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An evolved fluorescent ribonucleoside alphabet comprising isomorphic purine ((tz)A, (tz)G) and pyrimidine ((tz)U, (tz)C) analogues, all derived from isothiazolo[4,3-d]pyrimidine as a common heterocyclic core, is described. Structural and biochemical analyses illustrate that the nucleosides, particularly the C-nucleosidic purine analogues, are faithful isomorphic and isofunctional surrogates of their natural counterparts and show improved features when compared to an RNA alphabet derived from thieno[3,4-d]-pyrimidine. The restoration of the nitrogen in a position equivalent to the purines' N7 leads to "isofunctional" behavior, as illustrated by the ability of adenosine deaminase to deaminate (tz)A as effectively as adenosine, the native substrate.

Chemical Mutagenesis of an Emissive RNA Alphabet