This model describes a glycyl-tRNA synthetase distinct from the two alpha and two beta chains of the tetrameric E. coli glycyl-tRNA synthetase. This enzyme is a homodimeric class II tRNA synthetase and is recognized by pfam model tRNA-synt_2b, which recognizes His, Ser, Pro, and this set of glycyl-tRNA synthetases. [Protein synthesis, tRNA aminoacylation]