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The final step of 40S ribosomal subunit maturation is controlled by a dual key lock

Elife. 2021-04; 
Laura Plassart, Ramtin Shayan, Christian Montellese, Dana Rinaldi, Natacha Larburu, Carole Pichereaux, Carine Froment, Simon Lebaron, Marie-Françoise O'Donohue, Ulrike Kutay, Julien Marcoux, Pierre-Emmanuel Gleizes, Celia Plisson-Chastang
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摘要

Preventing premature interaction of pre-ribosomes with the translation apparatus is essential for translational accuracy. Hence, the final maturation step releasing functional 40S ribosomal subunits, namely processing of the 18S ribosomal RNA 3' end, is safeguarded by the protein DIM2, which both interacts with the endoribonuclease NOB1 and masks the rRNA cleavage site. To elucidate the control mechanism that unlocks NOB1 activity, we performed cryo-electron microscopy analysis of late human pre-40S particles purified using a catalytically inactive form of the ATPase RIO1. These structures, together with in vivo and in vitro functional analyses, support a model in which ATP-loaded RIO1 cooperates with ribosomal... More

关键词

chromosomes, cryo-EM, gene expression, human, human ribosome biogenesis, molecular biophysics, pre-rRNA processing, small ribosomal subunit, structural biology, structure-function study