An essential GTPase which binds GTP, GDP and possibly (p)ppGpp with moderate affinity, with high nucleotide exchange rates and a fairly low GTP hydrolysis rate. It may play a role in control of the cell cycle, stress response, ribosome biogenesis and in those bacteria that undergo differentiation, in morphogenesis control (By similarity). Overexpression increases bacterial persistence in both stationary phase and biofilms in response to a number of antibiotics (PubMed:26051177). Monomer. Belongs to the TRAFAC class OBG-HflX-like GTPase superfamily. OBG GTPase family.