2'-O-methylation of adenosine, guanosine, uridine, and cytidine in RNA of isolated rat liver nuclei.

Nuclei isolated from rat liver, when incubated with methyl-labeled S-adenosylmethionine, incorporated label into 2'-O-methyladenosine, 2'-O-methylguanosine, 2'-O-methyluridine, and 2'-O-methylcytidine of endogenous nuclear RNA. Addition of ribosomal RNA from wheat germ to the reaction markedly stimulated 2'-O-methylation of total RNA. The relative incorporation of label into the four different 2'-O-methyl ribonucleosides was greatly changed by the addition of wheat germ RNA. There was much more 2'-O-methylation of the purine ribonucleosides, relative to the pyrimidine ribonucleosides, in the reaction stimulated by wheat germ RNA.