Figure 1. A. A schematic description of key features in
augmented and non-augmented D-helix in tRNAGlx.B. Crystal structure of Eco -GluRS (pdb ID: 8i9i). The
N-terminal and the C-terminal domains are annotated. The crystal
contains a bound glutamate molecule and a Zn2+ ion
(CPK model). C. Superimposed Zn-binding domains inEco -GluRS, Bbu -GluRS (pdb ID: 4gri) and E. coliYadB gene product Eco -Glu-Q-RS (pdb ID: 1nzj).