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Mechanism-Based Inhibitor of DNA Cytosine-5 Methyltransferase by a S N Ar Reaction with an Oligodeoxyribonucleotide Containing a 2-Amino-4-Halopyridine-C-Nucleoside.
Chembiochem : a European Journal of Chemical Biology 2018 April 17
In chromatin, 5-methylcytosine (mC), which represents the fifth nucleobase in genomic DNA, plays a role as an inducer of epigenetic changes. Tumor cells exhibit aberrant DNA methylation patterns, and inhibition of human DNA cytosine-5 methyltransferase (DNMT), which is responsible for generating mC in CpG sequences, is an effective strategy to treat various cancers. Here, we describe the design, synthesis, and evaluation of the properties of 2-amino-4-halopyridine-C-nucleosides (dX P) and oligodeoxyribonucleotides (ODNs) containing dX P as a novel mechanism-based inhibitor of DNMTs. The designed ODN containing X PpG forms a complex with DNMTs by covalent bonding through a nucleophilic aromatic substitution (SN Ar) reaction, and its cell proliferation activity is investigated. This study suggests that dX P in a CpG sequence of DNA could serve as a potential nucleic acid drug lead in cancer chemotherapy and a useful chemical probe for studies of epigenetics. Our molecular design using a SN Ar reaction would be useful for DNMTs and other protein-DNA interactions.
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