| 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 5NUR-CA-1 | CA | Ca²⁺ | N2X1 | ASN.KDO. | ASN.KDO. | ✘ | 3 | 3 | 2 | ✔ |
| 5NUR-CA-3 | CA | Ca²⁺ | N2X1 | ASN.KDO. | ASN.KDO. | ✘ | 3 | 3 | 2 | ✔ |