Microbial DNA replication enzyme

Microbial DNA replication enzymes refer collectively to the proteins that orchestrate the copying of microbial (usually prokaryotic) DNA prior to cell division. This includes DNA polymerases that synthesize the new DNA strand, helicases that unwind the double helix, topoisomerases (including DNA gyrase and topoisomerase IV) that manage DNA supercoiling and unlink daughter chromosomes, DNA ligases that seal nicks in the DNA backbone, primases that synthesize RNA primers for DNA synthesis, and accessory proteins (e.g., single-stranded binding proteins, clamps, clamp loaders). These enzymes are essential for microbial survival, highly conserved across species, and are validated targets for antimicrobial drug discovery, with several classes of antibiotics (notably fluoroquinolones and aminocoumarins) exerting effects by inhibiting topoisomerases. Many replication enzymes remain underexploited as antibiotic targets, and emerging resistance has made these targets increasingly critical in the search for new treatments.

Other names

DNA replication enzyme (microbial)bacterial DNA replication machinerymicrobial replisome component

Inhibition of DNA gyrase: interferes with supercoiling and decatenation of DNA Poisoning of topoisomerase IV: blocks chromosome segregation β-clamp inhibition: disrupts processivity of DNA polymerase DNA ligase inhibition: blocks sealing of DNA nicks, preventing chromosome integrity Helicase/primase inhibition: disrupts strand separation or primer synthesis (less developed clinically)