Cited by 114RNA Research and SplicingRNA regulation and diseaseNuclear Structure and Function

Exo- and Endoribonucleolytic Activities of Yeast Cytoplasmic and Nuclear RNA Exosomes Are Dependent on the Noncatalytic Core and Central Channel

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Wasmuth, Elizabeth V., Lima, Christopher D.·2012·Molecular Cell

Abstract

The RNA exosome is an essential multisubunit ribonuclease (RNase) that contributes to cytoplasmic and nuclear RNA decay and quality control. The 9-subunit exosome core (Exo9) features a prominent central channel formed by stacked asymmetric rings of six RNase PH-like proteins and three S1/KH domain proteins. Exo9 is catalytically inert but associates with Rrp44, an endoribonuclease and processive 3'→5' exoribonuclease, and Rrp6, a distributive 3'→5' exoribonuclease. We show that Exo9 and its central channel modulate all three yeast exosome RNase activities because channel occlusion attenuates RNA binding and RNase activities in vitro and fails to complement exosome functions in vivo. We find that Rrp6 stimulates Rrp44 RNase activities and that Rrp6 is inhibited by a mutation in the Rrp44 exoribonuclease active site in 11-subunit nuclear exosomes. These results suggest the exosome core and central channel is essential because it modulates each of the known RNase activities of the yeast RNA exosome.

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Crossref · 10.1016/j.molcel.2012.07.012

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  • Catalytic activities of the RNA exosome are mediated by associated 3'−5' exonucleases EXOSC10 and DIS3 or accessory factors such as MTR4, while core components including EXOSC3 provide structural stability and facilitate substrate recognition and/or RNA threading.

    “The catalytic activities of the RNA exosome are mediated by associated 3’−5’ exonucleases EXOSC10 and DIS3 or accessory factors such as the RNA helicase MTR4, while core components including EXOSC3 provide structural stability and facilitate substrate recognition and/or RNA threading through the protein complex core39–43.”

    From EXOSC3 G191 Variants Trigger System-Wide Recalibration of RNA Processing Machinery (2026) · cites this paper as [43]

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Authors
Wasmuth, E. V., & Lima, C. D.
Affiliations
Memorial Sloan Kettering Cancer Center (US)
Corresponding author
Lima, Christopher D.
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2012-10
Volume
48
Issue
1
Pages
133-144
ISSN
1097-2765 (ISSN-L)
OpenAlex
W2002448576
Cited by
114
References
44
Citations by year
2026: 3 · 2025: 3 · 2024: 3 · 2023: 7 · 2022: 6 · 2021: 7 · 2020: 8 · 2019: 10 · 2018: 11 · 2017: 10 · 2016: 11 · 2015: 4 · 2014: 10 · 2013: 18 · 2012: 3
FWCI
4.50
Type
journal article
Language
en
Open access
Locations
  • Molecular Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health
  • National Institute of General Medical Sciences (R01GM079196, F31GM097910)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Research and Splicing
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA regulation and disease
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nuclear Structure and Function
Keywords
RNA exosome, central channel, Rrp6, endoribonuclease activity, 3'-5' exoribonuclease, RNA degradation, RNA quality control, RNA binding
MeSH terms
Cell Nucleus, Cytoplasm, Endoribonucleases, Exoribonucleases, Models, Molecular, Mutation, Recombinant Proteins, RNA, Fungal, Saccharomyces cerevisiae, Catalytic Domain, Protein Subunits, Saccharomyces cerevisiae Proteins, Exosome Multienzyme Ribonuclease Complex

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