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Activation of EDTA-treated DHQS by various divalent metal ions. The activity of EDTA-treated PfuDHQS in the presence of a range of other divalent metal ions is given as a percentage of the activity seen for the Cd2+-activated enzyme.
| Divalent metal ion | PfuDHQS activity (%) |
|---|---|
| Cd | 100 |
| Co | 82 |
| Zn | 71 |
| Mn | 41 |
| Ni | 3 |
| Fe | 2 |
| Cu | 2 |
| Ca | 2 |
| Hg | 2 |
| Mg | 1 |
| Ba | 0 |
| Cr | 0 |
| No metal | 1 |
| No metal/EDTA treated | 0.1 |
