DNA helicase

DNA helicase is an essential enzyme responsible for unwinding double-stranded nucleic acids using energy derived from ATP hydrolysis. This process is fundamental during DNA replication, where the enzyme separates parental strands at the replication fork so that each can serve as a template for new synthesis. In prokaryotes like E. coli, DnaB acts as the main replicative DNA helicase; in eukaryotes, this role is filled by the mini-chromosome maintenance complex (MCM). Beyond replication, various specialized forms of DNA helicase participate in repair, recombination, and other aspects of genome metabolism. Structurally, most active forms are hexameric ring-shaped complexes with conserved sequence motifs involved in ATP binding/hydrolysis and nucleic acid interaction—these motifs define six major superfamilies (SF1–SF6). The directionality of movement along nucleic acids varies among family members. Dysfunctional or mutated human homologs have been implicated in several diseases characterized by chromosomal instability—including certain cancers and rare premature aging syndromes—making them both important biological markers and potential therapeutic targets[1][4][5][7].

Other names

HelicaseDNA unwinding enzymeReplicative helicase (for specific types)DnaB helicase (prokaryotic replicative form)Mini-chromosome maintenance complex (MCM; eukaryotic replicative form)

Drugs targeting DNA helicases would typically act by inhibiting ATP hydrolysis, blocking the enzyme’s ability to unwind double-stranded nucleic acids, thereby halting replication or repair processes essential for cell survival or viral propagation[1][4].