DNA synthesis and repair enzymes

DNA synthesis and repair enzymes represent a broad and essential class of proteins responsible for the faithful replication of the genome and the correction of DNA damage. This group includes DNA polymerases, which catalyze the polymerization of deoxyribonucleotides; topoisomerases, which manage the topological state of DNA during replication; and various repair enzymes such as PARP1 and DNA ligases that maintain genomic integrity (Hubscher et al., 2002, Annual Review of Biochemistry). In oncology, these enzymes are critical therapeutic targets because rapidly proliferating cancer cells exhibit a high demand for DNA synthesis and often rely on specific repair pathways to survive high levels of replication stress (Lord & Ashworth, 2012, Nature). Pharmacological intervention includes the use of antimetabolites that deplete nucleotide pools, topoisomerase poisons that induce lethal DNA breaks, and PARP inhibitors that exploit synthetic lethality in BRCA-deficient tumors (Nitiss, 2009, Nature Reviews Cancer). Beyond cancer, these enzymes are also targeted by antiviral and antibacterial agents to selectively inhibit pathogen replication. However, because these enzymes are also vital for the maintenance of healthy tissues, drugs targeting this class often carry significant side effects, most notably bone marrow suppression and gastrointestinal distress (Longley et al., 2003, Nature Reviews Cancer).

Other names

DNA metabolic enzymesDNA replication machineryDNA damage response proteinsDDR enzymesNucleic acid synthesis enzymes

Drugs targeting these enzymes typically act by inhibiting the synthesis of nucleotide precursors, directly blocking DNA polymerase activity, trapping topoisomerases on DNA to create double-strand breaks, or inhibiting repair proteins like PARP to induce synthetic lethality in cells with existing repair deficiencies.