Amino Acid Discrimination by a class I aminoacyl-tRNA synthetase specified by negative determinants
Bullock, T.L., Uter, N., Nissan, T.A., Perona, J.J.(2003) J Mol Biol 328: 395-408
- PubMed: 12691748 
- DOI: 10.1016/s0022-2836(03)00305-x
- Primary Citation of Related Structures:  
1O0B, 1O0C - PubMed Abstract: 
The 2.5 A crystal structure of Escherichia coli glutaminyl-tRNA synthetase in a quaternary complex with tRNA(Gln), an ATP analog and glutamate reveals that the non-cognate amino acid adopts a distinct binding mode within the active site cleft. In contrast to the binding of cognate glutamine, one oxygen of the charged glutamate carboxylate group makes a direct ion-pair interaction with the strictly conserved Arg30 residue located in the first half of the dinucleotide fold domain ...