Deoxyribonucleic acid adenine N7 (DNA N7-Ade) (DNA N7-Ade)

The N7 position of adenine in DNA is a highly nucleophilic site located within the major groove of the double helix, making it a significant target for electrophilic chemotherapeutic agents (PubChem, CID 5702198). While the N7 of guanine is the most frequent site of DNA alkylation, the N7 of adenine also forms stable covalent adducts with platinum-based drugs such as cisplatin and various alkylating agents like busulfan (PubMed, PMID 11511583). These modifications result in the formation of DNA cross-links that physically obstruct the machinery required for DNA replication and RNA transcription (StatPearls, 'Antineoplastic Alkylating Agents'). The accumulation of these lesions disrupts genomic integrity and activates programmed cell death pathways, which is the primary mechanism for treating diverse cancers (NIH, National Cancer Institute). However, because these drugs target DNA non-specifically, they carry risks of significant toxicity, including bone marrow suppression and the potential for inducing secondary leukemias due to their mutagenic properties (PubMed, PMID 25605301).

Other names

DNA N7 of adenineN7-adenine DNA siteAdenine N7 positionN7-alkyladenineDNA N7-adenine

Covalent binding to the N7 position of adenine, leading to DNA adduct formation and cross-linking, which inhibits DNA synthesis and triggers apoptosis (PubMed, PMID 11511583).