Display Settings:

Format

Send to:

Choose Destination
We are sorry, but NCBI web applications do not support your browser and may not function properly. More information
Nat Struct Mol Biol. 2007 Jan;14(1):15-22. Epub 2006 Dec 17.

A single subunit, Dis3, is essentially responsible for yeast exosome core activity.

Author information

  • 1Equipe labellisée La Ligue, Centre de Genetique Moleculaire, Centre National de la Recherche Scientifique UPR2167, associée à l'Université Pierre et Marie Curie, Avenue de la Terrasse, 91198 Gif sur Yvette Cedex, France. andrzejd@ibb.waw.pl

Abstract

The conserved core of the exosome, the major eukaryotic 3' --> 5' exonuclease, contains nine subunits that form a ring similar to the phosphorolytic bacterial PNPase and archaeal exosome, as well as Dis3. Dis3 is homologous to bacterial RNase II, a hydrolytic enzyme. Previous studies have suggested that all subunits are active 3' --> 5' exoRNases. We show here that Dis3 is responsible for exosome core activity. The purified exosome core has a hydrolytic, processive and Mg(2+)-dependent activity with characteristics similar to those of recombinant Dis3. Moreover, a catalytically inactive Dis3 mutant has no exosome core activity in vitro and shows in vivo RNA degradation phenotypes similar to those resulting from exosome depletion. In contrast, mutations in Rrp41, the only subunit carrying a conserved phosphorolytic site, appear phenotypically not different from wild-type yeast. We observed that the yeast exosome ring mediates interactions with protein partners, providing an explanation for its essential function.

Comment in

PMID:
17173052
[PubMed - indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Nature Publishing Group
    Loading ...
    Write to the Help Desk