Enhancement of in vitro renaturation of recombinant human pro‐urokinase by ampicillin

Ampicillin was used in vitro renaturation process of recombinant human prourokinase and it can obviously improve the yield of the renaturation, although not as well as arginine. When ampicillin was used together with arginine or lysine, it decreased the yield of the renaturation comparing with the yield when arginine or lysine used alone.