G.A mismatches form a variety of hydrogen-bonded structures in DNA, most of which destabilise the duplex. Tandem G.A mismatches in the context YGAR (Y = pyrimidine, R = purine), however, form base pairs using the amino group of the guanine residue [Li, Y., Zon. G. & Wilson, W.D. (1991) Proc. Natl Acad. Sci. USA 88, 26-30], which permits extensive base-base… (More)
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