This protein promotes the GTP-dependent binding of aminoacyl-tRNA to the A-site of ribosomes during protein biosynthesis. 3 EF-1-alpha are expressed under different developmental control in Xenopus laevis. This protein is expressed in embryos beginning at the mid-blastula transition and in adults cells. Belongs to the TRAFAC class translation factor GTPase superfamily. Classic translation factor GTPase family. EF-Tu/EF-1A subfamily.