Probable RNase involved in rRNA stability through maturation and/or degradation of precursor rRNAs. Preferentially cleaves UA sequences in the 5' precursor region of 5S rRNA (PubMed:28978920). Binds to RNA in loop regions with AU-rich sequences. Binds to the consensus sequence GGC(U/A)(U/A)U(U/C) in vitro (PubMed:12614195). Activity increases in the presence of Mg(2+) (PubMed:28978920). RNA-binding is heat stable (PubMed:12614195). Mainly homotrimer, but may form homohexamer, and homononamer. Belongs to the FAU-1 family. Extended N-terminus.