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Oddone, A.* ; Lorentzen, E.* ; Basquin, J.* ; Gasch, A.* ; Rybin, V.* ; Conti, E.* ; Sattler, M.

Structural and biochemical characterization of the yeast exosome component Rrp40.

EMBO Rep. 8, 63-69 (2007)

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Open Access Gold möglich sobald Verlagsversion bei der ZB eingereicht worden ist.

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The exosome is a protein complex that is important in both degradation and 3'-processing of eukaryotic RNAs. We present the crystal structure of the Rrp40 exosome subunit from Saccharomyces cerevisiae at a resolution of 2.2 A. The structure comprises an S1 domain and an unusual KH (K homology) domain. Close packing of the S1 and KH domains is stabilized by a GxNG sequence, which is uniquely conserved in exosome KH domains. Nuclear magnetic resonance data reveal the presence of a manganese-binding site at the interface of the two domains. Isothermal titration calorimetry shows that Rrp40 and archaeal Rrp4 alone have very low intrinsic affinity for RNA. The affinity of an archaeal core exosome for RNA is significantly increased in the presence of the S1-KH subunit Rrp4, indicating that multiple subunits might contribute to cooperative binding of RNA substrates by the exosome.

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