Probable transporter of a GTP-driven Fe(2+) uptake system. Seems to be required for optimal intracellular infection of macrophages, to be important for growth and/or survival in iron-restricted amoebae. It also plays a key role in extracellular growth under iron-limited conditions. Belongs to the TRAFAC class TrmE-Era-EngA-EngB-Septin-like GTPase superfamily. FeoB GTPase (TC 9.A.8) family.