| 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 4OEH-NA-2 | NA | Na⁺ | E2I1 | GLU.ILE. | GLU.ILE. | ✔ | 3 | 3 | 2 | ✘ |
| 5C80-NA-2 | NA | Na⁺ | E2I1 | GLU.ILE. | GLU.ILE. | ✔ | 3 | 3 | 2 | ✘ |
| 2PGA-K-1 | K | K⁺ | E2I1 | GLU.ILE. | GLU.ILE. | ✔ | 3 | 3 | 2 | ✘ |
| 4OGK-K-1 | K | K⁺ | E2I1 | GLU.ILE. | GLU.ILE. | ✔ | 3 | 3 | 2 | ✔ |
| 7FC8-CA-1 | CA | Ca²⁺ | E2I1 | GLU.ILE. | GLU.HOH.ILE. | ✔ | 3 | 5 | 2 | ✘ |
| 7FC8-CA-2 | CA | Ca²⁺ | E2I1 | GLU.ILE. | GLU.HOH.ILE. | ✔ | 3 | 5 | 2 | ✘ |
| 7F44-CA-1 | CA | Ca²⁺ | E2I1 | GLU.ILE. | GLU.HOH.ILE. | ✔ | 3 | 5 | 2 | ✔ |
| 7F44-CA-2 | CA | Ca²⁺ | E2I1 | GLU.ILE. | GLU.HOH.ILE. | ✔ | 3 | 5 | 2 | ✘ |
| 7F44-CA-3 | CA | Ca²⁺ | E2I1 | GLU.ILE. | GLU.HOH.ILE. | ✔ | 3 | 5 | 2 | ✘ |
| 7F44-CA-4 | CA | Ca²⁺ | E2I1 | GLU.ILE. | GLU.HOH.ILE. | ✔ | 3 | 5 | 2 | ✘ |