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- W1853462688 abstract "In in vitro splicing reactions, influenza virus NS1 mRNA was not detectably spliced, but nonetheless very efficiently formed ATP-dependent 55S complexes containing the U1, U2, U4, U5, and U6 small nuclear ribonucleoproteins (snRNPs) (C. H. Agris, M. E. Nemeroff, and R. M. Krug, Mol. Cell. Biol. 9:259-267, 1989). We demonstrate that the block in splicing was caused by two regions in NS1 mRNA: (i) a large intron region (not including the branchpoint sequence) and (ii) an 85-nucleotide 3' exon region near the 3' end of the exon. After removal of both of these regions, the 5' and 3' splice sites and branchpoint of NS1 mRNA functioned efficiently in splicing, indicating that they were not defective. The two inhibitory regions shared one property: splicing inhibition was independent of the identity of the nucleotide sequence in either region. In other respects, however, the two inhibitory regions differed. The inhibitory activity of the intron region was proportional to its length, indicating that the inhibition was probably due to size only. In contrast, the 3' exon, which was of small size, was a context element; i.e., it functioned only when it was located at a specific position in the 3' exon of NS1 mRNA. To determine how these intron and exon regions inhibited splicing, we compared the types of splicing complexes formed by intact NS1 mRNA with those formed by spliceable NS1 mRNA lacking the intron and exon regions. Splicing complexes were formed by using purified splicing factors.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W1853462688 date "1992-03-01" @default.
- W1853462688 modified "2023-09-26" @default.
- W1853462688 title "Identification of cis-acting intron and exon regions in influenza virus NS1 mRNA that inhibit splicing and cause the formation of aberrantly sedimenting presplicing complexes." @default.
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- W1853462688 doi "https://doi.org/10.1128/mcb.12.3.962" @default.
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