechanism of chaperonin-mediated protein folding remains debated.

Purpose of the Study:

  • To review recent findings on chaperonin function.
  • To present a new model for chaperonin-assisted protein folding.

Main Methods:

  • The abstract does not specify methods, but implies experimental investigation and model development.

Main Results:

  • Denatured proteins interact with hydrophobic residues at chaperonin subunit interfaces.
  • Denatured proteins partially protrude from the chaperonin cage, contrary to full encapsulation assumptions.

Conclusions:

  • Chaperonins may accelerate protein folding through mechanisms involving partial exposure.
  • A revised model is proposed for chaperonin-mediated protein folding based on these findings.