Aminoacylates tRNA(Gln) with glutamate. Does not aminoacylate tRNA(Glu). ATP + L-glutamate + tRNA(Glu) = AMP + diphosphate + L-glutamyl-tRNA(Gln) Monomer. Belongs to the class-I aminoacyl-tRNA synthetase family. Glutamate--tRNA ligase type 1 subfamily.