Table 2. Detected post-translational modifications.

PDB residue names of recognized modified amino acids with their corresponding amino-acid base type, ordered by the type of post-translational modification (PTM). Glycosylation is not included in this table (see Section 2.2.8).

PTM type	Modified amino acids	Standard amino acids
Phosphorylation	TPO, SEP, PTR, NEP, HIP	THR, SER, TYR, HIS, HIS
Methylation	M3L, MLY, MLZ, 2MR, HIC, MHS, SMC	LYS, LYS, LYS, ARG, HIS, HIS, CYS
Acetylation	ALY, OAS	LYS, SER
Carboxylation	KCX, CGU	LYS, GLU
Hydroxylation	HYP, 0AF	PRO, TRP
Sulfation	TYS	TYR
Oxidation	CSD, CSO, OCS, SME, MHO, OMT	CYS, CYS, CYS, CYS, MET, MET
Pyroglutamate	PCA	GLU