C2O
PCM
| Residue type | PCM type | Category | Position | UniProt PTM accession | Entries in PDB |
| HIS | None | Metal coordination | Amino-acid side chain (Any position) | 130 | |
| HIS | None | Metal coordination | Amino-acid side chain (Any position) | 20 | |
| HIS | None | Metal coordination | Amino-acid side chain (Any position) | 23 | |
| HIS | None | Metal coordination | Amino-acid side chain (Any position) | 129 |
