ATPase-dependent role of the atypical kinase Rio2 on the evolving pre-40S ribosomal subunit.
ATPase-dependent role of the atypical kinase Rio2 on the evolving pre-40S ribosomal subunit.
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DOI:
10.1038/nsmb.2403
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发表时间:
2012-12
影响因子:
16.8
通讯作者:
LaRonde-LeBlanc, Nicole
中科院分区:
文献类型:
--
作者:
Ferreira-Cerca, Sebastien;Sagar, Vatsala;Schaefer, Thorsten;Diop, Momar;Wesseling, Anne-Maria;Lu, Haiyun;Chai, Eileen;Hurt, Ed;LaRonde-LeBlanc, Nicole
Ribosome synthesis involves dynamic association of ribosome biogenesis factors with evolving pre-ribosomal particles. Rio2 is an atypical protein kinase required for pre-40S subunit maturation. We report the crystal structure of eukaryotic Rio2 with bound ATP/Mg2+. Unexpectedly, the structure reveals a phosphoaspartate intermediate with ADP/Mg2+ in the active site, typically found in Na+-, K+- and Ca2+-ATPases. Consistent with this finding, ctRio2 exhibits a robust ATPase activity in vitro. In vivo, Rio2 docks on the ribosome with its active site occluded, and its flexible loop positioned to interact with the pre-40S subunit. Moreover, Rio2 catalytic activity is required for its dissociation from the ribosome, a necessary step in pre-40S maturation. We propose that phosphoryl transfer from ATP to Asp257 in Rio2’s active site and subsequent hydrolysis of the aspartylphosphate could be a trigger to power late cytoplasmic 40S subunit biogenesis.
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