| 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 5ESR-CO-1 | CO | Co²⁺ | H3 | HIS. | HIS. | ✔ | 3 | 3 | 2 | ✔ |
| 5ESR-CO-2 | CO | Co²⁺ | H3 | HIS. | HIS. | ✔ | 3 | 3 | 2 | ✔ |
| 5ESR-CO-3 | CO | Co²⁺ | H3 | HIS. | HIS. | ✔ | 3 | 3 | 2 | ✘ |
| 2J4J-CO-1 | CO | Co²⁺ | H3 | HIS. | HIS. | ✔ | 3 | 3 | 3 | ✔ |
| 2J4J-CO-2 | CO | Co²⁺ | H3 | HIS. | HIS. | ✔ | 3 | 3 | 3 | ✘ |
| 7W6V-CO-1 | CO | Co²⁺ | H3 | HIS. | HIS. | ✔ | 3 | 3 | 2 | ✘ |
| 7W6V-CO-2 | CO | Co²⁺ | H3 | HIS. | HIS. | ✔ | 3 | 3 | 2 | ✘ |