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. 1989 Dec;86(23):9198–9202. doi: 10.1073/pnas.86.23.9198

Sequence-specific intercalating agents: intercalation at specific sequences on duplex DNA via major groove recognition by oligonucleotide-intercalator conjugates.

J S Sun 1, J C François 1, T Montenay-Garestier 1, T Saison-Behmoaras 1, V Roig 1, N T Thuong 1, C Hélène 1
PMCID: PMC298461  PMID: 2594761

Abstract

An acridine derivative was covalently linked to the 5' end of a homopyrimidine oligonucleotide. Specific binding to a homopurine-homopyrimidine sequence of duplex DNA was demonstrated by spectroscopic studies (absorption and fluorescence) and by "footprinting" experiments with a copper phenanthroline chelate used as an artificial nuclease. A hypochromism and a red shift of the acridine absorption were observed. Triple-helix formation was also accompanied by a hypochromism in the ultraviolet range. The fluorescence of the acridine ring was quenched by a stacking interaction with a G.C base pair adjacent to the homopurine-homopyrimidine target sequence. The intercalating agent strongly stabilized the complex formed by the oligopyrimidine with its target duplex sequence. Cytosine methylation further increased the stability of the complexes. Footprinting studies revealed that the oligopyrimidine binds in a parallel orientation with respect to the homopurine-containing strand of the duplex. The intercalated acridine extended by 2 base pairs the region of the duplex protected by the oligopyrimidine against degradation by the nuclease activity of the copper phenanthroline chelate. Random intercalation of the acridine ring was lost due to the repulsive effect of the negatively charged oligonucleotide tail. Intercalation occurred only at those double-stranded sequences where the homopyrimidine oligonucleotide recognized the major groove of duplex DNA.

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Selected References

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