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  • Title: Structural basis for sequence-independent substrate selection by eukaryotic wobble base tRNA deaminase ADAT2/3.
    Author: Dolce LG, Zimmer AA, Tengo L, Weis F, Rubio MAT, Alfonzo JD, Kowalinski E.
    Journal: Nat Commun; 2022 Nov 08; 13(1):6737. PubMed ID: 36347890.
    Abstract:
    The essential deamination of adenosine A34 to inosine at the wobble base is the individual tRNA modification with the greatest effects on mRNA decoding, empowering a single tRNA to translate three different codons. To date, many aspects of how eukaryotic deaminases specifically select their multiple substrates remain unclear. Here, using cryo-EM, we present the structure of a eukaryotic ADAT2/3 deaminase bound to a full-length tRNA, revealing that the enzyme distorts the anticodon loop, but in contrast to the bacterial enzymes, selects its substrate via sequence-independent contacts of eukaryote-acquired flexible or intrinsically unfolded motifs distal from the conserved catalytic core. A gating mechanism for substrate entry to the active site is identified. Our multi-step tRNA recognition model yields insights into how RNA editing by A34 deamination evolved, shaped the genetic code, and directly impacts the eukaryotic proteome.
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