FIG. 3.

SodCI and SodCII activities in the presence of zinc chelator. (A) Strains producing SodCI or SodCII from a plasmid (in an otherwise sod null background) were grown overnight in LB with the indicated concentration of the zinc chelator TPEN. SOD-specific activity was determined from whole-cell extracts. (B) Wild-type and znuA null strains were grown overnight in LB with the indicated concentration of TPEN, and the resulting OD₆₀₀ was determined. The strains used were JS916, JS917, 14028, and JS918.