Necessary for normal cell division and for the maintenance of normal septation. Binds GTP and GDP. Essential for growth, it cannot be disrupted. In depletion experiments cells become over 3-fold longer, are abnormally curved and nucleoids condense. Estimated to be present at 1000 copies per cell. Belongs to the TRAFAC class TrmE-Era-EngA-EngB-Septin-like GTPase superfamily. EngB GTPase family.