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Related Concept Videos

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
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...
Amyloid Fibrils03:03

Amyloid Fibrils

Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
Amyloid deposits were observed as early as 1639 in the liver and the spleen.   In 1854, Rudolph Virchow performed iodine staining, normally used to...

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OaAEP1-Mediated Enzymatic Synthesis and Immobilization of Polymerized Protein for Single-Molecule Force Spectroscopy
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OaAEP1-Mediated Enzymatic Synthesis and Immobilization of Polymerized Protein for Single-Molecule Force Spectroscopy

Published on: February 5, 2020

Protein folding forces.

Bengt Nölting1, Neema Salimi, Ulrich Guth

  • 1Department of Biochemistry and Biophysics, University of California, San Francisco, 600 16th Street, San Francisco CA 94158-2517, USA. nolting@msg.ucsf.edu

Journal of Theoretical Biology
|January 8, 2008
PubMed
Summary
This summary is machine-generated.

Protein folding forces are non-uniformly distributed, with key interactions in secondary structures driving nucleation. This study analyzes 15 proteins to reveal specific folding mechanisms like helix compaction and strand movement.

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Microfluidic Mixers for Studying Protein Folding

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Area of Science:

  • Protein biophysics
  • Molecular dynamics
  • Structural biology

Background:

  • Protein folding is crucial for biological function.
  • Understanding folding forces at the residue level is complex.
  • Previous methods like Phi-value analysis have limitations in resolving folding motions.

Purpose of the Study:

  • To investigate average inter-residue folding forces using mutational data from 15 diverse proteins.
  • To determine the distribution and magnitude of residue-specific contributions to protein folding.
  • To elucidate the role of secondary structure formation in protein folding nucleation and early folding events.

Main Methods:

  • Analysis of mutational data from 15 different proteins.
  • Calculation of average inter-residue folding forces.
  • Correlation of energy changes with inter-residue contact maps.
  • Comparison with traditional Phi-value analysis.

Main Results:

  • Residue-specific folding forces are non-uniformly distributed, averaging around 1 piconewton (pN) per interaction.
  • Strongest folding forces are often located in helices and strands within folding nuclei, suggesting secondary structure involvement in nucleation.
  • Mutational data correlated with contact maps offer higher resolution than positional analysis alone.
  • Two distinct early folding mechanisms were identified: alpha-helix compaction and lateral strand movement.

Conclusions:

  • Protein folding nucleation is partially directed by the formation of secondary structure interactions.
  • Early folding events involve either alpha-helix compaction or lateral movement of adjacent strands.
  • The study provides a higher-resolution view of protein folding dynamics and mechanisms.