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• W1586989529 abstract "The production of alpha-amidated peptides from their glycine-extended precursors is a two-step process involving the sequential action of two catalytic domains encoded by the bifunctional peptidylglycine alpha-amidating monooxygenase (PAM) precursor. The NH2-terminal third of the PAM precursor contains the first enzyme, peptidylglycine alpha-hydroxylating monooxygenase (PHM), a copper, molecular oxygen, and ascorbate-dependent enzyme. The middle third of the PAM precursor contains the second enzyme, peptidyl-alpha-hydroxyglycine alpha-amidating lyase (PAL). The COOH-terminal third of the PAM precursor encodes a transmembrane domain and a hydrophilic domain that may form a cytoplasmic tail. Antisera to a peptide within the PAL domain were used to identify a 50-kDa protein as the major form of PAL in bovine neurointermediate pituitary granules. This 50-kDa PAL protein was purified and found to begin at Asp434 of bPAM, indicating that it could arise through endoproteolytic cleavage of the bPAM precursor at Lys432-Lys433. With alpha-N-acetyl-Tyr-Val-alpha-hydroxyglycine as the substrate, PAL exhibits a pH optimum of 5.0; enzymatic activity is inhibited by high concentrations of salt but is relatively resistant to thiol reagents and urea. PAL activity is inhibited by EDTA and restored by a number of divalent metals, including Cd2+, Cu2+, Zn2+, and Ca2+. Kinetic studies using alpha-N-acetyl-Tyr-Val-alpha-hydroxyglycine indicate that PAL has a Km of 38 microM and a turnover number of 220/s. Expression vectors encoding only the soluble PHM domain or the PAM precursor from which the PHM domain had been deleted were constructed. hEK293 cells transfected with the PHM vector exhibited a 10-fold increase in secretion of PHM activity with no PHM activity detectable in control or transfected cells. hEK293 cells transfected with the PAL vector exhibited a 2-fold increase in secretion of PAL activity and a 15-fold increase in cellular PAL activity. Most of the PAL activity produced by the transfected cells remained membrane-associated." @default.
• W1586989529 created "2016-06-24" @default.
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• W1586989529 date "1991-04-01" @default.
• W1586989529 modified "2023-09-30" @default.
• W1586989529 title "Peptidyl-alpha-hydroxyglycine alpha-amidating lyase. Purification, characterization, and expression." @default.
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• W1586989529 doi "https://doi.org/10.1016/s0021-9258(20)89524-6" @default.
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