CUA
PCM
| Residue type | PCM type | Category | Position | UniProt PTM accession | Entries in PDB |
| CYS | None | Metal coordination | Amino-acid side chain (Any position) | 403 | |
| CYS | None | Metal coordination | Amino-acid backbone (Any position) | 2 | |
| CYS | None | Metal coordination | Amino-acid side chain (Any position) | 354 | |
| GLN | None | Metal coordination | Amino-acid backbone (Any position) | 32 | |
| GLN | None | Metal coordination | Amino-acid backbone (Any position) | 2 | |
| GLU | None | Metal coordination | Amino-acid side chain (Any position) | 1 | |
| GLU | None | Metal coordination | Amino-acid backbone (Any position) | 20 | |
| GLU | None | Metal coordination | Amino-acid backbone (Any position) | 68 | |
| GLU | None | Metal coordination | Amino-acid backbone (Any position) | 2 | |
| HIS | None | Metal coordination | Amino-acid side chain (Any position) | 163 | |
| HIS | None | Metal coordination | Amino-acid backbone (Any position) | 5 | |
| HIS | None | Metal coordination | Amino-acid side chain (Any position) | 5 | |
| HIS | None | Metal coordination | Amino-acid side chain (Any position) | 205 | |
| HIS | None | Metal coordination | Amino-acid backbone (Any position) | 1 | |
| HIS | None | Metal coordination | Amino-acid side chain (Any position) | 8 | |
| MET | None | Metal coordination | Amino-acid side chain (Any position) | 129 | |
| MET | None | Metal coordination | Amino-acid side chain (Any position) | 73 | |
| TRP | None | Metal coordination | Amino-acid backbone (Any position) | 4 | |
| TRP | None | Metal coordination | Amino-acid backbone (Any position) | 61 |
