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. Belongs to the UreD family. Could be the product of a pseudogene. Neither O157 strain expresses urease. In both O157 strains this CDS is shorter than in urease producing E.coli strains, due to a premature stop codon. Urease activity can be restored in O157 / Sakai upon complementation with a wild-type ureD. This region of the chromosome is duplicated in strain O157:H7 / EDL933 but not in O157:H7 / Sakai.