Catalyzes the GTP-dependent ribosomal translocation step during translation elongation. During this step, the ribosome changes from the pre-translocational (PRE) to the post-translocational (POST) state as the newly formed A-site-bound peptidyl-tRNA and P-site-bound deacylated tRNA move to the P and E sites, respectively. Catalyzes the coordinated movement of the two tRNA molecules, the mRNA and conformational changes in the ribosome (By similarity). Involved in cold responses leading to freezing tolerance via the induction of cold-responsive genes (PubMed:9401119, PubMed:12032361). Protein biosynthesis; polypeptide chain elongation. May interact with glutaredoxins (Grxs). Expressed in root, stem, leaves, flowers and siliques. Induced by cold. Blocks specifically low temperature-induced transcription of cold-responsive genes such as RD29A (PubMed:9401119, PubMed:12032361). Reduced capacity to develop freezing tolerance but does not impair the vernalization response. Defective in protein synthesis in the cold (PubMed:12032361). Belongs to the TRAFAC class translation factor GTPase superfamily. Classic translation factor GTPase family. Truncated N-terminus. Truncated N-terminus.