ATP-dependent RNA helicase required for ribosome biogenesis. Involved in the release of U14 snoRNA in pre-ribosomal complexes. Required for pre-rRNA cleavage at site A2 (By similarity). ATP + H2O = ADP + H(+) + phosphate Interacts with the U3 and U14 snoRNAs. Associates with pre-ribosomal complexes (By similarity). 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. DDX10/DBP4 subfamily.