The Enzyme Database

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EC 3.4.19.6     
Accepted name: pyroglutamyl-peptidase II
Reaction: Release of the N-terminal pyroglutamyl group from pGlu┼His-Xaa tripeptides and pGlu┼His-Xaa-Gly tetrapeptides
Other name(s): thyroliberinase; pyroglutamyl aminopeptidase II; , thyrotropin-releasing factor pyroglutamate aminopeptidase; pyroglutamate aminopeptidase II; pyroglutamyl peptidase II; thyroliberin-hydrolyzing pyroglutamate aminopeptidase; thyrotropin-releasing hormone-degrading pyroglutamate aminopeptidase; thyrotropin-releasing hormone-degrading peptidase; TRH aminopeptidase
Comments: Highly specific for thyrotropin releasing hormone (pyroglutamyl-histidyl-prolylamide). Will not cleave the pyroglutamyl-histidyl bond of luteinizing hormone releasing hormone. Found in serum and brain. Inhibited by metal chelators. In peptidase family M1 (membrane alanyl aminopeptidase family)
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, MEROPS, CAS registry number: 60063-88-9
References:
1.  Bauer, K. and Nowak, P. Characterization of a thyroliberin-degrading serum enzyme catalyzing the hydrolysis of thyroliberin at the pyroglutamyl-histidine bond. Eur. J. Biochem. 99 (1979) 239–246. [PMID: 115687]
2.  O'Connor, B. and O'Cuinn, G. Purification of and kinetic studies on a narrow specifity synaptosomal membrane pyroglutamate aminopeptidase from guinea-pig brain. Eur. J. Biochem. 150 (1985) 47–52. [PMID: 2862039]
3.  Wilk, S. and Wilk, E.K. Pyroglutamyl peptidase II, a thyrotropin releasing hormone degrading enzyme: purification and specificity studies of the rabbit brain enzyme. Neurochem. Int. 15 (1989) 81–89.
[EC 3.4.19.6 created 1992]
 
 


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