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Cited by 460

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Interaction Profiling Identifies the Human Nuclear Exosome Targeting Complex

Lubas, Michal, Christensen, Marianne S., Kristiansen, Maiken S., Domanski, Michal, Falkenby, Lasse G., Lykke-Andersen, Søren, Andersen, Jens S., Dziembowski, Andrzej, Jensen, Torben Heick·2011·Molecular Cell
DOI 10.1016/j.molcel.2011.06.028
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Abstract

The RNA exosome is a conserved degradation machinery, which obtains full activity only when associated with cofactors. The most prominent activator of the yeast nuclear exosome is the RNA helicase Mtr4p, acting in the context of the Trf4p/Air2p/Mtr4p polyadenylation (TRAMP) complex. The existence of a similar activator(s) in humans remains elusive. By establishing an interaction network of the human nuclear exosome, we identify the trimeric Nuclear Exosome Targeting (NEXT) complex, containing hMTR4, the Zn-knuckle protein ZCCHC8, and the putative RNA binding protein RBM7. ZCCHC8 and RBM7 are excluded from nucleoli, and consistently NEXT is specifically required for the exosomal degradation of promoter upstream transcripts (PROMPTs). We also detect putative homolog TRAMP subunits hTRF4-2 (Trf4p) and ZCCHC7 (Air2p) in hRRP6 and hMTR4 precipitates. However, at least ZCCHC7 function is restricted to nucleoli. Our results suggest that human nuclear exosome degradation pathways comprise modules of spatially organized cofactors that diverge from the yeast model.

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Metadata

Authors
Lubas, M., Christensen, M. S., Kristiansen, M. S., Domanski, M., Falkenby, L. G., Lykke-Andersen, S., Andersen, J. S., Dziembowski, A., & Jensen, T. H.
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2011-08
Volume
43
Issue
4
Pages
624-637
ISSN
1097-2765
DOI
10.1016/j.molcel.2011.06.028
Cited by
460
References
2
Language
en
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