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. 2023 Dec 15;52(2):513–524. doi: 10.1093/nar/gkad1188

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© The Author(s) 2023. Published by Oxford University Press on behalf of Nucleic Acids Research.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 4. — Cryo-EM imaging reveals an impact of Ma tRNA^Pyl identity elements on tRNA shape. (A) Overall structures of tRNA^Pyl from M. alvus (blue) and M. mazei (orange). (B) A view of superposed structures tRNA^Pyl from M. alvus and M. mazei illustrates the absence of a nucleotide at position 8 in tRNA^Pyl, leading to a change in positioning of conserved bases in this tRNA segment. (C) A view of the anticodon stem of Ma tRNA^Pyl illustrates that, unlike previous predictions, base A42a does not bulge out of the tRNA body and instead intercalates into the anticodon stem. (D) A view of superposed structures highlights the C45 bulge in Ma tRNA^Pyl. (E) A complete overlay of Ma tRNA^Pyl and Mm tRNA^Pyl shows the dissimilar features that arise between the identity elements U8 and G28:U42.