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Protein Folding

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.
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Related Experiment Video

Updated: Jun 23, 2026

Transmembrane Domain Oligomerization Propensity determined by ToxR Assay

Transmembrane Domain Oligomerization Propensity determined by ToxR Assay

Published on: May 26, 2011

Structural features for homodimer folding mechanism.

Sajitha Lulu¹, Abishek Suresh, Velmurugan Karthikraja

¹School of Biotechnology, Chemical and Biomedical Engineering, VIT University, Vellore 632014, Tamil Nadu, India.

Journal of Molecular Graphics & Modelling

|May 16, 2009

Summary

Structural features distinguish homodimer folding mechanisms. Two-state (2S) homodimers have higher interface-to-total residue ratios and distinct amino acid compositions compared to three-state (3S) homodimers, aiding in mechanism differentiation.

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Last Updated: Jun 23, 2026

Transmembrane Domain Oligomerization Propensity determined by ToxR Assay

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Published on: May 26, 2011

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Published on: July 16, 2017

Area of Science:

Structural biology
Protein folding mechanisms
Bioinformatics

Background:

Homodimers play crucial roles in biological catalysis and regulation.
Understanding homodimer folding pathways, including two-state (2S) and three-state (3S) mechanisms, is essential for comprehending their function.
Three-state folding can proceed via monomer (3SMI) or dimer (3SDI) intermediates.

Purpose of the Study:

To differentiate between 2S, 3SMI, and 3SDI homodimers using distinct structural features.
To identify key structural parameters that correlate with different homodimer folding mechanisms.

Main Methods:

Analysis of a dataset of 25 2S, 10 3SMI, and 6 3SDI homodimer structures.
Calculation and comparison of structural parameters including interface-to-total residue ratio, interface residues, monomer length, interface area, and hydrophobicity factor.
Statistical analysis using Pearson's correlation coefficient to assess relationships between structural features.

Main Results:

The interface-to-total residue ratio is significantly larger in 2S homodimers compared to 3S homodimers.
Interface residues correlate with monomer size in 2S and 3SMI but not in 3SDI.
The mean hydrophobicity factor is lower in 3S homodimers than in 2S homodimers.
Amino acid composition differs, with 2S homodimers showing more hydrophilic residues and a different charge balance compared to 3S homodimers.

Conclusions:

Distinct structural features can effectively differentiate between 2S, 3SMI, and 3SDI homodimer folding mechanisms.
These findings provide valuable insights into the biophysical principles governing homodimer folding and binding.
The identified structural markers can aid in predicting folding pathways from protein structures.