PCA

PYROGLUTAMIC ACID

PCA in polymers: 716 entries. Examples include: 1EHD 2MV1 3PL3

PCA as a free ligand exists in 10 entries. Examples include: 2J5V 1B2Y 2PFY

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View summary at Ligand Expo



Chemical Component Summary

NamePYROGLUTAMIC ACID
Identifiers(2S)-5-oxopyrrolidine-2-carboxylic acid
FormulaC5 H7 N O3
Molecular Weight129.11
TypeL-PEPTIDE LINKING
Isomeric SMILESOC(=O)[C@@H]1CCC(=O)N1
InChIInChI=1S/C5H7NO3/c7-4-2-1-3(6-4)5(8)9/h3H,1-2H2,(H,6,7)(H,8,9)/t3-/m0/s1
InChIKeyODHCTXKNWHHXJC-VKHMYHEASA-N

Chemical Details

Formal Charge0
Atom Count16
Chiral Atom Count1
Chiral AtomsCA
Bond Count16
Aromatic Bond Count0
Leaving AtomsOXT, HXT

Drug Info: DrugBank

DrugBank IDDB11245 Different stereochemistry
NamePyroglutamate
Groupsapproved
DescriptionPyroglutamic acid (also known as PCA, 5-oxoproline, pidolic acid, or pyroglutamate for its basic form) is an uncommon and little studied amino acid derivative in which the free amino group of glutamic acid or glutamine cyclizes to form a lactam. It is a metabolite in the glutathione cycle that is converted to glutamate by 5-oxoprolinase. Pyroglutamate is found in many proteins including bacteriorhodopsin. N-terminal glutamic acid and glutamine residues can spontaneously cyclize to become pyroglutamate. This is one of several forms of blocked N-terminals which present a problem for N-terminal sequencing using Edman chemistry, which requires a free primary amino group not present in pyroglutamic acid. The enzyme pyroglutamate aminopeptidase can restore a free N-terminus by cleaving off the pyroglutamate residue.
Synonyms
  • 5-oxoproline
  • PCA
  • Pidolic acid
  • Pyroglutamic acid
SaltsZinc pidolate
Brand NamesCleansing Foaming Gel Acne Pro Skin
Route of administrationTopical
Categories
  • Acids, Acyclic
  • Amino Acids
  • Amino Acids, Acidic
  • Amino Acids, Cyclic
  • Amino Acids, Dicarboxylic
CAS number149-87-1