Plays an unknown essential role and a regulatory role in sporulation. Overexpression suppresses sporulation although cell growth rate was not reduced. Impaired differentiation was eliminated by addition of decoyinine, an inhibitor of GMP synthesis. Overexpression has no effect on undecylprodigiosin production, but decreases actinorhodin production. 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. Plays a role in control of the cell cycle, stress response, ribosome biogenesis and in those bacteria that undergo differentiation, in morphogenesis control. Monomer. No longer associated with the cell membrane after salt-washing. Expressed during vegetative growth it disappears during stationary phase and sporulation (at protein level). Essential for growth, it cannot be disrupted. Belongs to the TRAFAC class OBG-HflX-like GTPase superfamily. OBG GTPase family.