Targeted snRNP depletion reveals an additional role for mammalian U1 snRNP in spliceosome assembly

Silvia M.L. Barabino, Benjamin J. Blencowe, Ursula Ryder, Brian S. Sproat, Angus I. Lamond

    Research output: Contribution to journalArticlepeer-review

    124 Citations (Scopus)

    Abstract

    HeLa cell nuclear splicing extracts have been prepared that are specifically and efficiently depleted of U1, U2, or U4 U6 snRNPs by antisense affinity chromatography using biotinylated 2′-OMe RNA oligonucleotides. Removal of each snRNP particle prevents pre-mRNA splicing but arrests spliceosome formation at different stages of assembly. Mixing extracts depleted for different snRNP particles restores formation of functional splicing complexes. Specific binding of factors to the 3′ splice site region is still detected in snRNP-depleted extracts. Depletion of U1 snRNP impairs stable binding of U2 snRNP to the pre-mRNA branch site. This role of U1 snRNP in promoting stable presplicing complex formation is independent of the U1 snRNA-5′ splice site interaction.

    Original languageEnglish
    Pages (from-to)293-302
    Number of pages10
    JournalCell
    Volume63
    Issue number2
    DOIs
    Publication statusPublished - 19 Oct 1990

    ASJC Scopus subject areas

    • General Biochemistry,Genetics and Molecular Biology

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