ID 2.3.2.5 DE Glutaminyl-peptide cyclotransferase. AN Glutaminyl cyclase. AN Glutaminyl-tRNA cyclotransferase. CA L-glutaminyl-peptide = 5-oxoprolyl-peptide + NH(3). CC -!- Involved in the formation of thyrotropin-releasing hormone and other CC biologically active peptides containing N-terminal pyroglutamyl CC residues. CC -!- The enzyme from papaya also acts on glutaminyl-tRNA. DR Q0V8G3, QPCTL_BOVIN; Q9NXS2, QPCTL_HUMAN; Q4R942, QPCTL_MACFA; DR Q8BH73, QPCTL_MOUSE; Q84WV9, QPCT_ARATH ; A7ISW2, QPCT_BOIDE ; DR A7ISW1, QPCT_BOIIR ; Q9YIB5, QPCT_BOTJA ; Q28120, QPCT_BOVIN ; DR P0CV92, QPCT_CROAT ; Q54B14, QPCT_DICDI ; Q90YA8, QPCT_GLOBL ; DR Q16769, QPCT_HUMAN ; Q9CYK2, QPCT_MOUSE ; //