title: Chemical Mutagenesis of an Emissive RNA Alphabet.
abstract: 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.
authors.affiliation: Department of Chemistry and Biochemistry, University of California, San Diego , La Jolla, California 92093-0358, United States.
authors.forename: Alexander R
authors.initials: AR
authors.lastname: Rovira
authors.affiliation: Department of Chemistry and Biochemistry, University of California, San Diego , La Jolla, California 92093-0358, United States.
authors.forename: Andrea
authors.initials: A
authors.lastname: Fin
authors.affiliation: Department of Chemistry and Biochemistry, University of California, San Diego , La Jolla, California 92093-0358, United States.
authors.forename: Yitzhak
authors.initials: Y
authors.lastname: Tor
mesh_terms: D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D009690:Nucleic Acid Conformation; D012313:RNA / Q000737:chemistry*
chemical_list: D012313:RNA