Bacterial DNA synthesis and repair enzymes

Bacterial DNA synthesis and repair enzymes comprise a large group of essential proteins responsible for the replication of DNA, correction of replication errors, removal of DNA lesions, and overall genome maintenance in bacteria. Key families include DNA polymerases (responsible for replicative synthesis and repair gap-filling), DNA ligases (sealing nicks), DNA helicases (unwinding strands), topoisomerases (relieving supercoiling), and specific repair enzymes such as UvrABC excinuclease (nucleotide excision repair), DNA glycosylases (base excision repair), and the MutS/L/H system (mismatch repair)[4][5][6]. Drugs such as quinolones target bacterial topoisomerases, causing double-strand breaks that bacteria cannot repair, leading to cell death[5]. These enzymes are prime antibacterial targets because they are essential for bacterial viability and differ structurally from human counterparts, allowing for selective inhibition. However, "Bacterial enzymes involved in DNA synthesis/repair" is not a single molecular target, but rather a class or group covering multiple distinct, well-defined enzymes, each with its own gene name, structure, and druggability profile[5][2][6].

Other names

DNA replication enzymes (bacterial)bacterial DNA repair enzymesDNA polymerases (bacterial)DNA ligases (bacterial)UvrABC excinucleaseDNA glycosylases (bacterial)MutS/L/H proteins (bacterial)

Quinolones: inhibit DNA gyrase and topoisomerase IV, blocking DNA replication and repair in bacteria Nitrofuran drugs: induce DNA damage, overwhelming bacterial repair capacity Some ligase inhibitors: block sealing of DNA breaks Alkylating antibiotics: create DNA lesions that require bacterial repair pathways for survival