Non-discriminating glutamyl-tRNA synthetase. Catalyzes the attachment of glutamate to tRNA(Glu) in a two-step reaction: glutamate is first activated by ATP to form Glu-AMP and then transferred to the acceptor end of tRNA(Glu). Acylates both tRNA(Glu) and tRNA(Gln) with glutamate, but has 13-fold higher efficiency with tRNA(Glu). ATP + L-glutamate + tRNA(Glu) = AMP + diphosphate + L-glutamyl-tRNA(Glu) Does not require zinc. Monomer. This organism lacks a tRNA synthetase for tRNA(Gln). Instead, tRNA(Gln) is first charged with Glu, and then the bound glutamate is converted to glutamine by GatCAB. Belongs to the class-I aminoacyl-tRNA synthetase family. Glutamate--tRNA ligase type 1 subfamily.