Controlling biological activity with light: diarylethene-containing cyclic peptidomimetics

Area of Science:

• Photochemistry
• Biochemistry
• Peptide Science

Background:

• Natural photobiological processes typically rely on external chromophores or modified amino acid side chains.
• Controlling peptide conformation and function using light offers precise spatiotemporal regulation.

Purpose of the Study:

• To engineer a system where the polypeptide backbone itself can be conformationally switched by light.
• To demonstrate light-inducible control over the biological activity of a peptide.

Main Methods:

• Design and synthesis of a novel amino acid analogue featuring a photoisomerizable diarylethene scaffold.
• Incorporation of this analogue into the cyclic backbone of the antimicrobial peptide gramicidin S.
• Evaluation of the biological activity of the modified peptides under UV/Visible light irradiation.

Main Results:

• Successful synthesis of a photo-switchable amino acid analogue.
• Demonstrated incorporation of the analogue into gramicidin S without compromising its structure.
• Effective control of the antimicrobial peptide's biological activity using ultraviolet/visible light.

Conclusions:

• The polypeptide backbone can be conformationally switched by light through the incorporation of photoisomerizable amino acid analogues.
• This approach allows for precise spatial and temporal control over peptide biological activity.
• The developed system offers a novel platform for light-regulated peptide therapeutics and molecular tools.