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Mol Cell. 2014 Aug 7;55(3):467-81. doi: 10.1016/j.molcel.2014.05.031. Epub 2014 Jul 24.

Molecular basis for coordinating transcription termination with noncoding RNA degradation.

Author information

1
Centre de Génétique Moléculaire, CNRS UPR3404, 91190 Gif sur Yvette, France.
2
Centre de Génétique Moléculaire, CNRS UPR3404, 91190 Gif sur Yvette, France. Electronic address: porrua@ijm.univ-paris-diderot.fr.
3
CEITEC-Central European Institute of Technology, Masaryk University, Brno 62500, Czech Republic; National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Brno 62500, Czech Republic.
4
Gene Center Munich and Department of Biochemistry, Center for Integrated Protein Science CIPSM, Ludwig-Maximilians-Universität München, 81377 Munich, Germany.
5
CEITEC-Central European Institute of Technology, Masaryk University, Brno 62500, Czech Republic; National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Brno 62500, Czech Republic. Electronic address: richard.stefl@ceitec.muni.cz.
6
Centre de Génétique Moléculaire, CNRS UPR3404, 91190 Gif sur Yvette, France. Electronic address: libri.domenico@ijm.univ-paris-diderot.fr.

Abstract

The Nrd1-Nab3-Sen1 (NNS) complex is essential for controlling pervasive transcription and generating sn/snoRNAs in S. cerevisiae. The NNS complex terminates transcription of noncoding RNA genes and promotes exosome-dependent processing/degradation of the released transcripts. The Trf4-Air2-Mtr4 (TRAMP) complex polyadenylates NNS target RNAs and favors their degradation. NNS-dependent termination and degradation are coupled, but the mechanism underlying this coupling remains enigmatic. Here we provide structural and functional evidence demonstrating that the same domain of Nrd1p interacts with RNA polymerase II and Trf4p in a mutually exclusive manner, thus defining two alternative forms of the NNS complex, one involved in termination and the other in degradation. We show that the Nrd1-Trf4 interaction is required for optimal exosome activity in vivo and for the stimulation of polyadenylation of NNS targets by TRAMP in vitro. We propose that transcription termination and RNA degradation are coordinated by switching between two alternative partners of the NNS complex.

PMID:
25066235
PMCID:
PMC4186968
DOI:
10.1016/j.molcel.2014.05.031
[Indexed for MEDLINE]
Free PMC Article
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