title: The nuclear exosome contributes to autogenous control of NAB2 mRNA levels.
abstract: The RNA-processing exosome is a complex of riboexonucleases required for 3'-end formation of some noncoding RNAs and for the degradation of mRNAs in eukaryotes. The nuclear form of the exosome functions in an mRNA surveillance pathway that retains and degrades improperly processed precursor mRNAs within the nucleus. We report here that the nuclear exosome controls the level of NAB2 mRNA, encoding the nuclear poly(A)+-RNA-binding protein Nab2p. Mutations affecting the activity of the nuclear, but not the cytoplasmic, exosome cause an increase in the amount of NAB2 mRNA. Cis- and trans-acting mutations that inhibit degradation by the nuclear-exosome subunit Rrp6p result in elevated levels of NAB2 mRNA. Control of NAB2 mRNA levels occurs posttranscriptionally and requires a sequence of 26 consecutive adenosines (A26) in the NAB2 3' untranslated region, which represses NAB2 3'-end formation and sensitizes the transcript to degradation by Rrp6p. Analysis of NAB2 mRNA levels in a nab2-1 mutant and in the presence of excess Nab2p indicates that Nab2p activity negatively controls NAB2 mRNA levels in an A26- and Rrp6p-dependent manner. These findings suggest a novel regulatory circuit in which the nuclear exosome controls the level of NAB2 mRNA in response to changes in the activity of Nab2 protein.
authors.affiliation: Department of Microbiology and Immunology, University of Rochester School of Medicine and Dentistry, Box 672, 601 Elmwood Ave., Rochester, NY 14642, USA.
authors.forename: Kelly M
authors.initials: KM
authors.lastname: Roth
authors.forename: Maria K
authors.initials: MK
authors.lastname: Wolf
authors.forename: Marie
authors.initials: M
authors.lastname: Rossi
authors.forename: J Scott
authors.initials: JS
authors.lastname: Butler
mesh_terms: D020413:3' Untranslated Regions / Q000235:genetics / Q000378:metabolism; D001483:Base Sequence; D002467:Cell Nucleus / Q000378:metabolism; D005095:Exoribonucleases / Q000235:genetics / Q000502:physiology*; D063326:Exosome Multienzyme Ribonuclease Complex; D015870:Gene Expression / Q000235:genetics; D015966:Gene Expression Regulation, Fungal; D008969:Molecular Sequence Data; D009154:Mutation / Q000235:genetics; D029543:Nucleocytoplasmic Transport Proteins / Q000235:genetics* / Q000502:physiology; D011061:Poly A / Q000235:genetics / Q000378:metabolism; D039102:Poly(A)-Binding Proteins / Q000378:metabolism; D012323:RNA Processing, Post-Transcriptional / Q000235:genetics*; D020871:RNA Stability; D012331:RNA, Fungal / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism*; D016601:RNA-Binding Proteins / Q000235:genetics* / Q000502:physiology; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism / Q000502:physiology; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics* / Q000502:physiology*
chemical_list: D020413:3' Untranslated Regions; C080773:NAB2 protein, S cerevisiae; D029543:Nucleocytoplasmic Transport Proteins; D039102:Poly(A)-Binding Proteins; D012331:RNA, Fungal; D012333:RNA, Messenger; D016601:RNA-Binding Proteins; D029701:Saccharomyces cerevisiae Proteins; D011061:Poly A; D005095:Exoribonucleases; D063326:Exosome Multienzyme Ribonuclease Complex; C112610:RRP6 protein, S cerevisiae