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. 1996 Aug 15;24(16):3181–3188. doi: 10.1093/nar/24.16.3181

Effect of third strand composition on the triple helix formation: purine versus pyrimidine oligodeoxynucleotides.

B Faucon 1, J L Mergny 1, C Héléne 1
PMCID: PMC146071  PMID: 8774898

Abstract

Exon 5 of the human aprt gene contains an oligo-purine-oligopyrimidine stretch of 17 bp (5'-CCCTCTTCTCTCTCCT-3') within the coding region. (T,C)-, (G,T)- and (G,A)-containing oligonucleotides were compared for their ability to form stable triple helices with their DNA target. (G,T) oligodeoxynucleotides, whether parallel or antiparallel, were unable to bind to this sequence. This is in contrast to (G,A) (purine) and (T,C) (pyrimidine) oligonucleotides, which bind to the duplex at near neutral pH. Binding was highly sequence specific, as unrelated competitors were unable to interfere with target recognition. A major difference between the purine and pyrimidine oligodeoxynucleotides was observed in the kinetics of binding: the (G,A) oligonucleotide binds to its target much faster than the (T,C) oligomer. With the purine oligonucleotide, complete binding was achieved in a matter of minutes at micromolar concentrations, whereas several hours were required with the pyrimidine oligomer. Thus, the general observation that triplex formation is slow with pyrimidine oligodeoxynucleotides does not hold for (G,A) oligodeoxynucleotides. Purine and pyrimidine oligodeoxynucleotides covalently linked to a psoralen group were able to induce crosslinks on the double-stranded DNA target upon UV irradiation. This study provides a detailed comparison of the different types of DNA triplexes under the same experimental conditions.

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Selected References

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