| 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 4JC7-NI-1 | NI | Ni²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 3 | ✘ |
| 4JCZ-NI-1 | NI | Ni²⁺ | H3 | HIS. | HIS. | ✔ | 3 | 3 | 3 | ✔ |
| 4J7T-NI-1 | NI | Ni²⁺ | H3 | HIS. | HIS. | ✔ | 3 | 3 | 3 | ✘ |
| 4J7T-NI-2 | NI | Ni²⁺ | H3 | HIS. | HIS. | ✔ | 3 | 3 | 3 | ✘ |
| 4J7T-NI-3 | NI | Ni²⁺ | H3 | HIS. | HIS. | ✔ | 3 | 3 | 3 | ✘ |
| 4J7T-NI-4 | NI | Ni²⁺ | H3 | HIS. | HIS. | ✔ | 3 | 3 | 3 | ✘ |
| 4J7T-NI-5 | NI | Ni²⁺ | H3 | HIS. | HIS. | ✔ | 3 | 3 | 3 | ✘ |
| 4H73-NI-1 | NI | Ni²⁺ | H2 | HIS. | HIS. | ✔ | 2 | 2 | 2 | ✔ |
| 4PEI-NI-1 | NI | Ni²⁺ | D1N1X1 | ASN.ASP.G46. | ASN.ASP.G46.HOH. | ✘ | 3 | 4 | 2 | ✔ |
| 4M76-NI-1 | NI | Ni²⁺ | D1S2T1 | ASP.SER.THR. | ASP.HOH.SER.THR. | ✘ | 4 | 6 | 2 | ✔ |
| 4D00-NI-1 | NI | Ni²⁺ | E2N1X1 | ASN.GLU.NAG. | ASN.GLU.NAG. | ✘ | 4 | 4 | 4 | ✔ |
| 4D00-NI-2 | NI | Ni²⁺ | E2N1X1 | ASN.GLU.NAG. | ASN.GLU.HOH.NAG. | ✘ | 4 | 5 | 4 | ✔ |
| 4D00-NI-3 | NI | Ni²⁺ | E2N1X1 | ASN.GLU.NAG. | ASN.GLU.NAG. | ✘ | 4 | 4 | 4 | ✔ |
| 3U8V-NI-1 | NI | Ni²⁺ | S2 | SER. | SER. | ✔ | 2 | 2 | 2 | ✔ |
| 3WQA-NI-1 | NI | Ni²⁺ | H5 | HIS. | HIS. | ✔ | 5 | 5 | 3 | ✔ |
| 4EW0-NI-1 | NI | Ni²⁺ | I2L1T1 | DT.ILE.LEU. | DT.ILE.LEU. | ✘ | 4 | 4 | 2 | ✔ |
| 4EW4-NI-1 | NI | Ni²⁺ | I2L1T1 | DT.ILE.LEU. | DT.ILE.LEU. | ✘ | 4 | 4 | 2 | ✔ |
| 3QSI-NI-1 | NI | Ni²⁺ | H3 | HIS. | HIS. | ✔ | 3 | 3 | 2 | ✔ |
| 3CGM-NI-1 | NI | Ni²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 2 | ✔ |
| 3CGM-NI-2 | NI | Ni²⁺ | H6 | HIS. | HIS. | ✔ | 6 | 6 | 2 | ✘ |