Cloning, Purification, and Partial Characterization of Bacillus subtilis Urate Oxidase Expressed in Escherichia coli
Figure 2
Recombinant enzyme purification. Fractions collected before and after Ni-NTA chromatography were visualized on 12% SDS-PAGE. Lane M, protein BenchMarker (Invitrogen); Lane 1, crude extract of uninduced E. coli cells; Lane 2, crude cell extract after induction for 3 hours; Lane 3, cellular extract (input); Lane 4, flow-through; Lane 5, washing step (20 mM imidazole); Lane 6, purified urate oxidase (30.5 g) after elution with 200 mM imidazole.