| 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1GR3-CA-2 | CA | Ca²⁺ | D3E1L1 | ASP.GLU.LEU. | ASP.GLU.LEU. | ✔ | 5 | 5 | 2 | ✔ |
| 1GR3-CA-3 | CA | Ca²⁺ | D3E1L1 | ASP.GLU.LEU. | ASP.GLU.LEU. | ✔ | 5 | 5 | 2 | ✘ |
| 1GR3-CA-4 | CA | Ca²⁺ | D3E1L1 | ASP.GLU.LEU. | ASP.GLU.LEU. | ✔ | 5 | 5 | 2 | ✘ |