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Proteomic analysis of in vivo-assembled pre-mRNA splicing complexes expands the catalog of participating factors.

Authors: Chen, YI  Moore, RE  Ge, HY  Young, MK  Lee, TD  Stevens, SW 
Citation: Chen YI, etal., Nucleic Acids Res. 2007;35(12):3928-44. Epub 2007 May 30.
Pubmed: (View Article at PubMed) PMID:17537823
DOI: Full-text: DOI:10.1093/nar/gkm347

Previous compositional studies of pre-mRNA processing complexes have been performed in vitro on synthetic pre-mRNAs containing a single intron. To provide a more comprehensive list of polypeptides associated with the pre-mRNA splicing apparatus, we have determined the composition of the bulk pre-mRNA processing machinery in living cells. We purified endogenous nuclear pre-mRNA processing complexes from human and chicken cells comprising the massive (>200S) supraspliceosomes (a.k.a. polyspliceosomes). As expected, RNA components include a heterogeneous mixture of pre-mRNAs and the five spliceosomal snRNAs. In addition to known pre-mRNA splicing factors, 5' end binding factors, 3' end processing factors, mRNA export factors, hnRNPs and other RNA binding proteins, the protein components identified by mass spectrometry include RNA adenosine deaminases and several novel factors. Intriguingly, our purified supraspliceosomes also contain a number of structural proteins, nucleoporins, chromatin remodeling factors and several novel proteins that were absent from splicing complexes assembled in vitro. These in vivo analyses bring the total number of factors associated with pre-mRNA to well over 300, and represent the most comprehensive analysis of the pre-mRNA processing machinery to date.

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CRRD Object Information
CRRD ID: 9686091
Created: 2015-01-30
Species: All species
Last Modified: 2015-01-30
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.