| 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 4K4G-CA-3 | CA | Ca²⁺ | C2I2 | CYS.DC.ILE. | CYS.DC.ILE. | ✘ | 4 | 4 | 2 | ✔ |
| 4K4H-CA-3 | CA | Ca²⁺ | C2I2 | CYS.DC.ILE. | ALA.DA.HOH.ILE.SER. | ✘ | 4 | 6 | 2 | ✔ |
| 4K4I-CA-2 | CA | Ca²⁺ | C2I2 | CYS.DC.ILE. | CYS.DC.HOH.ILE. | ✘ | 4 | 5 | 2 | ✘ |