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JBC, Vol. 251, Issue 10, 2898-2904, May, 1976

Methylated, blocked 5' termini of yeast mRNA

C. E. Sripati, Y. Groner and J. R. Warner

mRNAs of the yeast, Saccharomyces cerevisiae, have modified 5' termini similar but not identical with those present in the higher eukaryotes. Poly(A)-containing RNA isolated from spheroplasts or from polysomes of cells labeled with [methyl-3H]methoionine or 32Pi contain methylated, blocked 5'-terminal structures of composition: m7G(5')pppAp and m7G(5')pppGp, occurring in a relative distribution of 75% and 25%, respectively. Furthermore there is no N6-methyladenosine nor any other methylated nucleoside in the entire molecule of poly(A)-containing RNA. Experiments with a mutant, temperature-sensitive for the transport of mRNA to cytoplasm, suggest that the methylation and addition of the blocking group take place in the nucleus and that the genetic lesion in the mutant does not affect these mechanisms.
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