ATP-binding RNA helicase involved in translation initiation. Remodels RNA in response to ADP and ATP concentrations by facilitating disruption, but also formation of RNA duplexes (By similarity). Redundant to DED1, may be required in conditions in which DED1 expression is decreased. ATP + H2O = ADP + H(+) + phosphate The Q motif is unique to and characteristic of the DEAD box family of RNA helicases and controls ATP binding and hydrolysis. Present with 1480 molecules/cell in log phase SD medium. Belongs to the DEAD box helicase family. DDX3/DED1 subfamily.