Synthesis and Reactions of Nucleoside 5‘-Diphosphate Imidazolide. A Nonenzymatic Capping Agent for 5‘-Monophosphorylated Oligoribonucleotides in Aqueous Solution
We have synthesized adenosine and 7-methylguanosine 5'-diphosphate imidazolides from imidazole and the corresponding nucleoside 5'-diphosphates. The phosphorimidazolide bond of the compounds was susceptible to hydrolysis and hydrolyzed gradually in neutral aqueous solution, but it was more stable than that of the corresponding imidazolides of nucleoside 5'-monophosphate. The 7-methylguanosine 5'-diphosphate imidazolide reacted with guanosine 5'-monophosphate or 5'-monophosphorylated oligoribonucleotides in neutral aqueous solution in the presence of an Mn2+ ion catalyst converting to the cap portion of mRNA or the capped m7Gppp-oligoribonucleotides in substantial yields. The condensation reaction of adenosine 5'-diphosphate imidazolide with adenosine 5'-monophosphate took place similarly in neutral aqueous solution by a divalent metal ion-catalyst such as Mg2+ or Mn2+, yielding diadenosine 5',5'-triphosphate.
SEKINE, MITSUO;IWASE, REIKO;HATA, TSUJIAKI;MIURA, KIN-ICHIRO, J. CHEM. SOC. PERKIN TRANS. PT 1,(1989) N, C. 969-978