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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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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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Updated: Feb 22, 2026

Microfluidic Mixers for Studying Protein Folding
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Microfluidic Mixers for Studying Protein Folding

Published on: April 10, 2012

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Protein folding at extreme temperatures: Current issues.

Georges Feller1

  • 1Laboratory of Biochemistry, Center for Protein Engineering-InBioS, University of Liège, Institute of Chemistry B6a, 4000 Liège-Sart Tilman, Belgium.

Seminars in Cell & Developmental Biology
|September 25, 2017
PubMed
Summary
This summary is machine-generated.

Life exists in extreme temperatures, but protein folding rates are not adapted. Organisms use chaperones and molecular adaptations to ensure protein stability in cold and hot environments.

Keywords:
ExtremophilesProlyl isomerizationProtein foldingThermodynamic stabilityTrigger factor

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Area of Science:

  • Biochemistry
  • Extremophile Biology
  • Molecular Biology

Background:

  • Life thrives in temperatures from -25°C to 122°C.
  • Protein folding is immediately influenced by environmental temperature upon synthesis.
  • Protein folding rates are kinetically constrained and not adapted to extreme temperatures.

Purpose of the Study:

  • Investigate how organisms maintain protein function across diverse temperature ranges.
  • Understand the molecular mechanisms counteracting temperature-induced protein misfolding.
  • Explore adaptations in protein folding and stability in extremophiles.

Main Methods:

  • Analysis of protein folding kinetics at different temperatures.
  • Studying the role of chaperones (e.g., Trigger Factor) in regulating folding.
  • Examining molecular adaptations in cold-adapted (psychrophilic) proteins, including proline content and prolyl isomerase activity.
  • Differential scanning calorimetry to assess protein stability.

Main Results:

  • Protein folding is too fast at high temperatures and too slow in cold environments.
  • Chaperones slow down folding intermediates in hyperthermophiles.
  • Psychrophiles reduce proline content and increase prolyl isomerase activity to compensate for slow folding in the cold.
  • Extremophilic proteins, despite similar folds, exhibit significant differences in stability.

Conclusions:

  • Organisms employ specific strategies to ensure protein folding and stability in extreme environments.
  • Molecular adaptations, including chaperone use and changes in protein composition, are crucial for life in extreme temperatures.
  • Protein stability varies significantly among extremophilic proteins, highlighting diverse evolutionary solutions.