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Inhibitors of anthrax lethal factor.

Brandon D Gaddis1, Larisa V Avramova, Jean Chmielewski

  • 1Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA.

Bioorganic & Medicinal Chemistry Letters
|June 19, 2007
PubMed
Summary

Researchers identified potent inhibitors of anthrax lethal factor (LF) that block lethal toxin-mediated cell death. These compounds act as uncompetitive inhibitors, showing significant potency with low cytotoxicity.

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Area of Science:

  • Biochemistry
  • Pharmacology
  • Microbiology

Background:

  • Anthrax lethal toxin causes cell death.
  • Anthrax lethal factor (LF) is a key component of the toxin.
  • Inhibitors are needed to counteract LF's effects.

Purpose of the Study:

  • To identify inhibitors of anthrax lethal toxin-mediated cell death.
  • To characterize the mechanism of inhibition by identified compounds.
  • To optimize inhibitor potency and assess cytotoxicity.

Main Methods:

  • Medium throughput cell-based screening.
  • Structure-activity relationship (SAR) studies.
  • Enzyme kinetics and mechanistic studies.

Main Results:

  • A compound inhibiting LF-mediated cell death was identified.
  • Subsequent SAR studies yielded a more potent inhibitor.
  • Both compounds were uncompetitive inhibitors of LF with low micromolar Ki values.
  • Effective cell potency and low cytotoxicity were observed.

Conclusions:

  • Novel uncompetitive inhibitors of anthrax lethal factor were discovered.
  • These inhibitors demonstrate potential for therapeutic development against anthrax.
  • The identified compounds exhibit favorable potency and safety profiles.