FIG. 5.
Cartoon representation of the TyrRSapm dimer superimposed on the archaeal TyrRS 2CYC from P. horikoshii. The archaeal dimer is transparent and colored in silver, except for the structural motif (αs6-turn-αs7, corresponding to the α7 helix in TyrRSapm), colored in opaque cyan. The TyrRSapm first monomer superimposed on the 1CYC first monomer is colored in yellow. The second monomer secondary-structure elements are colored as outlined in the legend for Fig. 4. The arrow shows the rotation to be applied to the mimivirus second monomer to superimpose its β7-turn-β8 onto the P. horikoshii βs7-ηs3-βs8 motif. N-term, N terminus; C-term, C terminus.