This protein promotes the GTP-dependent binding of aminoacyl-tRNA to the A-site of ribosomes during protein biosynthesis. Monomer. Found in the large cell variant (LCV) stage, undetectable in the small cell variant (SCV) stage; at protein level. LCVs are more metabolically active than SCVs. Belongs to the TRAFAC class translation factor GTPase superfamily. Classic translation factor GTPase family. EF-Tu/EF-1A subfamily.