Hydrolyzes ATP, and can also hydrolyze GTP with lower efficiency. Has lower affinity for GTP (Potential). Exhibits GTPase activity (By similarity). Exhibits similar binding affinities and hydrolytic activities toward both GTP and ATP (By similarity). Binds to the 26 S ribosomal RNA in vitro, but not to the 5.8 S or 18 S rRNA (By similarity). 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) (By similarity). Activated by GAP1. Monomer (Potential). Interacts with GAP1 (By similarity). Localized mainly in the cytosol under NaCl treatment, but translocates to the plasma membrane upon wounding. Belongs to the TRAFAC class OBG-HflX-like GTPase superfamily. OBG GTPase family. YchF/OLA1 subfamily.