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. 1994 Jan 25;22(2):222–231. doi: 10.1093/nar/22.2.222

Upstream and downstream cis-acting elements for cleavage at the L4 polyadenylation site of adenovirus-2.

A Sittler 1, H Gallinaro 1, M Jacob 1
PMCID: PMC307775  PMID: 8121807

Abstract

A study of the cis-acting elements involved in the 3' end formation of the RNAs from the major late L4 family of adenovirus-2 was undertaken. Series of 5' or 3' end deletion mutants and mutants harboring either internal deletions or substitutions were prepared and assayed for in vitro cleavage. This first allowed the demonstration of a sequence, located at -6 to -29, relative to AAUAAA, whose deletion or substitution reduces cleavage efficiency at the L4 polyadenylation site two to three fold. This upstream efficiency element 5' AUCUUUGUUGUC/AUCUCUGUGCUG 3' is constituted of a partially repeated 12 nucleotide long, UCG rich sequence. The activities of the 2 sequence elements in cleavage are additive. We also searched for regulatory sequences downstream of the L4 polyadenylation site. We found that the deletion or substitution of a 30 nucleotide long UCG rich sequence, between nucleotides +7 and +35 relative to the cleavage site and harboring a UCCUGU repeat reduces cleavage efficiency at least ten fold. A GUUUUU sequence, starting at +35 had no influence. Thus, the usage of the L4 polyadenylation site requires down-stream sequences different from the canonical GU or U boxes and is regulated by upstream sequence elements.

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Selected References

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