| 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 4XK2-NA-1 | NA | Na⁺ | M1N1 | ASN.MET. | ASN.HOH.MET. | ✔ | 2 | 5 | 2 | ✔ |
| 4XK2-NA-2 | NA | Na⁺ | M1N1 | ASN.MET. | ASN.HOH.MET. | ✔ | 2 | 5 | 2 | ✔ |
| 4XK2-NA-3 | NA | Na⁺ | M1N1 | ASN.MET. | ASN.HOH.MET. | ✔ | 2 | 5 | 2 | ✘ |
| 4XK2-NA-4 | NA | Na⁺ | M1N1 | ASN.MET. | ASN.HOH.MET. | ✔ | 2 | 5 | 2 | ✘ |
| 4XK2-NA-5 | NA | Na⁺ | M1N1 | ASN.MET. | ASN.HOH.MET. | ✔ | 2 | 5 | 2 | ✘ |
| 4XK2-NA-6 | NA | Na⁺ | M1N1 | ASN.MET. | ASN.HOH.MET. | ✔ | 2 | 5 | 2 | ✘ |
| 4XK2-NA-7 | NA | Na⁺ | M1N1 | ASN.MET. | ASN.HOH.MET. | ✔ | 2 | 5 | 2 | ✘ |
| 4XK2-NA-8 | NA | Na⁺ | M1N1 | ASN.MET. | ASN.HOH.MET. | ✔ | 2 | 5 | 2 | ✘ |