| Id | Element | Ion | Binding family | Amino acids or nucleotide residues names | All bound residues | Is homomer | Number of bound amino acids or nucleotide residues | Number of all bound residues | Number of coordinating chains | Representative |
|---|---|---|---|---|---|---|---|---|---|---|
| 6X7E-CO-1 | CO | Co²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✘ |
| 2XGF-FE-1 | FE | Fe²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✔ |
| 2XGF-FE-2 | FE | Fe²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✘ |
| 2XGF-FE-3 | FE | Fe²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✘ |
| 2XGF-FE-4 | FE | Fe²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✘ |
| 2XGF-FE-5 | FE | Fe²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✘ |
| 2XGF-FE-6 | FE | Fe²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✘ |
| 2XGF-FE-7 | FE | Fe²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✘ |
| 5HT7-FE-1 | FE | Fe²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✔ |
| 6WZ0-FE-1 | FE | Fe²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✔ |
| 3IDQ-NI-1 | NI | Ni²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✔ |
| 1OCY-ZN-1 | ZN | Zn²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✔ |
| 2AJ7-NI-1 | NI | Ni²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✔ |
| 6OV6-MN-1 | MN | Mn²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✔ |
| 4S36-FE-1 | FE | Fe³⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✔ |
| 5EFV-FE-1 | FE | Fe³⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✔ |
| 6V8I-FE-1 | FE | Fe³⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✘ |
| 6V8I-FE-2 | FE | Fe³⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✘ |
| 6V8I-FE-3 | FE | Fe³⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✘ |
| 6V8I-FE-4 | FE | Fe³⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✘ |