Bacterial DNA replication and synthesis proteins

Bacterial DNA replication and synthesis proteins comprise the essential multi-protein machinery, often referred to as the replisome, required for the duplication of the bacterial chromosome (NIH, 2017). This complex includes core enzymes such as DNA polymerase III, which executes strand elongation, and DNA helicase (DnaB), which unwinds the double helix (MDPI, 2017). Additionally, type II topoisomerases, specifically DNA gyrase and topoisomerase IV, are critical for managing the topological constraints, such as supercoiling and decatenation, that arise during the replication process (ResearchGate, 2017). These proteins are highly attractive therapeutic targets because they are essential for bacterial viability and possess structural features distinct from their eukaryotic counterparts, allowing for selective toxicity (LibreTexts, 2024). Fluoroquinolones are the most clinically significant class of drugs targeting this system, acting by trapping gyrase and topoisomerase IV in a state that causes lethal double-strand DNA breaks (NIH, 2020). Other agents, such as aminocoumarins, inhibit the process by competitively blocking ATP binding to the gyrase B subunit (ResearchGate, 2017). Emerging therapies, such as novel bacterial topoisomerase inhibitors (NBTIs) and DNA polymerase inhibitors, are being developed to overcome the widespread resistance caused by mutations in these target proteins (NIH, 2026). Targeting this machinery remains a cornerstone of treating a wide range of bacterial infections, though the rise of target-mediated resistance remains a significant clinical challenge (NIH, 2017).

Other names

Bacterial replisomeBacterial DNA replication machineryBacterial DNA synthesis enzymesBacterial DNA replication complex

Inhibition of bacterial type II topoisomerases (DNA gyrase and topoisomerase IV) by stabilizing cleaved DNA-protein complexes or blocking ATP binding; inhibition of replicative DNA polymerases (PolC, DnaE) and DNA ligase (LigA) to prevent DNA strand elongation and nick sealing.