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Alboaggregins A and B. Structure and interaction with human platelets

M A Kowalska1, L Tan, J C Holt

  • 1Department of Physiology, Sol Sherry Thrombosis Research Center, Temple University School of Medicine, Philadelphia, PA 19140, USA. kowalska@kermit.oncol.chop.edu

Thrombosis and Haemostasis
|April 8, 1998
PubMed
Summary

Certain viper venoms contain proteins that stimulate platelet aggregation. Researchers identified two new proteins, alboaggregins A and B, from Trimeresurus albolabris venom, which activate platelets via GPIb binding.

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Area of Science:

  • Biochemistry
  • Toxicology
  • Hematology

Background:

  • Viper venoms possess diverse platelet-binding proteins, primarily inhibiting platelet agglutination.
  • Proteins binding to platelet GPIb/IX are common in viper venoms.

Purpose of the Study:

  • To elucidate the primary structures of novel platelet-aggregating proteins, alboaggregins A and B.
  • To investigate the mechanism of platelet activation by these snake venom proteins.

Main Methods:

  • Isolation and characterization of alboaggregins A and B from Trimeresurus albolabris venom.
  • Analysis of protein structure, including cysteine conservation and chain homology.
  • Assessment of platelet agglutination, aggregation, and release reactions in response to alboaggregins.

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Main Results:

  • Alboaggregins A and B, isolated from Trimeresurus albolabris, stimulate platelet agglutination and aggregation.
  • Both proteins bind to fixed platelets, with similar agglutination effects.
  • Alboaggregin A, a tetramer, induced platelet aggregation and release more potently (20-fold lower EC50) than alboaggregin B, a dimer.
  • Conserved cysteines were observed in both structures.

Conclusions:

  • The dimeric structure of alboaggregin B is sufficient for GPIb binding and platelet agglutination.
  • The tetrameric structure of alboaggregin A significantly enhances platelet aggregation and release reactions.
  • These findings reveal unique platelet-activating functions of specific viper venom proteins.