| 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 6NLK-FE-5 | FE | Fe²⁺ | N4Q3 | ASN.GLN. | ASN.GLN. | ✔ | 7 | 7 | 4 | ✘ |
| 6NLK-FE-6 | FE | Fe²⁺ | N4Q3 | ASN.GLN. | ASN.GLN. | ✔ | 7 | 7 | 4 | ✘ |