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10:11
Glycopeptide Capture for Cell Surface Proteomics
Published on: May 9, 2014
Glycopeptide sulfation evades resistance
Lindsay Kalan1, Julie Perry, Kalinka Koteva
1M. G. DeGroote Institute for Infectious Disease Research, Department of Biochemistry and Biomedical Sciences, DeGroote School of Medicine, McMaster University, Hamilton, Ontario, Canada.
Journal of Bacteriology
|October 30, 2012
Summary
Sulfation of glycopeptide antibiotics, previously thought to decrease activity, actually reduces their ability to induce resistance. This finding offers a new strategy for developing antibiotics that combat microbial resistance.
Area of Science:
- Microbiology
- Medicinal Chemistry
- Biochemistry
Background:
- Antibiotic resistance is a growing global health threat, with resistance emerging even to critical drugs like vancomycin.
- Glycopeptide antibiotics, derived from Actinomycetes, possess a heptapeptide core modified by various chemical groups to enhance their properties.
- The role of sulfation, a rare glycopeptide modification, remains unclear, with prior studies suggesting reduced antibiotic activity.
Purpose of the Study:
- To investigate the biological role and impact of glycopeptide sulfation on antibiotic activity and resistance mechanisms.
- To elucidate how sulfation affects glycopeptide binding to bacterial cell wall precursors.
- To determine the effect of sulfation on the induction of antibiotic resistance genes.
Main Methods:
- Assessing the binding affinity of sulfated glycopeptides to d-Ala-d-Ala peptidoglycan precursors.
- Analyzing the impact of sulfation on glycopeptide dimerization.
- Quantifying the induction of the vanHAX resistance gene cluster in actinomycetes by sulfated glycopeptides.
Main Results:
- Sulfation minimally affects glycopeptide binding to their bacterial cell wall target.
- Sulfation significantly influences glycopeptide dimerization.
- Sulfated glycopeptides are substantially weaker inducers of the vanHAX resistance gene cluster.
Conclusions:
- Glycopeptide sulfation plays a role in modulating antibiotic resistance rather than directly impacting target binding.
- Sulfation's effect on dimerization and reduced induction of resistance genes suggests a novel avenue for antibiotic development.
- Understanding glycopeptide modifications like sulfation is crucial for designing next-generation antibiotics to overcome resistance.
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