An enzyme(s) that converts glutaminyl-peptides into pyroglutamyl-peptides. Presence in pituitary, brain, adrenal medulla, and lymphocytes.


The mechanism for the post-translational conversion of glutamine to pyroglutamic acid on the N terminus of newly synthesized peptides and proteins is unknown. An assay is reported that permits measurement of the rate of conversion of Gln-His-Pro-NH2 to pyroGlu-His-Pro-NH2 (TRH). Using this assay, we demonstrate that the spontaneous cyclization of the N… (More)


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