Probable ATP-binding RNA helicase. Required for 18S rRNA synthesis. May play a role in restructuring of the pre-rRNA. ATP + H2O = ADP + H(+) + phosphate Interacts with snoRNA U3. Component of the ribosomal small subunit (SSU) processome composed of at least 40 protein subunits and snoRNA U3. Present with 2000 molecules/cell in log phase SD medium. Belongs to the DEAD box helicase family. DEAH subfamily.