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- W1968045961 abstract "ABSTRACT The Rous sarcoma virus gag gene contains a cis -acting negative regulator of splicing (NRS) element that is implicated in viral polyadenylation regulation. To study the mechanism of polyadenylation promotion at the viral poly(A) site located over 8 kb downstream, we performed in vitro polyadenylation analysis. RNA containing only the poly(A) site and flanking sequences in the 3′ long terminal repeat (LTR) was not polyadenylated detectably in vitro; however, if the transcript contained the NRS upstream of the LTR, polyadenylation was observed. Insertion of the viral env 3′ splice site sequence between the NRS and the LTR did not alter the level of polyadenylation appreciably. We conclude that the NRS promotes polyadenylation in vitro and can do so without formation of a splicing complex with a 3′ splice site. We then explored the roles of several cellular factors in NRS-mediated polyadenylation. Mutation of the binding sites of U1 and U11 snRNPs to the NRS did not affect polyadenylation, whereas hnRNP H strongly inhibited polyadenylation. We propose a model in which hnRNP H and SR proteins compete for binding to the NRS. Bound SR proteins may bridge between the NRS and the 3′ LTR and aid in the recruitment of the 3′-end processing machinery." @default.
- W1968045961 created "2016-06-24" @default.
- W1968045961 creator A5055919781 @default.
- W1968045961 creator A5061833373 @default.
- W1968045961 date "2006-10-01" @default.
- W1968045961 modified "2023-10-16" @default.
- W1968045961 title "The Negative Regulator of Splicing Element of Rous Sarcoma Virus Promotes Polyadenylation" @default.
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- W1968045961 doi "https://doi.org/10.1128/jvi.00845-06" @default.
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