Ag+-Mediated DNA Base Pairing: Extraordinarily Stable Pyrrolo-dC–Pyrrolo-dC Pairs Binding Two Silver Ions
2013
Mei, Hui | Röhl, Ingo | Seela, Frank
6-Substituted pyrrolo-dC–pyrrolo-dC mismatches selectively capture silver ions to form extraordinarily stable metal-mediated base pairs. One single modification in a 12-mer duplex causes a Tₘ increase of 36.0 °C relative to the metal-free mismatched duplex. Spectrophotometric titrations as well as ESI mass spectra confirmed the binding of two silver ions per base pair. The Ag⁺-mediated base pairs may permit the construction of metal-responsive DNA with a very high silver loading.
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