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    Cell. 2005 Oct 21;123(2):265-76.

    Integrator, a multiprotein mediator of small nuclear RNA processing, associates with the C-terminal repeat of RNA polymerase II.

    Baillat D, Hakimi MA, Näär AM, Shilatifard A, Cooch N, Shiekhattar R.

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    The Wistar Institute, 3601 Spruce Street, Philadelphia, Pennsylvania 19104, USA.

    Abstract

    The C-terminal domain (CTD) of RNA polymerase II (RNAPII) is an essential component of transcriptional regulation and RNA processing of protein-coding genes. A large body of data also implicates the CTD in the transcription and processing of RNAPII-mediated small nuclear RNAs (snRNAs). However, the identity of the complex (or complexes) that associates with the CTD and mediates the processing of snRNAs has remained elusive. Here, we describe an RNA polymerase II complex that contains at least 12 novel subunits, termed the Integrator, in addition to core RNAPII subunits. Two of the Integrator subunits display similarities to the subunits of the cleavage and polyadenylation specificity factor (CPSF) complex. We show that Integrator is recruited to the U1 and U2 snRNA genes and mediates the snRNAs' 3' end processing. The Integrator complex is evolutionarily conserved in metazoans and directly interacts with the C-terminal domain of the RNA polymerase II largest subunit.

    PMID:
    16239144
    [PubMed - indexed for MEDLINE]

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