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. 1976 Jun;73(6):1994–1998. doi: 10.1073/pnas.73.6.1994

Size of primary transcripts in Ehrlich ascites cells as measured by tetraphosphate determination.

C D Schmincke, K Herrmann, P Hausen
PMCID: PMC430434  PMID: 1064868

Abstract

A method for the quantitation of 5"-tetraphosphate ends in 32P-labeled RNA has been developed. The tetraphosphate content of different RNA fractions obtained from Ehrlich ascites cells labeled with 32P for different lengths of time has been determined. Ribosomal RNA and poly(U)-binding RNA, labeled for long periods, (mRNA) lack 5'-terminal tetraphosphate. 5S RNA, pulse labeled 4-5S RNA, and poly(U)-binding hnRNA (heterogeneous nuclear RNA) do contain tetraphosphate. From the amount of the tetraphosphate, molecular weight data can be calculated for these RNA fractions which agree with independent determinations by denaturing gel electrophoresis. The results demonstrate that the majority of the poly(A) containing hnRNA molecules are small (less than 28S) and contain the tetraphosphate of the primary transcript. Therefore, they do not originate from the 3'-end of large molecules by processing events.

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1994

Selected References

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