Required for maturation of urease via the functional incorporation of the urease nickel metallocenter. UreD, UreF and UreG form a complex that acts as a GTP-hydrolysis-dependent molecular chaperone, activating the urease apoprotein by helping to assemble the nickel containing metallocenter of UreC. The UreE protein probably delivers the nickel (By similarity). Belongs to the UreD family.