ATP-dependent RNA helicase. Is essential for the directed and fasciculated early outgrowth of the bolwig nerves, as well as for its navigation at later stages. Is required during post-transcriptional gene expression. Plays a role during morphogenetic process, apoptosis and the establishment of cell polarity. ATP + H2O = ADP + H(+) + phosphate Belongs to the DEAD box helicase family. DDX41 subfamily.