Required for ribosomal RNA processing. Interacts with snoRNA U3. Interacts with NOP1 and MPP10. Component of the ribosomal small subunit (SSU) processome composed of at least 40 protein subunits and snoRNA U3. Present with 6620 molecules/cell in log phase SD medium. Belongs to the WD repeat DCAF13/WDSOF1 family.