Evolutionarily-conserved 5'-3' exonuclease; deNADing enzyme that modulates mitochondrial NAD-capped RNA; component of cytoplasmic P-bodies involved in mRNA decay; positively regulates transcription initiation and elongation; involved in microtubule-mediated processes, filamentous growth, rRNA maturation, telomere maintenance, tRNA intron turnover; negative regulator of autophagy; activated by glycolytic flux and scavenger decapping enzyme Dcs1p; role in preventing L-A mycovirus pathogenesis