| 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 4KLO-NA-1 | NA | Na⁺ | C2D3 | ASP.DC. | ASP.DC. | ✘ | 5 | 5 | 2 | ✘ |
| 4KLG-NA-1 | NA | Na⁺ | C2D3 | ASP.DC. | HOH. | ✘ | 5 | 6 | 2 | ✔ |
| 4KLJ-NA-2 | NA | Na⁺ | C2D3 | ASP.DC. | ASP.DC. | ✘ | 5 | 5 | 2 | ✔ |