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 streptomycin 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. Belongs to the TRAFAC class OBG-HflX-like GTPase superfamily. OBG GTPase family.