Cellular DNA synthesis and replication machinery (DNA replication machinery)

The cellular DNA synthesis and replication machinery is a highly coordinated multi-protein system, often referred to as the replisome, responsible for the faithful duplication of the genome during the S phase of the cell cycle (Bell & Labib, 2016). This machinery includes essential enzymes such as DNA polymerases, helicases, primases, topoisomerases, and ligases, which work together to unwind the DNA double helix and synthesize new complementary strands (Fragkos et al., 2015). Because rapid and uncontrolled cell division is a hallmark of cancer, this machinery is a primary target for many traditional chemotherapeutic agents (O'Connor, 2015). Drugs like antimetabolites interfere with the production of nucleotide precursors, while topoisomerase inhibitors prevent the relief of torsional strain, leading to lethal DNA strand breaks (StatPearls, "Antimetabolites"). Additionally, certain antiviral and antibacterial drugs specifically target the replication machinery of pathogens to halt their proliferation (PubMed, "DNA replication as a target"). However, since these processes are also vital for normal regenerative tissues, targeting this machinery often results in significant systemic toxicities, such as bone marrow suppression and damage to the intestinal lining (NIH, "Chemotherapy Side Effects").

Other names

ReplisomeDNA replication complexDNA synthesis apparatusDNA replication machinery

Inhibition of DNA polymerases, depletion of deoxyribonucleotide triphosphates (dNTPs), induction of DNA strand breaks through topoisomerase inhibition, and DNA cross-linking (StatPearls, "Antimetabolites"; O'Connor, 2015).