Multiple bacterial macromolecules (DNA, RNA, and proteins)

Multiple bacterial macromolecules, including DNA, RNA, and various cellular proteins, serve as the collective target for reactive metabolites derived from nitro-group-containing antimicrobial agents. These drugs, such as metronidazole and nitrofurantoin, act as prodrugs that require reductive activation by specific microbial enzymes like nitroreductases or pyruvate:ferredoxin oxidoreductase (PFOR) found in anaerobic bacteria and protozoa (StatPearls, 2023). Once reduced, the resulting short-lived, highly reactive intermediates—such as nitroso radicals and hydroxylamines—induce oxidative stress and form covalent adducts with bacterial DNA, leading to strand breakage and the inhibition of nucleic acid synthesis (PubMed, PMID: 15833283). Additionally, these intermediates disrupt protein function and metabolic pathways by modifying essential enzymes and ribosomal components (PubChem, CID 4168). This multi-targeted approach provides potent bactericidal activity and reduces the likelihood of resistance development compared to drugs targeting a single enzyme. The selectivity of this mechanism relies on the low redox potential environment of anaerobic organisms or the presence of specific microbial activating enzymes not found in human cells (NIH, 2022).

Other names

Bacterial DNABacterial proteinsBacterial RNAReactive nitro-intermediates targetsBacterial nucleic acids

Reductive activation of nitro-containing prodrugs by microbial enzymes (e.g., nitroreductases or pyruvate:ferredoxin oxidoreductase) generates reactive intermediates (nitroso radicals, hydroxylamines) that covalently bind to and damage DNA, RNA, and proteins, leading to cell death.