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Related Experiment Videos

A protein sequence that can encode native structure by disfavoring alternate conformations.

W Christian Wigley1, Michael J Corboy, Todd D Cutler

  • 1Department of Physiology, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390-9040, USA.

Nature Structural Biology
|April 9, 2002
PubMed
Summary
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Protein sequences encode folding information not just by promoting correct structures, but also by preventing misfolding. This study reveals proline residues in transmembrane helices act as

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Folding Dynamics

Background:

  • Protein sequences contain information for 3D structure formation.
  • Native proteins fold into stable, kinetically accessible structures.
  • Misfolded structures can arise during protein folding.

Purpose of the Study:

  • To investigate a novel mechanism of protein folding.
  • To identify the role of proline residues in transmembrane helix folding.
  • To understand how protein sequences prevent misfolding.

Main Methods:

  • Analysis of a specific proline residue in the cystic fibrosis transmembrane conductance regulator (CFTR) third transmembrane helix.
  • Genome-wide analysis of transmembrane protein sequences.
  • Investigating the impact of proline on protein folding pathways.

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Main Results:

  • A proline residue in the CFTR transmembrane helix disfavors misfolded structure formation.
  • Genome-wide analyses support this mechanism's generality.
  • Proline residues are more frequent in transmembrane alpha-helices due to this role.

Conclusions:

  • Protein sequences utilize 'negative folding determinants' to prevent off-pathway structures.
  • This represents an additional mechanism for encoding folding information.
  • Proline residues play a crucial role in ensuring correct protein folding.