| 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 4G9P-K-1 | K | K⁺ | E1Q1S1 | GLN.GLU.SER. | GLN.GLU.SER. | ✔ | 3 | 3 | 2 | ✔ |
| 4G9P-K-2 | K | K⁺ | E1Q1S1 | GLN.GLU.SER. | GLN.GLU.SER. | ✔ | 3 | 3 | 2 | ✘ |