4.3.2.5 additional information the the peptidyl-alpha-hydroxyglycine alpha-amidating lyase (PAL) is located on a domain of peptidylglycine alpha-amidating monooxygenase (PAM). The monooxygenase reaction is a slower step in peptide amidation, so that in peptidylglycine alpha-amidating monooxygenase (PAM) deficient mice, peptidyl-alpha-hydroxyglycine alpha-amidating lyase becomes the limiting factor of conversion of amidated peptides, overview. Peptidylglycine-alpha-hydroxylating monooxygenase, PHM, and peptidyl-alpha-hydroxyglycine alpha-amidating lyase, PAL, are stitched together in most vertebrates, kinetic studies with purified PHM and PAL revealed a higher affinity of PHM for its peptide substrate and a higher turnover number for PAL -, 730684