Template:Protein primary structure

Protein primary structure and posttranslational modifications

General

Single specific AAs

Serine/Threonine	ADP-ribosylation Dephosphorylation Glycosylation O-GlcNAc Phosphorylation
Tyrosine	Adenylylation ADP-ribosylation Dephosphorylation Detyrosination Flavin linkage Phosphorylation Porphyrin ring linkage Sulfation Topaquinone (TPQ) formation
Cysteine	Palmitoylation Prenylation
Aspartate	ADP-ribosylation Succinimide formation
Glutamate	ADP-ribosylation Carboxylation Methylation Polyglutamylation Polyglycylation
Asparagine	Deamidation Glycosylation
Glutamine	Transglutamination
Lysine	Acetylation Acylation Adenylylation ADP-ribosylation Butyrylation Carbamylation Deamination Glutarylation Glycation Hydroxylation Imine formation Lactylation Malonylation Methylation Methylmalonylation O-glycosylation Oxidative deamination to aldehyde Propionylation Succinylation Sumoylation Ubiquitination
Arginine	ADP-ribosylation Citrullination Methylation
Proline	Hydroxylation
Histidine	Adenylylation Diphthamide formation
Tryptophan	C-mannosylation

Crosslinks between two AAs

Cysteine–Cysteine	ADP-ribosylation Disulfide bond
Methionine–Hydroxylysine	Sulfilimine bond
Lysine–Tyrosine	Lysine tyrosylquinone (LTQ) formation
Tryptophan–Tryptophan	Tryptophan tryptophylquinone (TTQ) formation

Crosslinks between three AAs

Serine–Tyrosine–Glycine	p-Hydroxybenzylidene-imidazolinone (HBI) formation (chromophore)
Histidine–Tyrosine–Glycine	4-(p-hydroxybenzylidene)-5-imidazolinone (HBI) formation (chromophore)
Alanine–Serine–Glycine	Methylidene-imidazolone (MIO) formation

Crosslinks between four AAs

Allysine–Allysine–Allysine–Lysine	Desmosine