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- W2012249131 abstract "The conformational dynamics of a 34-base-long pyrimidine·purine-pyrimidine motif intramolecular DNA triple helix possessing three cytosine residues in the Hoogsteen strand (1) and a disulfide cross-linked analog (2) were studied by two-dimensional exchange and NOE spectroscopy and by measuring base-catalyzed imino proton exchange rates. Under acidic conditions that stabilize triplexes containing Hoogsteen strand cytosines (pH 6.0 and 1 °C), sequences 1 and 2 exhibit a small and identical degree of conformational heterogeneity. However, at a higher temperature (pH 6.0 and 37 °C), 1 exhibits much more extensive conformational heterogeneity than 2. The exchange times for Watson−Crick imino protons are ∼1 h for both triplexes. However, the Hoogsteen base-pair lifetimes of 1 could not be measured because this sequence is conformationally labile under the alkaline conditions necessary to conduct these experiments. Because of the extraordinary pH stability conferred by the cross-link, it is possible to estimate the base-pair lifetimes for 2. The lifetimes of the Hoogsteen base pairs range from about 3 to 370 ms, and in all cases are shorter than that of the Watson−Crick base pair contained in the same triplet. These experiments represent the first measurement of base-pair lifetimes within Hoogsteen triplets. The ability to measure individual base-pair lifetimes may prove useful in studies that attempt to modulate triplex properties through rational design." @default.
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- W2012249131 date "1998-01-13" @default.
- W2012249131 modified "2023-10-16" @default.
- W2012249131 title "Use of Cross-Links To Study the Conformational Dynamics of Triplex DNA" @default.
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- W2012249131 doi "https://doi.org/10.1021/bi971342t" @default.
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