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. 1977 Oct;4(10):3357–3369. doi: 10.1093/nar/4.10.3357

5' Caps in hnRNA: absence of m32,2,7G and size distribution of capped molecules.

R Fernandez-Munoz, U Lavi, J E Darnell
PMCID: PMC342658  PMID: 928063

Abstract

In HeLa cells the "small nuclear" RNA has a cap II 5' structure (8)-- m32,2,7G(5') pppXmpYmp-- where X and Y are 2'0 methylated adenosine and uridine. In contrast hnRNA contains only cap I structures were the 2'0 methylated residue may be any base as was earlier reported for cytoplasmic mRNA (8,9,11). With a clear distinction between the source of these two caps an analysis of the size distribution of capped hnRNA could be performed which revealed over 65% of the capped hnRNA molecules were larger than cytoplasmic mRNA.

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Selected References

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