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Related Experiment Videos

Conformational switching in designed peptides: the helix/sheet transition

R Cerpa1, F E Cohen, I D Kuntz

  • 1Graduate Group in Biophysics, University of California, San Francisco 94143, USA.

Folding & Design
|January 1, 1996
PubMed
Summary

Peptide structure, including helical and beta sheet conformations, is influenced by solution conditions. A photoisomerizable peptide

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Biophysics

Background:

  • Peptide and protein structure depend on primary sequence and environmental factors.
  • Investigated the impact of solution conditions on peptide conformations.
  • Included a peptide with photoisomerizable p-phenylazo-L-phenylalanine.

Purpose of the Study:

  • To determine how solution conditions affect peptide folding.
  • To investigate conformational switching in peptides.
  • To analyze the photoisomerization effect on peptide structure.

Main Methods:

  • Spectroscopic studies (e.g., CD spectroscopy).
  • Analysis of peptide conformational changes.
  • Controlled variation of solution parameters (pH, NaCl, temperature, concentration).

Main Results:

  • Peptides exhibit conformational switching between helical and beta sheet states.
  • Solution conditions (pH, NaCl, temp, concentration) modulate this switching.
  • Photoisomerization of p-phenylazo-L-phenylalanine induces a switch from beta sheet to alpha helix.

Conclusions:

  • Hypothesized structural states: monomeric alpha helix and aggregated antiparallel beta sheet.
  • Aggregation-favoring conditions promote beta sheet formation.
  • Aggregation-inhibiting conditions favor alpha helix formation.
  • Solution-dependent conformational changes are relevant to protein design and biological processes.

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