| 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 7B24-CO-2 | CO | Co²⁺ | E2Q1 | GLN.GLU. | GLN.GLU. | ✘ | 3 | 3 | 2 | ✘ |
| 7B23-CO-1 | CO | Co²⁺ | E2Q1 | GLN.GLU. | GLN.GLU.HOH. | ✘ | 3 | 4 | 2 | ✘ |
| 7B23-CO-2 | CO | Co²⁺ | E2Q1 | GLN.GLU. | GLN.GLU. | ✘ | 3 | 3 | 2 | ✘ |
| 7B25-CO-1 | CO | Co²⁺ | E2Q1 | GLN.GLU. | GLN.GLU. | ✘ | 3 | 3 | 2 | ✘ |
| 7B25-CO-2 | CO | Co²⁺ | E2Q1 | GLN.GLU. | GLN.GLU. | ✘ | 3 | 3 | 2 | ✘ |
| 6HVL-CO-1 | CO | Co²⁺ | D1E1 | ASP.GLU. | 2BA.ASP.GLU. | ✔ | 2 | 3 | 2 | ✔ |
| 6HVL-CO-2 | CO | Co²⁺ | D1E1 | ASP.GLU. | 2BA.ASP.GLU. | ✔ | 2 | 3 | 2 | ✘ |
| 1JN1-CO-1 | CO | Co²⁺ | E3 | GLU. | GLU. | ✔ | 3 | 3 | 3 | ✘ |
| 1JN1-CO-2 | CO | Co²⁺ | E3 | GLU. | GLU. | ✔ | 3 | 3 | 3 | ✘ |
| 1JN1-CO-3 | CO | Co²⁺ | E3 | GLU. | GLU. | ✔ | 3 | 3 | 3 | ✘ |
| 1JN1-CO-4 | CO | Co²⁺ | E3 | GLU. | GLU. | ✔ | 3 | 3 | 3 | ✘ |
| 1T31-CO-1 | CO | Co²⁺ | E2 | GLU. | GLU.HOH. | ✔ | 2 | 5 | 2 | ✔ |
| 1QCA-CO-1 | CO | Co²⁺ | E2 | GLU. | GLU. | ✔ | 2 | 2 | 2 | ✘ |
| 1QCA-CO-2 | CO | Co²⁺ | E2 | GLU. | GLU. | ✔ | 2 | 2 | 2 | ✘ |
| 1QCA-CO-3 | CO | Co²⁺ | E2 | GLU. | GLU. | ✔ | 2 | 2 | 2 | ✘ |
| 1DZI-CO-1 | CO | Co²⁺ | E1S2T1 | GLU.SER.THR. | GLU.HOH.SER.THR. | ✘ | 4 | 6 | 2 | ✔ |
| 2XWJ-NI-1 | NI | Ni²⁺ | N1S2T1 | ASN.SER.THR. | ASN.HOH.SER.THR. | ✘ | 4 | 6 | 2 | ✘ |
| 1U5Z-NI-1 | NI | Ni²⁺ | H3 | HIS. | HIS. | ✔ | 3 | 3 | 3 | ✔ |
| 2G1L-NI-1 | NI | Ni²⁺ | H4 | HIS. | HIS. | ✔ | 4 | 4 | 2 | ✔ |
| 2G1L-NI-2 | NI | Ni²⁺ | H4 | HIS. | HIS. | ✔ | 4 | 4 | 2 | ✘ |