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Thrombin inhibition by the highly selective 'reversible suicide substrate'

Paolo Ascenzi1, Carlo Gallina, Martino Bolognesi

  • 1Department of Biology and Interdepartmental Laboratory for Electron Microscopy, University Roma Tre, Viale Marconi 446, I-00146 Roma, Italy. ascenzi@uniroma3.it

Protein and Peptide Letters
|July 21, 2005
PubMed

Insights

A novel thrombin inhibitor, Eoc-D-Phe-Pro-azaLys-ONp, acts as a reversible suicide substrate. Its hydrolysis product selectively inhibits human alpha-thrombin, offering potential antithrombotic therapy.

Area of Science:

  • Biochemistry
  • Pharmacology
  • Medicinal Chemistry

Background:

  • Thrombin is a key enzyme in the blood coagulation cascade.
  • Thrombin inhibitors are crucial antithrombotic agents.
  • Understanding enzyme inhibition mechanisms is vital for drug development.

Purpose of the Study:

  • To investigate the inhibition mechanism of Eoc-D-Phe-Pro-azaLys-ONp against human alpha-thrombin.
  • To characterize the properties of the hydrolysis product of Eoc-D-Phe-Pro-azaLys-ONp.

Main Methods:

  • Enzyme kinetics studies.
  • Chemical synthesis of N-ethoxycarbonyl-D-phenylalanyl-L-prolyl-alpha-azalysine p-nitrophenyl ester (Eoc-D-Phe-Pro-azaLys-ONp).
  • Characterization of the hydrolysis product.

Main Results:

  • Eoc-D-Phe-Pro-azaLys-ONp functions as a reversible suicide substrate for human alpha-thrombin.
  • The hydrolysis product, 1(N-ethoxycarbonyl-D-phenylalanyl-L-prolyl)-2(4-aminobutyl) hydrazine, is a potent and selective competitive inhibitor.
  • The inhibitor targets the active center of human alpha-thrombin.

Conclusions:

  • The study reveals an unusual inhibition mechanism for thrombin.
  • The hydrolysis product demonstrates high selectivity for human alpha-thrombin.
  • This finding supports the development of novel antithrombotic agents targeting thrombin.

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