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Wang HW, et al.  (2007) Architecture of the yeast Rrp44 exosome complex suggests routes of RNA recruitment for 3' end processing. Proc Natl Acad Sci U S A 104(43):16844-9

Abstract: The eukaryotic core exosome (CE) is a conserved nine-subunit protein complex important for 3' end trimming and degradation of RNA. In yeast, the Rrp44 protein constitutively associates with the CE and provides the sole source of processive 3'-to-5' exoribonuclease activity. Here we present EM reconstructions of the core and Rrp44-bound exosome complexes. The two-lobed Rrp44 protein binds to the RNase PH domain side of the exosome and buttresses the bottom of the exosome-processing chamber. The Rrp44 C-terminal body part containing an RNase II-type active site is anchored to the exosome through a conserved set of interactions mainly to the Rrp45 and Rrp43 subunit, whereas the Rrp44 N-terminal head part is anchored to the Rrp41 subunit and may function as a roadblock to restrict access of RNA to the active site in the body region. The Rrp44-exosome (RE) architecture suggests an active site sequestration mechanism for strict control of 3' exoribonuclease activity in the RE complex.

Status: Published Type: Journal Article PubMed ID: 17942686

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Topics Genes linked to topics
CSL4 DIS3 MTR3 RRP4 RRP40 RRP42 RRP43 RRP45 RRP46 SKI6
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