Bacterial DNA replication and repair machinery

The bacterial DNA replication and repair machinery is a complex, multi-protein system responsible for the faithful duplication and maintenance of the bacterial genome [1, 3]. Central to this machinery is the replisome, which includes essential enzymes such as DNA polymerase III, helicases, primases, and sliding clamps (DnaN) that coordinate leading and lagging strand synthesis [4, 11]. Additionally, topoisomerases like DNA gyrase and topoisomerase IV manage the topological stress and decatenation required for successful replication and segregation [2, 8]. This machinery is a cornerstone of antimicrobial therapy, with the fluoroquinolone class of antibiotics being the most prominent inhibitors, acting by trapping DNA gyrase and topoisomerase IV in a state that causes lethal double-strand breaks [2, 10]. Other components, such as the sliding clamp and DNA ligase, are emerging as high-value targets for novel drug development to combat multi-drug resistant pathogens [1, 13]. Because bacterial replication proteins are structurally distinct from their eukaryotic counterparts, they offer a high degree of selectivity, although the rapid evolution of resistance remains a primary clinical challenge [5, 8].

Other names

Bacterial replisomeBacterial DNA synthesis machineryBacterial DNA replication systemBacterial DNA metabolism

Inhibition of DNA gyrase and topoisomerase IV by stabilizing enzyme-DNA cleaved complexes or inhibiting ATPase activity; inhibition of replicative DNA polymerases (e.g., Pol III); inhibition of DNA ligase; induction of DNA strand breaks; and targeting of the sliding clamp (DnaN) to disrupt processivity [2, 8, 10].