This protein promotes the GTP-dependent binding of aminoacyl-tRNA to the A-site of ribosomes during protein biosynthesis. Higher expression in leaves than in roots. Induced by light, low temperature and salicylic acid (SA). Repressed by high salt and abscisic acid (ABA). Belongs to the TRAFAC class translation factor GTPase superfamily. Classic translation factor GTPase family. EF-Tu/EF-1A subfamily.