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Related Experiment Videos

Rules for alpha-helix termination by glycine

R Aurora1, R Srinivasan, G D Rose

  • 1Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, MO 63110.

Science (New York, N.Y.)
|May 20, 1994
PubMed
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Researchers identified two glycine motifs that predict protein folding by capping alpha helix termini. These specific patterns of polar and apolar residues distinguish helix-capping glycines from internal ones.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Protein Folding

Background:

  • Alpha helices are fundamental protein structures.
  • Glycine residues play unique roles in protein structure.
  • Predicting protein folding remains a significant challenge.

Purpose of the Study:

  • To present a predictive rule for protein folding.
  • To identify specific glycine-based motifs involved in alpha helix termination.
  • To elucidate the structural characteristics of these motifs.

Main Methods:

  • Analysis of known protein helical sequences.
  • Identification of glycine residues at carboxyl termini.
  • Characterization of residue patterns (polar and apolar) within identified motifs.

Related Experiment Videos

  • Visual inspection and comparison of helical sequences.

    • Main Results:

    • Two distinct glycine-based motifs were identified capping alpha helix carboxyl termini.
    • Helices terminating in glycine predominantly featured one of these two motifs.
    • These motifs exhibit characteristic patterns of polar and apolar residues.
    • Distinguishing these motifs from internal glycines was possible through visual inspection.

    Conclusions:

    • These glycine motifs represent a stereochemical rule for protein folding.
    • Local sequence context dictates the selection of specific structural motifs.
    • The findings offer insights into the predictability of protein structure.