Involved in pre-mRNA splicing. Required for the export of mRNA out of the nucleus (By similarity). ATP + H2O = ADP + H(+) + phosphate Binds ALYREF/THOC4 and DDX39B/BAT1 (By similarity). Interacts with SARNP (By similarity). Interacts with MX1 (By similarity). Interacts with MCM3AP (By similarity). Can translocate to the cytoplasm in the presence of MX1. Belongs to the DEAD box helicase family. DECD subfamily.