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Cell permeable vanX inhibitors as vancomycin re-sensitizing agents.

Ramaiah Muthyala1, Namrata Rastogi1, Woo Shik Shin2

  • 1Center for Orphan Drug Research, University of Minnesota, 717 Delaware St SE, Minneapolis, MN 55455, United States; Department of Experimental & Clinical Pharmacology, University of Minnesota, 717 Delaware St SE, Minneapolis, MN 55455, United States.

Bioorganic & Medicinal Chemistry Letters
|April 23, 2014
PubMed
Summary

New peptide analogs targeting the VanX enzyme were developed to combat vancomycin-resistant Enterococci (VREF). These compounds show promise in restoring vancomycin effectiveness against resistant bacterial infections.

Keywords:
AntibioticsDrug resistancePyrithioneThiohydroxamic acidVanXVancomycin

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Area of Science:

  • Biochemistry
  • Microbiology
  • Medicinal Chemistry

Background:

  • Vancomycin-resistant Enterococci (VREF) pose a significant threat due to resistance mechanisms.
  • The VanX enzyme is crucial for bacterial cell wall remodeling and VREF development.
  • Developing agents to overcome vancomycin resistance is a critical medical need.

Purpose of the Study:

  • To design, synthesize, and investigate novel peptide analogs as vancomycin re-sensitizing agents.
  • To evaluate the inhibitory activity and cytotoxicity of these analogs against the VanX enzyme.
  • To assess the potential of these compounds in restoring vancomycin sensitivity in VREF.

Main Methods:

  • Design and synthesis of cyclic thiohydroxamic acid-based peptide analogs.
  • In vitro enzymatic assays to determine inhibitory activity against VanX.
  • Cytotoxicity assessments.
  • Testing the efficacy of analogs in increasing vancomycin sensitivity against VREF.

Main Results:

  • Two novel peptide analogs demonstrated low micromolar inhibitory activity against VanX.
  • The synthesized compounds exhibited low cytotoxicity.
  • These analogs successfully increased vancomycin sensitivity in VREF.

Conclusions:

  • Cyclic thiohydroxamic acid-based peptide analogs are effective inhibitors of VanX.
  • These compounds represent a promising platform for developing new strategies against vancomycin resistance.
  • The improved pharmacological properties offer an advantage over previous transition state mimics.