Binds GDP and GTP, and has low GTPase activity. May interact with phosphatidic acid (PA). Expressed in actively growing tissues and reproductive organs. Mostly expressed in leaves, stems and siliques. Also present in flowers and flower buds, and, to a lower extent, in roots. Belongs to the TRAFAC class OBG-HflX-like GTPase superfamily. OBG GTPase family. The nomenclature of the 3 Arabidopsis DRG genes is ambiguous; in the literature several gene names have been used for the same protein.