| 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 2NZ6-NI-2 | NI | Ni²⁺ | H4K1 | HIS.LYS. | HIS.LYS. | ✔ | 5 | 5 | 3 | ✔ |
| 2NZ6-NI-3 | NI | Ni²⁺ | H4K1 | HIS.LYS. | HIS.LYS. | ✔ | 5 | 5 | 3 | ✔ |
| 2NZ6-NI-4 | NI | Ni²⁺ | H4K1 | HIS.LYS. | HIS.LYS. | ✔ | 5 | 5 | 3 | ✘ |