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Related Concept Videos

Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

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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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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.
Protein Structure Is Critical to Its Biological Function
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Bacterial Protein Maturation01:26

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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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Protein Folding Quality Check in the RER01:29

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ER is the primary site for the maturation and folding of soluble and transmembrane secretory proteins. The calnexin cycle is a specific chaperone system that folds and assesses the confirmation of N-glycosylated proteins before they can exit the ER lumen. The primary players of this quality check pipeline are the lectins, ER-resident chaperones, and a glucosyl transferase enzyme. In case the calnexin system in the lumen fails to salvage a misfolded protein, it is transported to the cytoplasm...
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Coupled Assays for Monitoring Protein Refolding in Saccharomyces cerevisiae
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Catalyzing Protein Folding by Chaperones.

Zijue Huang1, Scott Horowitz2,3

  • 1Department of Biochemistry, University of Colorado Boulder, Boulder, CO 80309, USA.

Biology
|October 29, 2025
PubMed
Summary
This summary is machine-generated.

Protein folding is vital for cell health but prone to errors causing disease. This review examines molecular chaperones and other factors that help proteins fold correctly and prevent misfolding.

Keywords:
RNAchaperoneisomeraseprotein foldingquadruplex

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Protein folding is crucial for cellular function and health.
  • Misfolded proteins can lead to various diseases.
  • The cellular proteostasis network maintains protein homeostasis.

Purpose of the Study:

  • To review the roles of different factors in protein folding within the cell.
  • To explore the mechanisms of the proteostasis network, including chaperones and prolyl isomerases.
  • To highlight current understanding and open questions in protein folding.

Main Methods:

  • Literature review of existing research on protein folding.
  • Analysis of the catalytic actions of prolyl isomerases and molecular chaperones.
  • Integration of structural and biochemical insights.

Main Results:

  • Molecular chaperones and prolyl isomerases are key players in guiding protein folding.
  • RNA G-quadruplexes are also implicated as factors influencing protein folding.
  • These components work collaboratively to ensure correct protein structures and prevent aggregation.

Conclusions:

  • Understanding protein folding mechanisms is essential for combating diseases caused by misfolding.
  • Further research is needed to fully elucidate how chaperones optimize protein folding rates.
  • The proteostasis network is a complex system critical for cellular health.