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. 1986 Mar;57(3):1155–1158. doi: 10.1128/jvi.57.3.1155-1158.1986

Adenovirus mutants with splice-enhancing mutations in the E3 complex transcription unit are also defective in E3A RNA 3'-end formation.

B M Bhat, W S Wold
PMCID: PMC252851  PMID: 3951016

Abstract

Region E3 of adenovirus encodes about 10 overlapping mRNAs with different spliced structures. The mRNAs are 5' coterminal and form two major 3'-coterminal families termed E3A and E3B. As a group, the mRNAs have two 5' splice sites and four or five 3' splice sites. We previously described a novel class of virus mutants with deletions that enhance distant upstream and downstream 5' and 3' splice sites in region E3 (S. L. Deutscher, B. M. Bhat, M. H. Pursley, C. Cladaras, and W. S. M. Wold, Nucleic Acids Res. 13:5771-5788, 1985). We now report that two of these mutants, dl710 and dl712, are defective in RNA 3'-end formation at the E3A site. This result was surprising because the deletions in dl710 and dl712 are upstream of the putative signal for E3A RNA 3'-end formation. The explanation that we favor for this result is that the enhanced splicing activity in these mutants results in the splicing out of the E3A 3'-end site from the RNA precursor before the E3A 3' ends have a chance to form.

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Selected References

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