Fig. 7From: Efficient expression of sortase A from Staphylococcus aureus in Escherichia coli and its enzymatic characterizationsEffects of metal ions (5 mM) on SrtA activity. Effect of metal ions on SrtA activity. The enzyme assays were performed in the absence (control) and the presence of 5 mM various metal ions of Ca2+, Co2+, Cu2+, Fe2+, Mg2+, Mn2+, Ni2+, and Zn2+ Back to article page