The human cap-binding complex is functionally connected to the nuclear RNA exosome

Peter Refsing Andersen, Michal Domanski, Maiken Søndergaard Kristiansen, Helena Storvall, Evgenia Ntini, Celine Verheggen, Aleks Schein, Jakob Bunkenborg, Ina Poser, Marie Hallais, Rickard Sandberg, Anthony Hyman, John Lacava, Michael P Rout, Jens S. Andersen, Edouard Bertrand, Torben Heick Jensen

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Abstrakt

Nuclear processing and quality control of eukaryotic RNA is mediated by the RNA exosome, which is regulated by accessory factors. However, the mechanism of exosome recruitment to its ribonucleoprotein (RNP) targets remains poorly understood. Here we report a physical link between the human exosome and the cap-binding complex (CBC). The CBC associates with the ARS2 protein to form CBC-ARS2 (CBCA) and then further connects, together with the ZC3H18 protein, to the nuclear exosome targeting (NEXT) complex, thus forming CBC-NEXT (CBCN). RNA immunoprecipitation using CBCN factors as well as the analysis of combinatorial depletion of CBCN and exosome components underscore the functional relevance of CBC-exosome bridging at the level of target RNA. Specifically, CBCA suppresses read-through products of several RNA families by promoting their transcriptional termination. We suggest that the RNP 5' cap links transcription termination to exosomal RNA degradation through CBCN.
OriginalsprogEngelsk
TidsskriftNature Structural and Molecular Biology
Vol/bind20
Udgave nummer12
Sider (fra-til)1367-1376
ISSN1545-9993
DOI
StatusUdgivet - 2013

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