Adduct Formation of Delamanid with NAD in Mycobacteria

Antimicrob Agents Chemother. 2020 Apr 21;64(5):e01755-19. doi: 10.1128/AAC.01755-19. Print 2020 Apr 21.

Abstract

Delamanid (DLM), a nitro-dihydroimidazooxazole derivative currently approved for pulmonary multidrug-resistant tuberculosis (TB) therapy, is a prodrug activated by mycobacterial 7,8-didemethyl-8-hydroxy 5-deazaflavin electron transfer coenzyme (F420)-dependent nitroreductase (Ddn). Despite inhibiting the biosynthesis of a subclass of mycolic acids, the active DLM metabolite remained unknown. Comparative liquid chromatography-mass spectrometry (LC-MS) analysis of DLM metabolites revealed covalent binding of reduced DLM with a nicotinamide ring of NAD derivatives (oxidized form) in DLM-treated Mycobacterium tuberculosis var. Bacille de Calmette et Guérin. Isoniazid-resistant mutations in the type II NADH dehydrogenase gene (ndh) showed a higher intracellular NADH/NAD ratio and cross-resistance to DLM, which were restored by complementation of the mutants with wild-type ndh Our data demonstrated for the first time the adduct formation of reduced DLM with NAD in mycobacterial cells and its importance in the action of DLM.

Keywords: Mycobacterium; delamanid; drug; tuberculosis.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antitubercular Agents / pharmacology*
  • Chromatography, Liquid
  • Drug Resistance, Multiple, Bacterial / genetics
  • Isoniazid / pharmacology
  • Mass Spectrometry
  • Mycobacterium tuberculosis / drug effects*
  • Mycobacterium tuberculosis / genetics*
  • Mycolic Acids / metabolism
  • NAD / analysis
  • NADH Dehydrogenase / genetics
  • Nitroimidazoles / pharmacology*
  • Oxazoles / pharmacology*
  • Oxidation-Reduction
  • Polymorphism, Single Nucleotide / genetics
  • Tuberculosis, Multidrug-Resistant / drug therapy
  • Tuberculosis, Multidrug-Resistant / genetics*
  • Tuberculosis, Pulmonary / drug therapy*

Substances

  • Antitubercular Agents
  • Mycolic Acids
  • Nitroimidazoles
  • OPC-67683
  • Oxazoles
  • NAD
  • NADH dehydrogenase II
  • NADH Dehydrogenase
  • Isoniazid