Bacterial DNA synthesis and repair enzyme

Bacterial DNA synthesis and repair enzymes represent a diverse group of proteins essential for the replication, topological maintenance, and repair of the bacterial genome. This group includes critical enzymes such as DNA gyrase (topoisomerase II), topoisomerase IV, DNA polymerases, and DNA ligases, which collectively ensure the high-fidelity transmission of genetic information during binary fission (Nature Reviews Microbiology, 2017). These enzymes are vital therapeutic targets because their structural and functional characteristics often differ significantly from their human analogs, providing a basis for selective toxicity. Fluoroquinolones, one of the most successful classes of antibiotics, specifically target the DNA gyrase and topoisomerase IV complexes to induce lethal DNA damage (PubMed, PMC2746745). Beyond replication, these enzymes are involved in the SOS response and other repair pathways that allow bacteria to survive environmental stress and antibiotic pressure. Understanding these targets is crucial for developing new agents to combat the rising threat of multi-drug resistant bacterial infections (WHO, 2021).

Other names

Bacterial DNA replication machineryBacterial DNA metabolic enzymesDNA gyraseTopoisomerase IVBacterial DNA polymeraseBacterial DNA ligase

Drugs targeting these enzymes primarily act by inhibiting DNA gyrase and topoisomerase IV, which prevents the relief of torsional strain and the decatenation of daughter chromosomes during replication (StatPearls, 2023). This leads to the formation of stable enzyme-DNA-drug complexes that cause permanent double-strand breaks, triggering bacterial cell death. Other mechanisms include the direct induction of DNA strand breaks through reactive intermediates or the inhibition of DNA polymerases and ligases essential for genome maintenance (PubMed, PMC7072134).