Comparative in vitro activity profiles of novel bis-indole antibacterials against gram-positive and gram-negative clinical isolates
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Updated: Jun 11, 2026

Metabolic Profiling to Determine Bactericidal or Bacteriostatic Effects of New Natural Products using Isothermal Microcalorimetry
Published on: October 29, 2020
Michelle M Butler1, John D Williams, Norton P Peet
1Microbiotix, Inc., One Innovation Drive, Worcester, MA 01605, USA. mbutler@microbiotix.com
Abstract:
Antimicrobial susceptibilities of 233 gram-positive and 180 gram-negative strains to two novel bis-indoles were evaluated. Both compounds were potent inhibitors of gram-positive bacteria, with MIC(90) values of 0.004 to 0.5 microg/ml. One bis-indole, MBX 1162, exhibited potent activity against all gram-negative strains, with MIC(90) values of 0.12 to 4 microg/ml, even against high-level-resistant pathogens, and compared favorably to all comparator antibiotics. The bis-indole compounds show promise for the treatment of multidrug-resistant clinical pathogens.
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