Predicted to enable protein kinase activity. Predicted to be involved in several processes, including positive regulation of rRNA processing; positive regulation of ribosomal small subunit export from nucleus; and regulation of mitotic metaphase/anaphase transition. Predicted to be located in cytoplasm. Predicted to be part of preribosome, small subunit precursor. Predicted to be active in cytosol and nucleus. Is expressed in several structures, including adrenal gland; eye; genitourinary system; integumental system; and intestine. Orthologous to human RIOK2 (RIO kinase 2).