| 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 5M2T-NA-2 | NA | Na⁺ | E2I2 | GLU.ILE. | GLU.ILE. | ✔ | 4 | 4 | 2 | ✔ |
| 2PGA-K-2 | K | K⁺ | E2I2 | GLU.ILE. | GLU.ILE. | ✔ | 4 | 4 | 2 | ✘ |
| 3FWP-K-2 | K | K⁺ | E2I2 | GLU.ILE. | GLU.ILE. | ✔ | 4 | 4 | 2 | ✔ |
| 6IWL-CA-1 | CA | Ca²⁺ | E2I2 | GLU.ILE. | GLU.HOH.ILE. | ✔ | 4 | 6 | 2 | ✘ |
| 6IWL-CA-2 | CA | Ca²⁺ | E2I2 | GLU.ILE. | GLU.HOH.ILE. | ✔ | 4 | 6 | 2 | ✘ |
| 7FCM-CA-1 | CA | Ca²⁺ | E2I2 | GLU.ILE. | GLU.HOH.ILE. | ✔ | 4 | 6 | 2 | ✘ |
| 7FCM-CA-2 | CA | Ca²⁺ | E2I2 | GLU.ILE. | GLU.HOH.ILE. | ✔ | 4 | 6 | 2 | ✔ |