Catalytic and regulatory basis of tRNA t6A modification by the KEOPS complex.

Abstract excerpt

N6-threonylcarbamoyladenosine (t6A) at tRNA position 37 is essential for translational fidelity and cellular homeostasis. The multi-subunit KEOPS complex catalyzes t6A formation in Archaea and Eukarya. Here we present cryo-EM structures of C. elegans KEOPS in its apo and tRNA-bound states. tRNA binding induces concerted conformational rearrangements, distorting the anticodon loop to project A37 into the Kae1...

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