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    Cell. 2006 Dec 15;127(6):1223-37.

    Reconstitution, activities, and structure of the eukaryotic RNA exosome.

    Liu Q, Greimann JC, Lima CD.

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    Structural Biology Program, Sloan-Kettering Institute, New York, NY 10021, USA.

    Erratum in

    • Cell. 2007 Oct 5;131(1):188-9.

    Abstract

    The RNA exosome is a multisubunit 3' to 5' exoribonuclease complex that participates in degradation and processing of cellular RNA. To determine the activities and structure of the eukaryotic exosome, we report the reconstitution of 9-subunit exosomes from yeast and human and reconstitution of 10- and 11-subunit exosomes from yeast. Comparative biochemical analysis between purified subunits and reconstituted exosomes using AU-rich, polyadenylated (poly[A]), generic, and structured RNA substrates reveals processive phosphorolytic activities for human Rrp41/Rrp45 and the 9-subunit human exosome, processive hydrolytic activities for yeast Rrp44 and the yeast 10-subunit exosome, distributive hydrolytic activities for Rrp6, and processive and distributive hydrolytic activities for the yeast 11-subunit exosome. To elucidate the architecture of a eukaryotic exosome, its conserved surfaces, and the structural basis for RNA decay, we report the X-ray structure determination for the 286 kDa nine-subunit human exosome at 3.35 A.

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    PMID:
    17174896
    [PubMed - indexed for MEDLINE]

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