Table S4.
Mean coordination distances in high-resolution structures in the PDB for Mn2+, Co2+, Cu+/2+, and Zn2+ (57)
| PDB | Mn2+, Å | Co2+, Å | Cu+/2+, Å | Zn2+, Å |
| M – H2O | 2.22 | 2.09 | 2.13 | 2.06 |
| M – O, monodentate | 2.12 | 2.01 | 1.96 | 2.01 |
| M – O, main chain | 2.19 | 2.08 | 2.04 | 2.07 |
| M – N, imidazole | 2.16 | 2.04 | 2.02 | 2.04 |