PHB
PCM
| Residue type | PCM type | Category | Position | UniProt PTM accession | Entries in PDB |
| ALA | None | Covalent chemical modification | Amino-acid backbone (N-terminal) | 1 | |
| GLN | None | Covalent chemical modification | Amino-acid backbone (N-terminal) | 8 | |
| LYS | None | Covalent chemical modification | Amino-acid backbone (N-terminal) | 3 | |
| TRP | None | Covalent chemical modification | Amino-acid backbone (N-terminal) | 6 |
