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glutaminyl-peptide cyclotransferase activity

Known as: L-glutaminyl-peptide gamma-glutamyltransferase (cyclizing), glutaminyl cyclase activity, glutaminyl-transfer ribonucleate cyclotransferase activity 
Catalysis of the reaction: L-glutaminyl-peptide = 5-oxoprolyl-peptide + NH3. [EC:2.3.2.5]
National Institutes of Health