| 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1U1G-K-2 | K | K⁺ | E2I2S1 | GLU.ILE.SER. | GLU.ILE.SER. | ✔ | 5 | 5 | 2 | ✘ |
| 1U1E-K-1 | K | K⁺ | E2I2S1 | GLU.ILE.SER. | GLU.ILE.SER. | ✔ | 5 | 5 | 2 | ✘ |
| 3FWP-K-3 | K | K⁺ | E2I2S1 | GLU.ILE.SER. | GLU.ILE.SER. | ✔ | 5 | 5 | 2 | ✘ |