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NMR structure of the unmodified ASL of E.coli tRNAi (residues 3 to 19) (13) (A), hairpin structures with the same loop-sequence including t6A modification at position 37 (green) (S.pombe tRNAi, structure closest to the average of refined NMR ensemble) (B) and X-ray crystallography (S.cerevisiae tRNAi residues 27 to 43) (14) (C). Ribbons are drawn through P atoms and nucleobases of the anticodon are depicted in yellow.
