| 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1EMS-NA-1 | NA | Na⁺ | S1Y1 | SER.TYR. | HOH.SER.TYR. | ✔ | 2 | 3 | 2 | ✔ |
| 1EMS-NA-2 | NA | Na⁺ | S1Y1 | SER.TYR. | HOH.SER.TYR. | ✔ | 2 | 3 | 2 | ✘ |