Synthesis and Structure-Activity Relationship Studies of C2-Modified Analogs of the Antimycobacterial Natural Product Pyridomycin

J Med Chem. 2020 Feb 13;63(3):1105-1131. doi: 10.1021/acs.jmedchem.9b01457. Epub 2020 Jan 21.

Abstract

A series of derivatives of the antimycobacterial natural product pyridomycin have been prepared with the C2 side chain attached to the macrocyclic core structure by a C-C single bond, in place of the synthetically more demanding enol ester double bond found in the natural product. Hydrophobic C2 substituents of sufficient size generally provide for potent anti-Mtb activity of these dihydropyridomycins (minimum inhibitory concentration (MIC) values around 2.5 μM), with several analogs thus approaching the activity of natural pyridomycin. Surprisingly, some of these compounds, in contrast to pyridomycin, are insensitive to overexpression of InhA in Mycobacterium tuberculosis (Mtb). This indicates that their anti-Mtb activity does not critically depend on the inhibition of InhA and that their overall mode of action may differ from that of the original natural product lead.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antitubercular Agents / chemical synthesis
  • Antitubercular Agents / chemistry
  • Antitubercular Agents / pharmacology*
  • Bacterial Proteins / antagonists & inhibitors
  • Enzyme Inhibitors / chemical synthesis
  • Enzyme Inhibitors / chemistry
  • Enzyme Inhibitors / pharmacology*
  • Microbial Sensitivity Tests
  • Molecular Structure
  • Mycobacterium tuberculosis / drug effects
  • Oligopeptides / chemical synthesis
  • Oligopeptides / chemistry
  • Oligopeptides / pharmacology*
  • Oxidoreductases / antagonists & inhibitors
  • Structure-Activity Relationship

Substances

  • Antitubercular Agents
  • Bacterial Proteins
  • Enzyme Inhibitors
  • Oligopeptides
  • Oxidoreductases
  • InhA protein, Mycobacterium
  • pyridomycin