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. 1996 Sep 1;24(17):3392–3398. doi: 10.1093/nar/24.17.3392

Triplex-forming oligonucleotides trigger conformation changes of a target hairpin sequence.

E Brossalina 1, E Demchenko 1, Y Demchenko 1, V Vlassov 1, J J Toulmé 1
PMCID: PMC146096  PMID: 8811094

Abstract

We used a DNA duplex formed between the 5' end of a 69mer (69T) and an 11mer (OL7) as a substrate for BamHI. The former oligonucleotide folds into a hairpin structure, the stem of which contains a stretch of pyrimidines in one strand and consequently a stretch of purines in the other strand. The oligomer 69T was used as a target for complementary oligodeoxypyrimidines made of 10 nt (OL1), 16 nt (OL5) or 26 nt (OL2) which can engage the same 10 pyrimidine-purine-pyrimidine triplets with the 69T hairpin stem. Although the binding site of OL7 did not overlap that of OL1, OL2 or OL5, the BamHI activity on 69T-OL7 complexes was drastically modified in the presence of these triplex-forming oligomers: OL1 abolished the cleavage by BamHI whereas OL5 and OL2 strongly increased it. Using footprinting assays and point-mutated oligonucleotides we demonstrated that these variations were due to different conformations of the 69T-OL7 complex induced by the binding of oligomers OL1, OL2 or OL5. Therefore, oligonucleotides can act as structural switchers, offering one additional mode for modulating gene expression.

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Selected References

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