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. 1997 Aug 15;25(16):3269–3274. doi: 10.1093/nar/25.16.3269

Kinetic studies on the formation of intermolecular triple helices.

H M Paes 1, K R Fox 1
PMCID: PMC146877  PMID: 9241240

Abstract

We have used DNase I footprinting to examine the association kinetics of GA-, GT- and CT-containing oligonucleotides with the target sequence (GGA)5GG. (CCT)5CC. These reactions are slow yielding bimolecular association rate constants between 50 and 2000 M-1s-1. We find that GT-containing oligonucleotides bind much faster than GA- or CT-containing third strands. In each case the observed rate constants are faster at the centre than at the edges of the target site. Although several explanations can be offered for this observation, it is consistent with a model in which triplex formation at this repetitive site is achieved via intermediate complexes in which the third strand is not properly aligned with its target and which subsequently migrate to the correct position.

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Selected References

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