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• W2034253012 endingPage "2474" @default.
• W2034253012 startingPage "2461" @default.
• W2034253012 abstract "Single-stranded DNA or double-stranded DNA has the potential to adopt a wide variety of unusual duplex and hairpin motifs in the presence (trans) or absence (cis) of ligands. Several principles for the formation of those unusual structures have been established through the observation of a number of recurring structural motifs associated with different sequences. These include: (i) internal loops of consecutive mismatches can occur in a B-DNA duplex when sheared base pairs are adjacent to each other to confer extensive cross- and intra-strand base stacking; (ii) interdigitated (zipper-like) duplex structures form instead when sheared G*A base pairs are separated by one or two pairs of purine*purine mismatches; (iii) stacking is not restricted to base, deoxyribose also exhibits the potential to do so; (iv) canonical G*C or A.T base pairs are flexible enough to exhibit considerable changes from the regular H-bonded conformation. The paired bases become stacked when bracketed by sheared G.A base pairs, or become extruded out and perpendicular to their neighboring bases in the presence of interacting drugs; (v) the purine-rich and pyrimidine-rich loop structures are notably different in nature. The purine-rich loops form compact triloop structures closed by a sheared G*A, A*A, A*C or sheared-like G(anti)*C(syn) base pair that is stacked by a single residue. On the other hand, the pyrimidine-rich loops with a thymidine in the first position exhibit no base pairing but are characterized by the folding of the thymidine residue into the minor groove to form a compact loop structure. Identification of such diverse duplex or hairpin motifs greatly enlarges the repertoire for unusual DNA structural formation." @default.
• W2034253012 created "2016-06-24" @default.
• W2034253012 creator A5029711136 @default.
• W2034253012 date "2003-05-15" @default.
• W2034253012 modified "2023-10-13" @default.
• W2034253012 title "Unusual DNA duplex and hairpin motifs" @default.
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