| 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 4R42-CA-3 | CA | Ca²⁺ | Q3 | GLN. | GLN.HOH. | ✔ | 3 | 7 | 3 | ✔ |
| 4R42-CA-4 | CA | Ca²⁺ | Q3 | GLN. | GLN.HOH. | ✔ | 3 | 7 | 3 | ✘ |
| 6J42-CA-3 | CA | Ca²⁺ | Q3 | GLN. | GLN.HOH. | ✔ | 3 | 4 | 3 | ✔ |
| 6J42-CA-4 | CA | Ca²⁺ | Q3 | GLN. | GLN.HOH. | ✔ | 3 | 4 | 3 | ✘ |