1.14.11.42 the free and complex forms with 2-oxoglutarate and Ni(II) ion at 2.5 and 2.8 A resolution, respectively. The catalytic domain consists of a beta-jellyroll fold. The enzyme forms a homodimer through C-terminal helix bundle formation, thereby presenting a large, positively charged patch involved in tRNA binding. In a docking model of the TYW5-tRNAPhe complex, the D arm is captured by the positively charged patch, and the anticodon loop is directed into the positively charged catalytic pocket 726070