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Glutaminyl-peptide cyclotransferase

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glutaminyl-peptide cyclotransferase
Identifiers
EC no.2.3.2.5
CAS no.37257-21-9
Databases
IntEnzIntEnz view
BRENDABRENDA entry
ExPASyNiceZyme view
KEGGKEGG entry
MetaCycmetabolic pathway
PRIAMprofile
PDB structuresRCSB PDB PDBe PDBsum
Gene OntologyAmiGO / QuickGO
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NCBIproteins

In enzymology, a glutaminyl-peptide cyclotransferase (EC 2.3.2.5) is an enzyme that catalyzes the chemical reaction

L-glutaminyl-peptide {\displaystyle \rightleftharpoons } 5-oxoprolyl-peptide + NH3 or
L-glutamyl-peptide {\displaystyle \rightleftharpoons } 5-oxoprolyl-peptide + H2O

Hence, this enzyme has one substrate, L-glutaminyl-peptide or L-glutamyl-peptide, and two products, 5-oxoprolyl-peptide and NH3 or H2O. The N-terminal 5-oxoproline residue on the peptide is also commonly known as pyroglutamic acid.

This enzyme belongs to the family of transferases, specifically the aminoacyltransferases. The systematic name of this enzyme class is L-glutaminyl-peptide gamma-glutamyltransferase (cyclizing). Other names in common use include glutaminyl-tRNA cyclotransferase, glutaminyl cyclase, and glutaminyl-transfer ribonucleate cyclotransferase.

Structural studies

As of late 2007, 8 structures have been solved for this class of enzymes, with PDB accession codes 2AFM, 2AFO, 2AFS, 2AFU, 2AFW, 2AFX, 2AFZ, and 2IWA.

Human gene

QPCT - note that Q is one-letter abbreviation for glutamine, and glutaminyl is the name of the acyl group.

References

Transferases: acyltransferases (EC 2.3)
2.3.1: other than amino-acyl groups
2.3.2: Aminoacyltransferases
2.3.3: converted into alkyl on transfer
Enzymes
Activity
Regulation
Classification
Kinetics
Types
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