Pyroglutamic acid

Pyroglutamic acid is an uncommon amino acid found in bacteriorhodopsin.

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Protein primary structure and posttranslational modifications
General:	Protein biosynthesis \| Peptide bond \| Proteolysis \| Racemization \| N-O acyl shift
N-terminus:	Acetylation \| Formylation \| Myristoylation \| Pyroglutamate \| methylation \| glycation \| myristoylation (Gly) \| carbamylation
C-terminus:	Amidation \| Glycosyl phosphatidylinositol (GPI) \| O-methylation \| glypiation \| ubiquitination \| sumoylation
Lysine:	Methylation \| Acetylation \| Acylation \| Hydroxylation \| Ubiquitination \| SUMOylation \| Desmosine \| deamination and oxidation to aldehyde\| O-glycosylation \| imine formation \| glycation \| carbamylation
Cysteine:	Disulfide bond \| Prenylation \| Palmitoylation
Serine/Threonine:	Phosphorylation \| Glycosylation
Tyrosine:	Phosphorylation \| Sulfation \| porphyrin ring linkage \| flavin linkage \| GFP prosthetic group (Thr-Tyr-Gly sequence) formation \| Lysine tyrosine quinone (LTQ) formation \| Topaquinone (TPQ) formation
Asparagine:	Deamidation \| Glycosylation
Aspartate:	Succinimide formation
Glutamine:	Transglutamination
Glutamate:	Carboxylation \| polyglutamylation \| polyglycylation
Arginine:	Citrullination \| Methylation
Proline:	Hydroxylation
←Amino acids		Secondary structure→

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