| 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 2ZQ0-CA-1 | CA | Ca²⁺ | E4X1 | AC1.GLU. | AC1.GLU. | ✘ | 5 | 5 | 2 | ✔ |
| 2ZQ0-CA-2 | CA | Ca²⁺ | E4X1 | AC1.GLU. | AC1.GLU. | ✘ | 5 | 5 | 2 | ✔ |