A substrate binding model for the KEOPS tRNA modifying complex

A substrate binding model for the KEOPS tRNA modifying complex

Abstract The KEOPS complex, which is conserved across archaea and eukaryotes, is composed of four core subunits; Pcc1, Kae1, Bud32 and Cgi121. KEOPS is crucial for the fitness of all organisms examined. In humans, pathogenic mutations in KEOPS genes lead to Galloway–Mowat syndrome, an autosomal-rece...

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Main Authors: Jonah Beenstock, Samara Mishelle Ona, Jennifer Porat, Stephen Orlicky, Leo C. K. Wan, Derek F. Ceccarelli, Pierre Maisonneuve, Rachel K. Szilard, Zhe Yin, Dheva Setiaputra, Daniel Y. L. Mao, Morgan Khan, Shaunak Raval, David C. Schriemer, Mark A. Bayfield, Daniel Durocher, Frank Sicheri
Format: Article
Language:English
Published: Nature Portfolio 2020-12-01
Series:Nature Communications
Online Access:https://doi.org/10.1038/s41467-020-19990-5
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Summary:Abstract The KEOPS complex, which is conserved across archaea and eukaryotes, is composed of four core subunits; Pcc1, Kae1, Bud32 and Cgi121. KEOPS is crucial for the fitness of all organisms examined. In humans, pathogenic mutations in KEOPS genes lead to Galloway–Mowat syndrome, an autosomal-recessive disease causing childhood lethality. Kae1 catalyzes the universal and essential tRNA modification N6-threonylcarbamoyl adenosine, but the precise roles of all other KEOPS subunits remain an enigma. Here we show using structure-guided studies that Cgi121 recruits tRNA to KEOPS by binding to its 3’ CCA tail. A composite model of KEOPS bound to tRNA reveals that all KEOPS subunits form an extended tRNA-binding surface that we have validated in vitro and in vivo to mediate the interaction with the tRNA substrate and its modification. These findings provide a framework for understanding the inner workings of KEOPS and delineate why all KEOPS subunits are essential.
ISSN:2041-1723

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