This protein promotes the GTP-dependent binding of aminoacyl-tRNA to the A-site of ribosomes during protein biosynthesis. Protects glycyl-tRNA(Gly) from hydrolysis by E.coli D-aminoacyl-tRNA deacylase (dtd) (PubMed:27224426). Monomer. Phosphorylated on a threonine. Belongs to the TRAFAC class translation factor GTPase superfamily. Classic translation factor GTPase family. EF-Tu/EF-1A subfamily.