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Related Experiment Videos

Aminopeptidase P from human leukocytes.

I Rusu1, A Yaron

  • 1Department of Membrane Research and Biophysics, Weizmann Institute of Science, Rehovot, Israel.

European Journal of Biochemistry
|November 15, 1992
PubMed
Summary

Human leukocytes yield purified cytosolic aminopeptidase P, an enzyme crucial for cleaving N-terminal Xaa-Pro sequences in peptides and proteins. This enzyme, activated by Mn2+, shows specificity for proline residues and has implications for biological peptide processing.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Human Physiology

Background:

  • Cytosolic aminopeptidase P plays a role in protein processing.
  • Understanding its properties is key to comprehending cellular functions.

Purpose of the Study:

  • To obtain highly purified cytosolic aminopeptidase P from human leukocytes.
  • To characterize its substrate specificity, enzymatic activity, and cofactor requirements.

Main Methods:

  • Four-step purification procedure from human leukocyte buffy coats.
  • Size-exclusion HPLC and SDS/PAGE for molecular weight determination.
  • Enzyme activity assays with various peptide substrates and inhibitors.

Main Results:

  • Purified enzyme has a native molecular weight of 140,000 Da and subunits of 71,000 Da.

Related Experiment Videos

  • Aminopeptidase P specifically cleaves N-terminal Xaa-Pro sequences, including biologically active peptides and interleukin-6.
  • Enzyme activity is optimally stimulated by Mn2+ at pH 8 and inhibited by certain divalent cations and chelating agents.

    • Conclusions:

    • The study successfully purified and characterized human cytosolic aminopeptidase P.
    • The enzyme's specificity for N-terminal proline-containing sequences highlights its role in processing specific peptides and proteins.
    • Detailed characterization provides a foundation for further research into its physiological functions and therapeutic potential.