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Antibacterial cyclic D,L-alpha-glycopeptides.

Leila Motiei1, Shai Rahimipour, Desiree A Thayer

  • 1Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.

Chemical Communications (Cambridge, England)
|June 27, 2009
PubMed
Summary

Researchers designed and synthesized novel cationic cyclic glycopeptides. These compounds show promising membrane activity and in vitro antibacterial effects against pathogens.

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Area of Science:

  • Medicinal Chemistry
  • Biophysics
  • Antimicrobial Research

Background:

  • The rise of antibiotic resistance necessitates the development of new antimicrobial agents.
  • Cyclic peptides offer unique structural scaffolds for drug design.
  • Glycosylation can modulate peptide properties, including membrane interactions and efficacy.

Purpose of the Study:

  • To design, synthesize, and characterize novel cationic cyclic D,L-alpha-glycopeptides.
  • To evaluate the membrane activity and biophysical properties of these glycopeptides.
  • To assess the in vitro antibacterial activities of the synthesized compounds.

Main Methods:

  • Design and synthesis of cyclic glycopeptides with varying glycosyl side chains (d-glucosamine, D-galactose, D-mannose).
  • Membrane interaction studies using techniques like liposome leakage assays.
  • Biophysical characterization including circular dichroism and mass spectrometry.
  • In vitro antibacterial assays against a panel of bacterial strains.

Main Results:

  • Successful synthesis of cationic cyclic D,L-alpha-glycopeptides with distinct glycosyl moieties.
  • Demonstrated membrane-disrupting activity, varying with the type of glycosyl side chain.
  • Characterization revealed specific conformational and stability profiles.
  • Significant in vitro antibacterial activities were observed, highlighting potential therapeutic applications.

Conclusions:

  • Cationic cyclic glycopeptides represent a promising class of antimicrobial agents.
  • The nature of the glycosyl side chain significantly influences membrane activity and antibacterial efficacy.
  • Further investigation into these glycopeptides could lead to novel therapeutic strategies against bacterial infections.