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Related Experiment Videos

Helix promotion in polypeptides by polyols

J Bello1

  • 1Department of Chemistry, Roswell Park Division of the Graduate School, State University of New York, Buffalo 14263.

Biopolymers
|March 1, 1993
PubMed
Summary

The study shows that glycerol and sucrose significantly increase helix formation in certain peptides, particularly [L-Lys(Me3)]n.ClO4 and melittin, depending on pH. These findings offer insights into peptide behavior in mixed solvents.

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Area of Science:

  • Biochemistry
  • Biophysical Chemistry
  • Polymer Science

Background:

  • Peptide secondary structure is influenced by solvent composition.
  • Understanding these effects is crucial for protein folding and biomaterial design.

Purpose of the Study:

  • To investigate the impact of glycerol and sucrose on the helical content of specific peptides.
  • To elucidate the mechanisms behind solvent-induced peptide conformational changes.

Main Methods:

  • Spectroscopic analysis, specifically circular dichroism (CD) at 222 nm, was used to measure helix content.
  • Experiments were conducted on [L-Lys(Me3)]n.ClO4, [L-Lys(Me3)50,L-Ala50]n.ClO4, melittin, and methylated melittin in aqueous solutions with varying concentrations of glycerol and sucrose.
  • Peptide behavior was studied across different pH levels (5.5 and 7.2).

Main Results:

  • Glycerol and sucrose markedly increased helix content in [L-Lys(Me3)]n.ClO4 and [L-Lys(Me3)50,L-Ala50]n.ClO4 in water.
  • A significant increase in ellipticity at 222 nm was observed for [L-Lys(Me3)]n.ClO4 in 50% glycerol, indicating substantial helix formation.
  • Glycerol promoted helix formation in melittin at both pH 7.2 and 5.5, while sucrose showed a similar effect only at pH 5.5. Glycerol also induced some helix in methylated melittin.

Conclusions:

  • The study demonstrates that kosmotropic agents like glycerol and sucrose can significantly stabilize peptide helical structures.
  • The observed effects are attributed to a combination of excluded volume effects, changes in the free energy of transfer for peptide and hydrophobic groups, electrostatic interactions, and preferential hydration.
  • These findings contribute to the understanding of peptide-solvent interactions and the factors governing protein secondary structure stability.

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