Abstract
Antisense oligodeoxyribonucleotides (15mers), containing a 2-(N-iodoacetylaminoethyl)thio-adenine, were synthesized and tested for their ability to cleave complementary DNAs (21mers). Cleavage of the target DNAs was done by alkylation followed by treatment with piperidine, and the positions of the alkylated sites were estimated by identification of the cleaved products. By using several combinations of the modified strands and their target DNAs, it was determined that alkylation occurred at adenine or guanine, depending on the torsion angle of the modified nucleoside.
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