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. 1986 Feb;83(4):927–931. doi: 10.1073/pnas.83.4.927

Inhibition of splicing but not cleavage at the 5' splice site by truncating human beta-globin pre-mRNA.

P J Furdon, R Kole
PMCID: PMC322983  PMID: 2937057

Abstract

Human beta-globin mRNAs truncated in the second exon or in the first intron have been processed in vitro in a HeLa cell nuclear extract. Transcripts containing a fragment of the second exon as short as 53 nucleotides are efficiently spliced, whereas transcripts truncated 24 or 14 nucleotides downstream from the 3' splice site are spliced inefficiently, if at all. All of these transcripts, however, are efficiently and accurately cleaved at the 5' splice site. In contrast, RNA truncated in the first intron, 54 nucleotides upstream from the 3' splice site, is not processed at all. These findings suggest that cleavage at the 5' splice site and subsequent splicing steps--i.e., cleavage at the 3' splice site and exon ligation--need not be coupled. Anti-Sm serum inhibits the complete splicing reaction and cleavage at the 5' splice site, suggesting involvement of certain ribonucleoprotein particles in the cleavage reaction. ATP and Mg2+ are required for cleavage at the 5' splice site at concentrations similar to those for the complete splicing reaction.

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