Serine/threonine-protein kinase RIO2 (RIOK2) is a non-ribosomal factor required for normal ribosomal RNA biogenesis and cell cycle progression. It is necessary for processing of 20S pre-rRNA to the 18S rRNA in 40S ribosomal subunit synthesis. RIOK2 is also a ribosomal assembly factor that prevents premature translation initiation on the small (40S) subunit. It is needed for proper mitotic progression, regulates metaphase-anaphase transition and is a substrate of Plk1 (polo-like kinase1) which is phosphorylated by Plk1 at the Ser-335, Ser-380, and Ser-548 residues.
Phosphorylation of Right Open Reading Frame 2 (Rio2) Protein Kinase by Polo-like Kinase 1 Regulates Mitotic Progression*
Ting Liu
The Journal of Biological Chemistry, 21, 286(42)-286(42) (2011)
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