Methylated, blocked 5 termini in HeLa cell mRNA - PubMed (original) (raw)
Methylated, blocked 5 termini in HeLa cell mRNA
Y Furuichi et al. Proc Natl Acad Sci U S A. 1975 May.
Abstract
Poly(A)-containing HeLa cell mRNA prepared from cells labeled with [methyl-(3)H]methionine or [(32)P]phosphate was found to contain a variety of methylated, blocked 5'-terminal structures of two general types: m(7)GpppN(7)-Np and m(7)GpppN(m)-N(m)-Np. In addition, about one-third of the [(3)H]methyl label was present in the N(6)-methyladenosine; this labeled nucleoside was not found in the 3'-terminal one-third of the mRNA chain and thus may also be in the 5' portion of the mRNA.
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