| 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 4IAK-SR-1 | SR | Sr²⁺ | D1X1 | ASP.SEP. | ADP.ASP.HOH.SEP. | ✘ | 2 | 7 | 2 | ✘ |
| 4IAY-SR-1 | SR | Sr²⁺ | D1X1 | ASP.SEP. | ADP.ASP.HOH.SEP. | ✘ | 2 | 7 | 2 | ✘ |