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Publication Abstract from PubMed

A (3+1)-hybrid-type G-quadruplex was substituted within its central tetrad by a single 2'-fluoro-modified guanosine. Driven by the anti-favoring nucleoside analogue, a novel quadruplex fold with inversion of a single G-tract and conversion of a propeller loop into a lateral loop emerges. In addition, scalar couplings across hydrogen bonds demonstrate the formation of intra- and inter-residual FH8-C8 pseudo-hydrogen bonds within the modified quadruplexes. Alternative folding can be rationalized by the impact of fluorine on intermediate species on the basis of a kinetic partitioning mechanism. Apparently, chemical or other environmental perturbations are able to redirect folding of a quadruplex, possibly modulating its regulatory role in physiological processes.

Fluorine-Mediated Editing of a G-Quadruplex Folding Pathway.,Dickerhoff J, Weisz K Chembiochem. 2018 Feb 20. doi: 10.1002/cbic.201800099. PMID:29460996^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.