Component of the SKI complex which is thought to be involved in exosome-mediated RNA decay and associates with transcriptionally active genes in a manner dependent on PAF1 complex (PAF1C) (PubMed:22511887). Involved in the regulation of potassium deprivation stress response (PubMed:21535471). ATP + H2O = ADP + H(+) + phosphate Component of the cytoplasmic SKI complex, which consists of SKI2, SKI3 and VIP3/SKI8. Expressed in vascular tissues of leaves and roots of young plants. Induced by low potassium, zeatin and cold stress. Down-regulated by high potassium treatment. Dwarf phenotype. Belongs to the DExH box helicase family. SKI2 subfamily.