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Related Experiment Videos

Thrombin inhibition by cyclic peptides from thrombomodulin

J C Lougheed1, C L Bowman, D P Meininger

  • 1Department of Chemistry and Biochemistry, University of California-San Diego, La Jolla 92093-0601, USA.

Protein Science : a Publication of the Protein Society
|April 1, 1995
PubMed
Summary

Synthesized peptides from thrombomodulin

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Chemistry

Background:

  • Thrombomodulin (TM) is a crucial cofactor for protein C activation.
  • Epidermal growth factor (EGF)-like domains of TM are involved in protein-protein interactions.
  • Understanding TM's structure-function relationship is vital for anticoagulant therapies.

Purpose of the Study:

  • To synthesize and evaluate peptides from TM's EGF-like domain loops for thrombin inhibition.
  • To identify structural features essential for the inhibitory activity of TM peptides.
  • To explore potential therapeutic applications of TM-derived peptides.

Main Methods:

  • Chemical synthesis of peptides corresponding to TM's fourth, fifth, and sixth EGF-like domain loops.
  • Assays for thrombin inhibition, including fibrinogen clotting and protein C activation inhibition.
  • Structure-activity relationship studies involving linear and cyclized peptides.

Main Results:

  • Peptides from the fifth EGF-like domain exhibited significant inhibition of thrombin activity.
  • Disulfide bond cyclization and C-terminal tail attachment enhanced peptide inhibitory potency.
  • A constrained analog (TM52-1 + 5C) showed improved inhibition of protein C activation.

Conclusions:

  • The fifth EGF-like domain of TM contains critical regions for thrombin inhibition.
  • Specific structural modifications, such as disulfide cyclization, are key for potent anticoagulant activity.
  • TM-derived peptides represent promising candidates for novel anticoagulant strategies.

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