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Protein-protein Interfaces02:04

Protein-protein Interfaces

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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
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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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Protein and Protein Structure02:15

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Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme...
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Updated: May 7, 2026

A Protocol for Computer-Based Protein Structure and Function Prediction
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A Protocol for Computer-Based Protein Structure and Function Prediction

Published on: November 3, 2011

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A simple atomic-level hydrophobicity scale reveals protein interfacial structure.

Lauren H Kapcha1, Peter J Rossky1

  • 1Department of Chemistry and Institute for Computational Engineering and Sciences, University of Texas at Austin, Austin, TX 78712-1167, USA.

Journal of Molecular Biology
|October 15, 2013
PubMed
Summary

A new atomic-level hydrophobicity scale accurately characterizes protein-water interactions, overcoming limitations of existing residue-based scales. This method provides a more reliable depiction of protein surface hydrophobicity.

Keywords:
IL-1βPDBPF4Protein Data BankSASAbiomolecule visualizationhydrationhydropathyinterleukin-1βmolecular recognitionplatelet factor 4protein bindingsolvent-accessible surface area

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Area of Science:

  • Biochemistry and Structural Biology
  • Computational Biology and Cheminformatics

Background:

  • Existing amino acid residue hydrophobicity scales show poor consistency and variable effectiveness in characterizing protein-water interactions.
  • Current scales treat hydrophobicity at the whole residue level, potentially missing finer details.

Purpose of the Study:

  • To introduce and validate a novel, simple, binary, atomic-level hydrophobicity scale.
  • To demonstrate the improved accuracy of atomic-level hydrophobicity in characterizing protein-water interactions compared to residue-based scales.

Main Methods:

  • Development of a binary, atomic-level hydrophobicity scale considering polar/non-polar moieties within residues and backbone atoms.
  • Comparison of the new scale with existing residue-based scales using protein binding interfaces.
  • Application of the atomic-level scale to analyze hydration in specific protein pockets and pores.

Main Results:

  • The atomic-level scale successfully captures anticipated hydrophobic character for residues consistent across existing scales.
  • Discrepancies were observed between residue-based and atomic-level descriptions for certain residues at protein interfaces.
  • The atomic-level scale accurately classifies hydrophobicity in functionally critical regions where residue-based scales falter.
  • The scale effectively rationalizes hydration patterns in hydrophobic pockets and identifies functional hydrophilic sites within hydrophobic pores.

Conclusions:

  • An atomic level of detail is essential for reliably depicting hydrophobicity across all protein surfaces.
  • The proposed atomic-level scale offers a simple yet powerful alternative to current residue-based methods for analyzing protein-water interactions.