Abstract
A homopyrimidine 11-mer oligodeoxynucleotide selectively recognizes a 11-bp homopurine. homopyrimidine sequence in duplex DNA of simian virus 40 (SV40). Binding occurs in the major groove via Hoogsten base pairing of thymine and protonated cytosine to Watson-Crick A.T and G.C base pairs, respectively. The 11-mer oligonucleotide was covalently linked to 5-amino-1,10-phenanthroline via different linkers. Efficient cleavage of SV40 circular DNA was observed in the presence of Cu2+ and a reducing agent when a pentamethylene carboxamide linker was used to tether phenanthroline to a 5’-thiophosphate group of the 11-mer oligonucleotide. The distribution of the cleavage sites on the two strands was asymmetric. They were shifted towards the 3’-side indicating that cleavage occurred from the minor groove. Recognition of the major groove by the oligonucleotide and intercalation of phenanthroline at the triplex-duplex junction account for the observed sequence-specific cleavage reaction from within the minor groove. An ellipticine derivative was covalently attached to the 3’-end of the 11-mer oligonucleotide. Upon irradiation at wavelengths longer than 300 nm the DNA target was cleaved at the positions expected if the oligonucleotide binds in a parallel orientation to the homopurine sequence. In addition it was shown that triple helix formation by the unsubstituted 11-mer oligonucleotide targeted a photo-induced cleavage by free ellipticine derivatives at the triplex-duplex junctions. Molecular modeling and energy minimization studies revealed that the distortion at the triplex-duplex junctions could account for these results.
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Helene, C., Francois, J.C., Giovannangeli, C., Saison-Behmoaras, T., Asseline, U., Thuong, N.T. (1990). Sequence-Specific Recognition and Cleavage of Duplex DNA by Derivatized Oligonucleotides. In: Pullman, B., Jortner, J. (eds) Molecular Basis of Specificity in Nucleic Acid-Drug Interactions. The Jerusalem Symposia on Quantum Chemistry and Biochemistry, vol 23. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3728-7_20
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DOI: https://doi.org/10.1007/978-94-011-3728-7_20
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