| 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 3EN1-FE-1 | FE | Fe²⁺ | H3 | HIS. | HIS. | ✔ | 3 | 3 | 3 | ✔ |
| 3EQQ-FE-1 | FE | Fe²⁺ | H3 | HIS. | HIS. | ✔ | 3 | 3 | 3 | ✘ |
| 1SHR-FE-1 | FE | Fe³⁺ | H3 | HIS. | CYN.HIS. | ✔ | 3 | 4 | 2 | ✔ |
| 7CZL-FE-1 | FE | Fe²⁺ | H3 | HIS. | HIS. | ✘ | 3 | 3 | 2 | ✔ |