Predicted to enable protein serine/threonine kinase activity. Predicted to be involved in maturation of SSU-rRNA. Predicted to act upstream of or within phosphorylation and ribosome biogenesis. Predicted to be located in cytoplasm. Predicted to be part of preribosome, small subunit precursor. Predicted to be active in cytosol. Orthologous to human RIOK1 (RIO kinase 1).