Engineering the quadruplex fold: nucleoside conformation determines both folding topology and molecularity in guanine quadruplexes.

Journal of the American Chemical Society
Chung-Fei Tang, Richard H Shafer

Abstract

Nucleic acid quadruplexes, based on the guanine quartet, can arise from one or several strands, depending on the sequence. Those consisting of a single strand are usually folded in one of two principal topologies: antiparallel, in which all or half of the guanine stretches are antiparallel to each other, or parallel, in which all guanine stretches are parallel to each other. In the latter, all guanine nucleosides possess the anti conformation about the glycosidic bond, while in the former, half possess the anti conformation, and half possess the syn conformation. While antiparallel is the more common fold, examples of biologically important, parallel quadruplexes are becoming increasingly common. Thus, it is of interest to understand the forces that determine the quadruplex fold. Here, we examine the influence of individual nucleoside conformation on the overall folding topology by selective substitution of rG for dG. We can reverse the antiparallel fold of the thrombin binding aptamer (TBA) by this approach. Additionally, this substitution converts a unimolecular quadruplex into a bimolecular one. Similar reverse substitutions in the all-RNA analogue of TBA result in a parallel to antiparallel change in topology and alter the ...Continue Reading

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