To systematically understand the effect of 2-N-heteroarylguanine (G) modification on the stability of higher-order DNA structures, nucleoside derivatives and oligodeoxyribonucleotides containing guanine residues modified with four kinds of hereroaryl groups on the 2-amino group were synthesized. The stabilities of the DNA duplex and the parallel-oriented DNA triplex containing these Gs were studied by measuring their melting temperatures (T). T experiments and DFT calculations of the modified guanine nucleobases suggested that the base pair formation energy and stability of the two conformations, i.e., the open- and closed-type conformations, are key to determining the stability of the DNA duplex. Finally, the DNA triplex was destabilized when modified guanine residues were introduced into triplex-forming oligonucleotides.
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