RNA degradation by the exosome is promoted by a nuclear polyadenylation complex.

By J. LaCava, J. Houseley, Cosmin Saveanu, E. Petfalski, E. Thompson, A. Jacquier, David Tollervey. Cell, 2005

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Ribosome Biogenesis in the Yeast Saccharomyces cerevisiae (2013, background): “Addition of approximately four to six A residues is performed by nuclear TRAMP complexes, containing either poly(A) polymerase Trf4 or Trf5, plus the RNA helicase Mtr4, and RNA-binding protein Air1 or Air2 (LaCava et al. 2005; Dez et al. 2006; Houseley and Tollervey 2006).”
tRNA biology charges to the front. (2010, background): “Detailed and elegant biochemical experiments support the claim that the TRAMP complex collaborates with the nuclear exosome to polyadenylate substrate tRNAs and degrade them from the 39 end (LaCava et al. 2005; Vanacova et al. 2005), and show that this activity acts on a pre-tRNA transcript (LaCava ”
Non-coding RNAs: lessons from the small nuclear and small nucleolar RNAs (2007, background): “This nuclear surveillance system seems to be closely linked to transcription and 3′-end processin”
XRN 5’→3’ exoribonucleases: Structure, mechanisms and functions (2013, background): “UnlikemRNAs stabilized by polyadenylation, several nuclear RNAs, including rRNAs, are destabilized via polyadenylation by the TRAMP complex, leading to accelerated exosome-mediated 3′ → 5′ decay [48].”
The many pathways of RNA degradation. (2009, background): “This multiplicity of function that characterizes ribonucleases in both bacteria and eukaryotes underlines the key importance of Cell 136, 763–776, February 20, 2009 ª2009 Elsevier Inc. 763 (LaCava et al., 2005).”