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Related Experiment Videos

Bovine intermediate pituitary alpha-amidation enzyme: preliminary characterization.

B A Eipper, C C Glembotski, R E Mains

    Peptides
    |November 1, 1983
    PubMed
    Summary

    This study identifies a secretory granule enzyme that amidates peptides. Copper and ascorbate significantly enhance this alpha-amidation activity, suggesting a monooxygenase role in peptide biosynthesis.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Peptide Chemistry

    Background:

    • Secretory granules contain enzymes involved in peptide processing.
    • Alpha-amidation is a crucial post-translational modification for many bioactive peptides.

    Purpose of the Study:

    • To characterize a secretory granule enzymatic activity responsible for peptide amidation.
    • To elucidate the biochemical properties and cofactor requirements of this alpha-amidation enzyme.

    Main Methods:

    • Enzyme kinetics using radiolabeled peptide substrate (mono-[125I]-D-Tyr-Val-Gly).
    • Assessing the effects of various cofactors (copper, ascorbate) and inhibitors on enzymatic activity.
    • Kinetic analysis using Lineweaver Burk plots.

    Main Results:

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    • The enzyme exhibits optimal activity at pH 7-8 and is primarily soluble.
    • Copper and ascorbate significantly stimulated amidation activity (9-fold and 7-fold, respectively).
    • The enzyme follows Michaelis-Menten kinetics and is competitively inhibited by peptides with COOH-terminal Gly residues.

    Conclusions:

    • The enzyme is likely a copper- and ascorbate-dependent monooxygenase.
    • This secretory granule activity is proposed to be involved in the physiological alpha-amidation of bioactive peptides.