Rio2 is an atypical protein kinase required for pre-40S subunit maturation. The crystal structure of eukaryotic Rio2 with bound ATP and Mg2+ reveals an unusual phosphoaspartate intermediate typically observed in P-type ATPases. Rio2 has in vitro ATPase activity, and its catalytic activity stimulates its own dissociation from the ribosome, which is required for pre-40S maturation.
- Sébastien Ferreira-Cerca
- Vatsala Sagar
- Nicole LaRonde-LeBlanc