Probable ATP-binding RNA helicase. Required for 18S rRNA synthesis. ATP + H2O = ADP + H(+) + phosphate Interacts with NOP19 (PubMed:21941128). Interacts with UBP10 (PubMed:22902402, PubMed:26149687). Present with 721 molecules/cell in log phase SD medium. Belongs to the DEAD box helicase family. DEAH subfamily.