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Fig. 2. (A) Omit electron density, contoured at 3.5ċ, for the L-isoleucine molecule bound to the IleRS Rossmann-fold domain. (B) The ball-and-stick representation of the L-isoleucine molecule bound to the aminoacylation site in the Rossmann-fold domain of the IleRS. The carbon atoms of the bound L-isoleucine and the active-site amino acid residues are shown in green and yellow, respectively. The nitrogen and oxygen atoms are shown in dark blue and red, respectively. (C) The L-valine molecule bound to the aminoacylation site of IleRS. Presentation is as in (B).