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Hydrophilic framework in proteins?

J C Jésior1

  • 1TIMC Laboratory, Institut Albert Bonniot, Faculté de Médecine, La Tronche, France. jean-claude.jesior@imag.fr

Journal of Protein Chemistry
|August 17, 2000
PubMed
Summary

This study reveals that protein structures have a hydrophilic framework, challenging the traditional view of hydrophobic cores driving protein folding. Hydrophobic and hydrophilic residues are equally abundant and play similar roles.

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Area of Science:

  • Structural biology
  • Biophysics
  • Computational chemistry

Background:

  • The hydrophobic effect is a primary driver of protein folding.
  • Protein structures are often described as having hydrophobic cores.

Purpose of the Study:

  • To analyze the spatial neighborhood composition of amino acid residues.
  • To develop a novel hydrophobicity scale based on residue proximity.
  • To investigate the structural role of hydrophobic and hydrophilic residues.

Main Methods:

  • Analysis of 511 protein structures.
  • Focus on side-chain atom interactions.
  • Generation of a symmetrical hydrophobicity scale.
  • Categorization into seven functional groups.

Main Results:

  • Hydrophobic and hydrophilic residues are found in equal proportions.
  • Nearest neighbors of all residues are hydrophilic.
  • Hydrophilic residues form a distinct structural framework with peaks at 5.0, 6.5, and 8.0 A.
  • Hydrophobic residues aggregate at 3.9 A.

Conclusions:

  • The findings suggest a significant role for a hydrophilic structural framework.
  • This challenges the conventional emphasis on hydrophobic cores in protein folding.
  • Hydrophobic and hydrophilic residues exhibit equipartition and equivalent functional roles.

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