Title
Identification of karyopherins involved in the nuclear import of RNA exosome subunit Rrp6 in Saccharomyces cerevisiae
Date Issued
21 July 2017
Access level
open access
Resource Type
journal article
Author(s)
University of São Paulo
Publisher(s)
American Society for Biochemistry and Molecular Biology Inc.
Abstract
The exosome is a conserved multiprotein complex essential for RNA processing and degradation. The nuclear exosome is a key factor for pre-rRNA processing through the activity of its catalytic subunits, Rrp6 and Rrp44. In Saccharomyces cerevisiae, Rrp6 is exclusively nuclear and has been shown to interact with exosome cofactors. With the aim of analyzing proteins associated with the nuclear exosome, in this work, we purified the complex with Rrp6-TAP, identified the co-purified proteins by mass spectrometry, and found karyopherins to be one of the major groups of proteins enriched in the samples. By investigating the biological importance of these protein interactions, we identified Srp1, Kap95, and Sxm1 as the most important karyopherins for Rrp6 nuclear import and the nuclear localization signals recognized by them. Based on the results shown here, we propose a model of multiple pathways for the transport of Rrp6 to the nucleus.
Start page
12267
End page
12284
Volume
292
Issue
29
Language
English
OCDE Knowledge area
BioquÃmica, BiologÃa molecular
BiologÃa celular, MicrobiologÃa
Scopus EID
2-s2.0-85025121755
PubMed ID
Source
Journal of Biological Chemistry
ISSN of the container
00219258
DOI of the container
10.1074/jbc.M116.772376
Source funding
Fundação de Amparo à Pesquisa do Estado de São Paulo
Laboratório Nacional de Biociências
Sponsor(s)
This work was supported in part by Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Grants 10/51842-3 and 15/06477-9 (to C. C. O.). The authors declare that they have no conflicts of interest with the contents of this article. Supported by FAPESP Postdoctoral Fellowship 2012/50196-6. We thank all the members of the Oliveira laboratory, especially Bruna F. Rech, for help with cloning and Western blotting and Fiorella Orellana-Peralta, Felipe F. M. Bagatelli, and M. Griselda Perona for reagents and discussions. We thank Frederico Gueiros Filho, members of his laboratory, and Glaucia M. Machado-Santelli for the use of fluorescence microscopes, reagents, and helpful suggestions. We also thank the Brazilian Biosciences National Laboratory (LNBio) for some of the analysis of proteins by mass spectrometry.
Sources of information:
Directorio de Producción CientÃfica
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