May play a role in mRNA degradation (By similarity). Endonuclease required for processing of 20S pre-rRNA precursor and biogenesis of 40S ribosomal subunits (By similarity). May interact with UPF2 (Probable). Component of the small ribosomal subunit, ribosomal RNA processing complex (SSU RRP complex) (By similarity). Belongs to the NOB1 family.