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In this study, we investigate the role of the apex nucleotides of the two turns found in the intramolecular “paperclip” type triplex DNA formed by 5′-TCTCTCCTCTCTAGAGAG-3′. Our previously published structure calculations show that residues C7-A18 form a hairpin turn via Watson-Crick basepairing and residues T1-C6 bind into the major groove of the hairpin via Hoogsteen basepairing resulting in a broad...
In this study, we present the results of structural analysis of an 18-mer DNA 5′-T1C2T3C4T5C6C7T8C9T10C11T12A13G14A15G16A17G18-3′ by proton nuclear magnetic resonance (NMR) spectroscopy and molecular modeling. The NMR data are consistent with characteristics for triple helical structures of DNA: downfield shifting of resonance signals, typical for the H3+ resonances of Hoogsteen-paired cytosines;...
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