Synthesis of DNA Oligodeoxynucleotides Containing Site-Specific 1,3-Butadiene-Deoxyadenosine Lesions

Current Protocols in Nucleic Acid Chemistry
Susith WickramaratneNatalia Tretyakova

Abstract

Post-oligomerization synthesis is a useful technique for preparing site-specifically modified DNA oligomers. This approach involves site-specific incorporation of inherently reactive halogenated nucleobases into DNA strands using standard solid-phase synthesis, followed by post-oligomerization nucleophilic aromatic substitution (SNAr) reactions with carcinogen-derived synthons. In these reactions, the inherent reactivities of DNA and carcinogen-derived species are reversed: the modified DNA nucleobase acts as an electrophile, while the carcinogen-derived species acts as a nucleophile. In the present protocol, we describe the use of the post-oligomerization approach to prepare DNA strands containing site- and stereospecific N6-adenine and N1,N6-adenine adducts induced by epoxide metabolites of the known human and animal carcinogen 1,3-butadiene (BD). The resulting oligomers containing site-specific, structurally defined DNA adducts can be used in structural and biological studies to reveal the roles of specific BD adducts in carcinogenesis and mutagenesis.

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Citations

Nov 2, 2016·Biochemistry·Susith WickramaratneNatalia Tretyakova
Jan 19, 2019·Current Protocols in Nucleic Acid Chemistry·Pratibha P GhodkeF Peter Guengerich

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