Hydrolyzes ATP, and can also hydrolyze GTP with lower efficiency. Has lower affinity for GTP (Potential). Exhibits GTPase activity (PubMed:19086295). Exhibits similar binding affinities and hydrolytic activities toward both GTP and ATP (PubMed:20876569, PubMed:26912459). Binds to the 26 S ribosomal RNA in vitro, but not to the 5.8 S or 18 S rRNA (PubMed:20876569). Confers sensitivity to salinity stress by suppressing the anti-oxidation enzymatic activities and increasing lipid peroxidation thus leading to the accumulation of reactive oxygen species (ROS) (PubMed:23550829). Activated by GAP1. Monomer (Potential). Interacts with GAP1. Localized mainly in the cytosol under NaCl treatment, but translocates to the plasma membrane upon wounding. The C-terminal domain is involved in RNA binding. Belongs to the TRAFAC class OBG-HflX-like GTPase superfamily. OBG GTPase family. YchF/OLA1 subfamily.