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Related Concept Videos

Protein Folding01:22

Protein Folding

Overview
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.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
Protein Folding01:22

Protein Folding

Overview
Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

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.
The...
Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

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.
The...
Bacterial Protein Maturation01:26

Bacterial Protein Maturation

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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Related Experiment Video

Updated: May 28, 2026

Thermodynamics of Membrane Protein Folding Measured by Fluorescence Spectroscopy
10:09

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Published on: April 28, 2011

Determinants of Protein Folding Pathways: Lessons from Metamorphic Proteins.

Valeria Pennacchietti1, Mariana Di Felice1, Julian Toso1

  • 1Laboratory Affiliated to Istituto Pasteur Italia, Fondazione Cenci Bolognetti, Dipartimento di Scienze Biochimiche "A. Rossi Fanelli", Sapienza Università di Roma, 00185 Rome, Italy.

International Journal of Molecular Sciences
|May 27, 2026
PubMed
Summary

Protein folding mechanisms are determined early, encoded in the denatured state. This review proposes that the denatured protein ensemble dictates folding pathways and final structure, offering a unified view of protein folding.

Keywords:
kineticsmutagenesispathwaystopology

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Computational Biology

Background:

  • The protein folding problem involves predicting structure from sequence and understanding folding mechanisms.
  • Artificial intelligence has advanced structure prediction, but folding mechanisms remain elusive.
  • Early studies focused on two-state folding and conserved mechanisms within protein families.

Purpose of the Study:

  • To review the evolution of protein folding studies.
  • To propose a unified view of protein folding mechanisms.
  • To highlight the role of the denatured state in determining folding pathways and topology.

Main Methods:

  • Review of existing literature on protein folding.
  • Analysis of studies on metamorphic proteins.
  • Synthesis of findings to propose a new theoretical framework.

Main Results:

  • Metamorphic proteins reveal diverse folding mechanisms from similar sequences.
  • Folding pathways are determined at very early stages.
  • The denatured ensemble contains biases dictating folding outcomes.

Conclusions:

  • Folding mechanisms are selected early in the folding process.
  • The denatured state plays a crucial role in defining both folding pathways and the final protein topology.
  • A unified view emphasizes the denatured ensemble's central role in protein folding.