| 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1G9U-CA-5 | CA | Ca²⁺ | D1E1N1 | ASN.ASP.GLU. | ASN.ASP.GLU.HOH. | ✔ | 3 | 7 | 2 | ✔ |
| 1G9U-CA-6 | CA | Ca²⁺ | D1E1N1 | ASN.ASP.GLU. | ASN.ASP.GLU.HOH. | ✔ | 3 | 7 | 2 | ✘ |
| 1G9U-CA-7 | CA | Ca²⁺ | D1E1N1 | ASN.ASP.GLU. | ASN.ASP.GLU.HOH. | ✔ | 3 | 7 | 2 | ✘ |
| 1G9U-CA-8 | CA | Ca²⁺ | D1E1N1 | ASN.ASP.GLU. | ASN.ASP.GLU.HOH. | ✔ | 3 | 7 | 2 | ✘ |