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Gamma-glutamylcyclotransferase

From Wikipedia, the free encyclopedia
gamma-glutamylcyclotransferase
Identifiers
EC no.2.3.2.4
CAS no.9045-44-7
Databases
IntEnzIntEnz view
BRENDABRENDA entry
ExPASyNiceZyme view
KEGGKEGG entry
MetaCycmetabolic pathway
PRIAMprofile
PDB structuresRCSB PDB PDBe PDBsum
Gene OntologyAmiGO / QuickGO
Search
PMCarticles
PubMedarticles
NCBIproteins

In enzymology, a gamma-glutamylcyclotransferase (EC 2.3.2.4) is an enzyme that catalyzes the chemical reaction

(5-L-glutamyl)-L-amino acid 5-oxoproline + L-amino acid

Hence, this enzyme has one substrate, (5-L-glutamyl)-L-amino acid, and two products, 5-oxoproline and L-amino acid.

This enzyme belongs to the family of transferases, specifically the aminoacyltransferases. The systematic name of this enzyme class is (5-L-glutamyl)-L-amino-acid 5-glutamyltransferase (cyclizing). Other names in common use include gamma-glutamyl-amino acid cyclotransferase, gamma-L-glutamylcyclotransferase, and L-glutamic cyclase. This enzyme participates in glutathione metabolism.

Structural studies

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As of late 2007, two structures have been solved for this class of enzymes, with PDB accession codes 2PN7 and 2RBH.

References

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  • Bodnaryk RP; McGirr L (1973). "Purification, properties and function of a unique gamma-glutamyl cyclotransferase from the housefly, Musca domestica L". Biochim. Biophys. Acta. 315 (2): 352–362. doi:10.1016/0005-2744(73)90264-7.
  • Orlowski M, Richman PG, Meister A (1969). "Isolation and properties of gamma-L-glutamylcyclotransferase from human brain". Biochemistry. 8 (3): 1048–1055. doi:10.1021/bi00831a036. PMID 5781001.