| Literature DB >> 3644239 |
E Patzelt, E Thalmann, K Hartmuth, D Blaas, E Kuechler.
Abstract
To study the influence of the ubiquitous cap structure of nuclear pre-mRNAs on the assembly of a functional splicing complex, the in vitro splicing of a truncated human metallothionein pre-mRNA was examined in the presence of the cap analogue m7GTP. Significant inhibition of splicing was observed at a concentration as low as 5 microM m7GTP. Analysis of the splicing reaction on glycerol density gradients showed two complexes sedimenting at 45S and 22S. When the reaction was carried out in presence of m7GTP a marked decrease of the material sedimenting at 45S, representing the active splicing complex, was observed. When capped pre-mRNA was replaced by uncapped pre-mRNA, complex formation was significantly reduced. These data indicate that the cap structure plays an important yet unknown role in the assembly of spliceosomes.Entities:
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Year: 1987 PMID: 3644239 PMCID: PMC340556 DOI: 10.1093/nar/15.4.1387
Source DB: PubMed Journal: Nucleic Acids Res ISSN: 0305-1048 Impact factor: 16.971