原始出处:
Molecular Cell, Vol 27, 262-274, 20 July 2007
Article
Systematic Analysis of the Protein Interaction Network for the Human Transcription Machinery Reveals the Identity of the 7SK Capping Enzyme
1 Laboratory of Gene Transcription and Proteomics Discovery Platform, Institut de recherches cliniques de Montréal, 110 avenue des Pins Ouest, Montréal, QC H2W 1R7, Canada
2 Biochemistry Department, University of Iowa, Iowa City, IA 52242-1109, USA
3 Banting and Best Department of Medical Research, University of Toronto, Toronto, ON M5G 1L6, Canada
4 Centre hospitalier universitaire de Québec, Université Laval, Québec, QC G1V 4G2, Canada
5 Département de microbiologie et infectiologie, Université de Sherbrooke, Sherbrooke, QC J1H 5N4, Canada
6 McGill Centre for Bioinformatics, McGill University, Montréal, QC H3A 2B4, Canada
Corresponding author
Benoit Coulombe
benoit.coulombe@ircm.qc.ca
We have performed a survey of soluble human protein complexes containing components of the transcription and RNA processing machineries using protein affinity purification coupled to mass spectrometry. Thirty-two tagged polypeptides yielded a network of 805 high-confidence interactions. Remarkably, the network is significantly enriched in proteins that regulate the formation of protein complexes, including a number of previously uncharacterized proteins for which we have inferred functions. The RNA polymerase II (RNAP II)-associated proteins (RPAPs) are physically and functionally associated with RNAP II, forming an interface between the enzyme and chaperone/scaffolding proteins. BCDIN3 is the 7SK snRNA methylphosphate capping enzyme (MePCE) present in an snRNP complex containing both RNA processing and transcription factors, including the elongation factor P-TEFb. Our results define a high-density protein interaction network for the mammalian transcription machinery and uncover multiple regulatory factors that target the transcription machinery.
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