| 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1Q3I-NI-2 | NI | Ni²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✔ |
| 6WZ3-CU-1 | CU | Cu²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✘ |
| 6R5W-CD-2 | CD | Cd²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✔ |
| 3PQI-FE-1 | FE | Fe³⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✔ |
| 4JRZ-NI-1 | NI | Ni²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✘ |
| 2UUI-NI-1 | NI | Ni²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✘ |
| 8DEL-ZN-1 | ZN | Zn²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✘ |
| 7AZ0-NI-1 | NI | Ni²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✔ |
| 7AYZ-NI-1 | NI | Ni²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✘ |
| 2NZ6-NI-1 | NI | Ni²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✔ |
| 3DE9-NI-1 | NI | Ni²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✘ |
| 3DE9-NI-2 | NI | Ni²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✘ |
| 2UUH-NI-1 | NI | Ni²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✔ |
| 2CFV-NI-1 | NI | Ni²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✘ |
| 7RWU-NI-1 | NI | Ni²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✘ |
| 7RWU-NI-2 | NI | Ni²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✘ |