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Four helix bundle diversity in globular proteins

N L Harris1, S R Presnell, F E Cohen

  • 1Department of Pharmaceutical Chemistry, University of California, San Francisco 94143-0446.

Journal of Molecular Biology
|March 11, 1994
PubMed
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This study defines four helix bundles using geometric and solvent accessibility criteria, revealing non-random helix interactions. This work advances protein structure prediction and understanding of all-helical proteins.

Area of Science:

  • Structural biology
  • Computational biology
  • Protein folding

Background:

  • Four helix bundles are prevalent structural motifs in globular proteins.
  • Prior computational studies imposed arbitrary constraints on interhelical packing angles.

Purpose of the Study:

  • Develop a geometric definition for four helix bundles without arbitrary constraints.
  • Categorize four helix bundles and analyze helix-helix interactions.
  • Improve tertiary structure prediction for all-helical proteins.

Main Methods:

  • Analyzed 221 globular proteins with known structures.
  • Developed a geometric definition incorporating solvent accessibility.
  • Classified bundles based on interhelical angles and studied helix-helix interactions.

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Main Results:

  • Presented a taxonomy of four helix bundles based on observed interhelical angles.
  • Identified non-random distributions in central residues, contact normals, and skew angles.
  • Developed a geometric model for helix-helix interfaces.

Conclusions:

  • The new definition and taxonomy aid structural studies of alpha-helical proteins.
  • Including skew angles in models enhances prediction accuracy for all-helical protein tertiary structures.
  • Geometric properties offer insights into membrane-spanning protein organization.