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Related Experiment Videos

Tissue kallikrein processes small proenkephalin peptides.

T Mindroiu1, O A Carretero, D Walz

  • 1Hypertension Research Division, Henry Ford Hospital, Detroit, MI 48202.

Biochimica Et Biophysica Acta
|January 8, 1991
PubMed
Summary

Hog pancreatic kallikrein efficiently cleaves bovine adrenal medulla docosapeptide (BAM-22P) at arginine residues, suggesting a role in processing enkephalin precursors. Peptide F is a poor substrate for this enzyme.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Endocrinology

Background:

  • Tissue kallikreins are implicated in processing polypeptide hormone precursors.
  • Enkephalins are endogenous opioid peptides derived from larger precursor proteins.

Purpose of the Study:

  • To investigate the enzymatic activity of hog pancreatic kallikrein on enkephalin precursors, peptide F and bovine adrenal medulla docosapeptide (BAM-22P).
  • To determine the substrate specificity and kinetic parameters of kallikrein hydrolysis of these precursors under varying pH conditions.

Main Methods:

  • Incubation of peptide F and BAM-22P with hog pancreatic kallikrein at different pH values (5.5 and 8.5).
  • Analysis of hydrolysis products using techniques to identify released enkephalins.
  • Determination of kinetic parameters (KM, kcat, kcat/KM) for enzyme-substrate interactions.

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Main Results:

  • Hog pancreatic kallikrein released Met5-enkephalin and Met5-Lys6-enkephalin from peptide F, with preferential cleavage between lysine residues.
  • Cleavage of peptide F was minimal at acidic pH (5.5).
  • Kallikrein hydrolyzed BAM-22P, releasing Met5-Arg6-enkephalin, indicating cleavage between arginine residues, with efficient activity at both pH 8.5 and 5.5.

Conclusions:

  • Peptide F is unlikely to be a physiological substrate for kallikrein.
  • Tissue kallikrein can process proenkephalin precursors like BAM-22P by cleaving specific Arg-Arg bonds, particularly within the acidic environment of secretory granules.