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Using an azobenzene cross-linker to either increase or decrease peptide helix content upon trans-to-cis

Daniel G Flint1, Janet R Kumita, Oliver S Smart

  • 1School of Biosciences, University of Birmingham, Edgbaston, United Kingdom.

Chemistry & Biology
|April 3, 2002
PubMed
Summary
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Researchers developed reversible photocontrol for peptide and protein structures using azobenzene cross-linkers. This method allows precise manipulation of helix content, expanding possibilities for studying biological functions.

Area of Science:

  • Biochemistry
  • Biophysics
  • Molecular Biology

Background:

  • Controlling peptide and protein conformation is crucial for understanding biological functions.
  • Light-induced molecular switches offer precise temporal and spatial control over biomolecular structures.

Purpose of the Study:

  • To investigate the reversible photocontrol of peptide helix content using azobenzene cross-linkers.
  • To explore how the position of the azobenzene cross-linker affects conformational changes.

Main Methods:

  • Synthesis of short peptides with azobenzene cross-linkers between cysteine residues at specific positions (i, i+4 and i, i+11).
  • Utilizing trans-to-cis photoisomerization of the azobenzene moiety to induce conformational changes.
  • Spectroscopic analysis to quantify changes in helix content.

Related Experiment Videos

Main Results:

  • Reversible photoswitching of helix content was achieved in peptides containing azobenzene cross-linkers.
  • Azobenzene cross-linkers at the i, i+4 position increased helix content upon trans-to-cis isomerization.
  • Azobenzene cross-linkers at the i, i+11 position decreased helix content upon trans-to-cis isomerization.

Conclusions:

  • The study demonstrates effective photocontrol of peptide secondary structure (helix content) via azobenzene cross-linking.
  • Strategic placement of azobenzene cross-linkers allows for distinct conformational responses to light.
  • These findings provide novel tools for photocontrollable peptide and protein engineering for biological applications.