Required for the final endonucleolytic cleavage at site D converting 20S pre-rRNA into the mature 18S rRNA. Required for the final steps of cytoplasmic maturation of the 40S ribosomal subunit. The association with the very late 40S subunit intermediate seems to follow RIO2 association with precursors of the 40S subunit and may involve a translation-like checkpoint point cycle preceeding the binding to the 60S ribosomal subunit. Despite the protein kinase domain is proposed to act predominantly as an ATPase. The catalytic activity regulates its dynamic association with the 40S subunit. Has a role in the cell cycle where it is required for entrance into S-phase and in the control of the onset of anaphase. Appears to also be involved in the maintenance of chromosome stability and correct mitotic segregation.

Belongs to the protein kinase superfamily. RIO-type Ser/Thr kinase family.

484 amino acids

MSLEDKFDSLSVSQGASDHINNQLLEKYSHKIKTDELSFSRAKTSKDKANRATVENVLDPRTMRFLKSMVTRGVIADLNGCLSTGKEANVYHAFAGTGKAPVIDEETGQYEVLETDGSRAEYAIKIYKTSILVFKDRERYVDGEFRFRNSRSQHNPRKMIKIWAEKEFRNLKRIYQSGVIPAPKPIEVKNNVLVMEFLSRGNGFASPKLKDYPYKNRDEIFHYYHTMVAYMRLLYQVCRLVHADLSEYNTIVHDDKLYMIDVSQSVEPEHPMSLDFLRMDIKNVNLYFEKMGISIFPERVIFQFVISETLEKFKGDYNNISALVAYIASNLPIKSTEQDEAEDEIFRSLHLVRSLGGLEERDFDRYTDGKFDLLKSLIAHDNERNFAASEQFEFDNADHECSSGTEEFSDDEEDGSSGSEEDDEEEGEYYDDDEPKVLKGKKHEDKDLKKLRKQEAKDAKREKRKTKVKKHIKKKLVKKTKSKK

56.1 kDa

(Note: Representative image - actual molecular weight may vary depending on tag type and expression method)

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