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Bioconjug Chem. 2015 Aug 19;26(8):1475-8. doi: 10.1021/acs.bioconjchem.5b00352. Epub 2015 Jul 24.

Critical Effect of Base Pairing of Target Pyrimidine on the Interstrand Photo-Cross-Linking of DNA via 3-Cyanovinylcarbazole Nucleoside.

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School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahi-dai, Nomi, Ishikawa 923-1292, Japan.


To evaluate the effect of base pairing of the target pyrimidine on the interstrand photo-cross-linking reaction of DNA via 3-cyanovinylcarbazole nucleoside ((CNV)K), a complementary base of target pyrimidine was substituted with noncanonical purine bases or 1,3-propandiol (S). As the decrease of the hydrogen bonds in the base pairing of target C accelerated the photo-cross-linking reaction markedly (3.6- to 7.7-fold), it can be concluded that the number of hydrogen bonds in the base pairing, i.e., the stability of base pairing, of the target pyrimidine plays a critical role in the interstrand photo-cross-linking reaction. In the case of G to S substitution, the highest photoreactivity toward C was observed, whose photoreaction rate constant (k = 2.0 s(-1)) is comparable to that of (CNV)K toward T paired with A (k = 3.5 s(-1)). This is the most reactive photo-cross-linking reaction toward C in the sequence specific interstrand photo-cross-linking. This might facilitate the design of the photo-cross-linkable oligodeoxyribonucleotides for various target sequences.

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