Abstract
The RNA exosome complex plays a central role in RNA processing and regulated turnover. Present both in cytoplasm and nucleus, the exosome functions through associations with ribonucleases and various adapter proteins (reviewed in [Kilchert et al., 2016]). The RNA exosome-associated EXOSC10 protein is a distributive, 3'-5' exoribonuclease. The following protocol describes an approach to monitor the ribonucleolytic activity of affinity-purified EXOSC10-containing RNA exosomes, originating from HEK-293 cells, as reported in (Domanski et al., 2016) and further detailed in the companion bio-protocol to this one (Domanski and LaCava, 2017).