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. 2020 May 7;88(6):501–509. doi: 10.1007/s00239-020-09945-1

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© The Author(s) 2020, corrected publication 2024

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Fig. 6 — a Tertiary structure of A. fulgidus AlaRS complexed with tRNA (PDB ID: 3WQY). The corresponding regions to N. equitans AlaRS-α and AlaRS-β are colored in magenta and green, respectively, based on the multisequence alignment (Supplementary Material, Fig. S1). tRNA is shown in yellow. b Detailed stick representation of interactions between A. fulgidus AlaRS and C71 and A73 of tRNA^Ala. Distances within 3.5 Å between the amino acid residues of A. fulgidus AlaRS and any atoms of C71 and A73 are shown. c Schematic simplified representation of the proposed evolutionary processes of AlaRS-tRNA^Ala system. Before the appearance of the specific G3:U70, minimalist RNA and protein structures and their interactions resulted in requisite aminoacylation activities (Color figure online)