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. Cells do not express urease. The artificial UreEF fusion protein binds to UreD-UreABC apoprotein complex, and UreG can also bind to this. The UreF portion seems to function normally in nickel transfer, while the UreE function is impaired in the fusion. Belongs to the UreF family.