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Nucleolar localization of the yeast RNA exosome subunit Rrp44 hints at early pre-rRNA processing as its main function.
Okuda, Ellen K; Gonzales-Zubiate, Fernando A; Gadal, Olivier; Oliveira, Carla C.
Afiliação
  • Okuda EK; Department of Biochemistry, Institute of Chemistry, University of São Paulo, São Paulo, Brazil.
  • Gonzales-Zubiate FA; Department of Biochemistry, Institute of Chemistry, University of São Paulo, São Paulo, Brazil.
  • Gadal O; Laboratoire de Biologie Moléculaire Eucaryote, Centre de Biologie Intégrative (CBI), Université de Toulouse, CNRS, UPS, Toulouse, France.
  • Oliveira CC; Department of Biochemistry, Institute of Chemistry, University of São Paulo, São Paulo, Brazil ccoliv@iq.usp.br.
J Biol Chem ; 295(32): 11195-11213, 2020 08 07.
Article em En | MEDLINE | ID: mdl-32554806
The RNA exosome is a multisubunit protein complex involved in RNA surveillance of all classes of RNA, and is essential for pre-rRNA processing. The exosome is conserved throughout evolution, present in archaea and eukaryotes from yeast to humans, where it localizes to the nucleus and cytoplasm. The catalytically active subunit Rrp44/Dis3 of the exosome in budding yeast (Saccharomyces cerevisiae) is considered a protein present in these two subcellular compartments, and here we report that it not only localizes mainly to the nucleus, but is concentrated in the nucleolus, where the early pre-rRNA processing reactions take place. Moreover, we show by confocal microscopy analysis that the core exosome subunits Rrp41 and Rrp43 also localize largely to the nucleus and strongly accumulate in the nucleolus. These results shown here shed additional light on the localization of the yeast exosome and have implications regarding the main function of this RNase complex, which seems to be primarily in early pre-rRNA processing and surveillance.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Saccharomyces cerevisiae / RNA Fúngico / RNA de Transferência / Precursores de RNA / Nucléolo Celular / Processamento Pós-Transcricional do RNA / Proteínas de Saccharomyces cerevisiae / Exossomos / Complexo Multienzimático de Ribonucleases do Exossomo Idioma: En Revista: J Biol Chem Ano de publicação: 2020 Tipo de documento: Article País de afiliação: Brasil País de publicação: Estados Unidos
Texto completo
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Saccharomyces cerevisiae / RNA Fúngico / RNA de Transferência / Precursores de RNA / Nucléolo Celular / Processamento Pós-Transcricional do RNA / Proteínas de Saccharomyces cerevisiae / Exossomos / Complexo Multienzimático de Ribonucleases do Exossomo Idioma: En Revista: J Biol Chem Ano de publicação: 2020 Tipo de documento: Article País de afiliação: Brasil País de publicação: Estados Unidos