| 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1U1F-K-1 | K | K⁺ | I2S1 | ILE.SER. | ILE.SER. | ✔ | 3 | 3 | 2 | ✘ |
| 1U1E-K-2 | K | K⁺ | I2S1 | ILE.SER. | ILE.SER. | ✔ | 3 | 3 | 2 | ✘ |