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Related Concept Videos

Protein Folding01:25

Protein Folding

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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
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
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Protein Folding01:22

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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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Protein Organization01:13

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Protein Organization01:24

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Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
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Updated: Mar 10, 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 is a convergent problem!

Debarati Das Gupta1, Rahul Kaushik2, B Jayaram3

  • 1Department of Chemistry, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi 110016, India; Supercomputing Facility for Bioinformatics & Computational Biology, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi 110016, India.

Biochemical and Biophysical Research Communications
|December 17, 2016
PubMed
Summary
This summary is machine-generated.

Protein folding convergence is achieved when neighboring amino acids restrict backbone dihedral angles (phi and psi). This steric influence ensures proteins attain unique tertiary structures from their configurational volume.

Keywords:
Allowed regionsConfigurational volumeHigher order Ramachandran mapsProtein foldingTripeptide unit

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Area of Science:

  • * Computational biology and structural bioinformatics.
  • * Investigating protein structure and dynamics.

Background:

  • * Protein folding is a complex, NP-hard problem crucial for biological function.
  • * Understanding the forces driving protein structure convergence is a key challenge.
  • * Existing models like Ramachandran plots offer limited insights into higher-order correlations.

Purpose of the Study:

  • * To investigate the role of local steric effects in protein structure convergence.
  • * To determine when neighborhood influences on dihedral angles dictate final tertiary structure.
  • * To explore conformational restrictions beyond traditional Ramachandran analysis.

Main Methods:

  • * Analysis of steric correlations in approximately 43,612 protein structures.
  • * Examination of conformational preferences based on N- and C-terminal neighbors.
  • * Mapping of allowed phi (ϕ) and psi (ψ) backbone dihedral angles for amino acid residues.

Main Results:

  • * Higher-order steric correlations significantly impact allowed ϕ, ψ values.
  • * Conformational restrictions imposed by immediate neighbors are critical.
  • * Analysis revealed convergence is driven by local steric constraints, not just individual residue preferences.

Conclusions:

  • * Local steric interactions between adjacent amino acid residues are essential for protein folding.
  • * Considering tripeptide steric effects explains the convergence to unique tertiary structures.
  • * This finding provides a refined perspective on the physical principles governing protein folding.