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Related Experiment Videos

Conservation of closed loops.

Boon K Yew1, Sree V Chintapalli, Graham G C Upton

  • 1Department of Biological Sciences, University of Essex, Wivenhoe Park, Colchester, CO4 3SQ, United Kingdom.

Journal of Molecular Graphics & Modelling
|April 27, 2007
PubMed
Summary
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The Berezovsky and Trifonov hypothesis suggests protein folding involves loop closures. Analysis of nine superfolds supports this, finding conserved loop ends around 25 residues, consistent with their model.

Area of Science:

  • Protein folding mechanisms
  • Structural biology
  • Bioinformatics

Background:

  • The closed loop hypothesis proposes that protein folding is driven by the formation of loops of specific lengths (25-35 residues) via hydrophobic interactions.
  • Previous studies have provided support for this hypothesis through analyses of major protein superfolds.

Purpose of the Study:

  • To investigate the conservation patterns at the ends of loops in nine major protein superfolds.
  • To evaluate the consistency of these patterns with the Berezovsky and Trifonov closed loop hypothesis.

Main Methods:

  • Generated multiple sequence alignments for nine superfolds (PDB codes: lthb, 1ilb, 256b, 2rhe, 1aps, 2stv, 4fxn (2fox), lubq, 7tim).
  • Analyzed the degree of sequence conservation at the loop ends within these alignments.

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Main Results:

  • Identified that 70% of the analyzed loop ends are well conserved across the superfolds.
  • Observed a peak distribution of approximately 25 residues for the distances between these conserved loop regions.

Conclusions:

  • The findings of high conservation at loop ends and the characteristic distance of ~25 residues strongly support the Berezovsky and Trifonov closed loop hypothesis.
  • The study reinforces the role of specific loop structures and hydrophobic interactions in the fundamental process of protein folding.