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- W2094982971 abstract "The natural nucleic acids (DNA and RNA) can adopt a variety of structures besides the antiparallel double helix described by Watson and Crick, depending on base sequence and solvent conditions. Specifically base-paired DNA structures with regular backbone units include left-handed and parallel duplexes and triple and quadruple helical arrangements. Given the base-pairing pattern of the natural bases, preferences for how single strands associate are determined by the structure and flexibility of the sugar-phosphate backbone. We set out to determine the role of the backbone in complex formation by designing DNA analogs with well defined modifications in backbone structure.We recently developed a DNA analog (bicyclo-DNA) in which one (gamma) of the six torsion angles (alpha-zeta) describing the DNA-backbone conformation is fixed in an orientation that deviates from that observed in B-DNA duplexes by about + 100 degrees , a shift from the synclinal to the antiperiplanar range. Upon duplex formation between homopurine and homopyrimidine sequences, this analog preferentially selects the Hoogsteen and reversed Hoogsteen mode, forming A-T and G-C+ base pairs. Base-pair formation is highly selective, but degeneracy is observed with respect to strand orientation in the duplex.The flexibility and orientation of the DNA backbone can influence the preferences of the natural bases for base-pairing modes, and can alter the relative stability of duplexes and triplexes." @default.
- W2094982971 created "2016-06-24" @default.
- W2094982971 creator A5005121782 @default.
- W2094982971 creator A5007519868 @default.
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- W2094982971 date "1996-03-01" @default.
- W2094982971 modified "2023-10-16" @default.
- W2094982971 title "Bicyclo-DNA: a Hoogsteen-selective pairing system" @default.
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- W2094982971 doi "https://doi.org/10.1016/s1074-5521(96)90263-x" @default.
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