DEAD-box RNA helicase-like protein required for pre-18S rRNA processing, specifically at sites A0, A1, and A2. Interacts with snoRNA U3. Interacts with MPP10, NOP19, RRP9, UTP8 and UTP18. Component of the ribosomal small subunit (SSU) processome composed of at least 40 protein subunits and snoRNA U3. Present with 172 molecules/cell in log phase SD medium. Belongs to the UTP25 family.