Helicase required for pre-mRNA splicing, cold-responsive gene regulation and cold tolerance. ATP + H2O = ADP + H(+) + phosphate Up-regulated by cold. The Q motif is unique to and characteristic of the DEAD box family of RNA helicases and controls ATP binding and hydrolysis. Belongs to the DEAD box helicase family. DDX46/PRP5 subfamily. Truncated N-terminus.