Mitomycin C-DNA Interaction Mechanisms
Summary
Mitomycin C is a bioreductive alkylating agent that, upon enzymatic or chemical reduction, forms electrophilic species capable of covalently modifying DNA. Activation of its quinone moiety yields an aziridinium intermediate that targets nucleophilic sites, predominantly the N2 position of guanine, resulting in monoadducts and interstrand crosslinks. These lesions distort the DNA helix, obstruct replication and transcription, and initiate cell-cycle checkpoints. The stereochemistry of each adduct influences recognition by sensor proteins, leading to varied signalling outcomes. Monoadducts are often excised via nucleotide excision repair, while crosslinks require coordinated unhooking by structure-specific nucleases, translesion synthesis and homologous recombination, exemplified by the Fanconi anaemia pathway in eukaryotes. In bacteria, specialised exonucleases detect and excise mitomycin C lesions following conformational activation. The diversity of DNA modifications underpins the agent’s efficacy in chemotherapy and its use as a molecular probe of repair pathways.
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Mitomycin C-DNA Interaction Mechanisms publication trend
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Technical terms
Reductive activation: enzymatic or chemical reduction of mitomycin C to generate its reactive alkylating form.
DNA adduct: a covalent modification of a nucleobase by an external chemical agent.
Interstrand crosslink: a covalent bond linking opposite strands of DNA that impedes strand separation.
Monoadduct: a single covalent bond formed between mitomycin C and one nucleobase.
Exonuclease: an enzyme that removes nucleotides from the ends of DNA strands.
References
- Structural and biochemical characterization of the mitomycin C repair exonuclease MrfB. Nucleic Acids Research (2024).
- Differential Activation of p53 by the Various Adducts of Mitomycin C*. Journal of Biological Chemistry (2002).
- Chemical modification of DNA with muta-carcinogens. III. Reductive alkylation of DNA with mitomycin C.. Environmental Health Perspectives (1985).
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