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Human thimet oligopeptidase

P M Dando1, M A Brown, A J Barrett

  • 1Department of Biochemistry, Strangeways Research Laboratory, Cambridge, UK.

The Biochemical Journal
|September 1, 1993
PubMed
Summary
This summary is machine-generated.

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Human thimet oligopeptidase shares structural and functional similarities with rat and chicken enzymes, indicating strong evolutionary conservation. Its substrate specificity may depend on proline residue and C-terminus location, not just hydrophobic interactions.

Area of Science:

  • Biochemistry
  • Enzymology
  • Evolutionary Biology

Background:

  • Thimet oligopeptidase (TEP) is a metallo-oligopeptidase implicated in various physiological processes.
  • Understanding TEP's structure and function across species is crucial for elucidating its biological roles.

Purpose of the Study:

  • To purify and characterize human thimet oligopeptidase from erythrocytes.
  • To compare human TEP with orthologs from rat testis and chicken liver.
  • To investigate the evolutionary conservation and substrate specificity of TEP.

Main Methods:

  • Purification of human thimet oligopeptidase to homogeneity.
  • Comparison of enzyme properties and substrate specificity with rat and chicken TEP.
  • Utilizing antisera for cross-reactivity analysis.

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Main Results:

  • Human TEP purified from erythrocytes exhibits properties similar to rat and chicken TEP.
  • An antiserum against rat TEP cross-reacts with human and chicken enzymes, suggesting strong evolutionary conservation.
  • Human TEP is a thiol-dependent metallo-oligopeptidase (M(r) ~75,000) with conserved substrate specificity, though inhibitor Ki values differ.
  • Substrate specificity determinants may involve proline residue position and C-terminus availability, alongside hydrophobic interactions.

Conclusions:

  • Human thimet oligopeptidase is structurally and functionally conserved across mammalian and avian species.
  • The study provides insights into TEP's substrate specificity, highlighting the importance of proline and C-terminus.
  • Further research is needed to clarify the precise cleavage mechanisms and physiological substrates of thimet oligopeptidase.