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Assays for Studying the Role of Vitronectin in Bacterial Adhesion and Serum Resistance
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Certain high molecular weight heparin chains have high affinity for vitronectin.

R E Edens1, L A LeBrun, R J Linhardt

  • 1Department of Pediatrics, University of Iowa, Iowa City, Iowa, USA. erik-edens@uiowa.edu

Archives of Biochemistry and Biophysics
|July 5, 2001
PubMed
Summary

Heparin binds to vitronectin, but only specific high molecular weight heparin chains interact strongly. This finding helps resolve conflicting data on heparin

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Area of Science:

  • Biochemistry
  • Immunology
  • Proteomics

Background:

  • Vitronectin is a key protein regulating complement and coagulation systems.
  • Heparin is known to interact with vitronectin, but its effect on complement regulation is debated.
  • Previous studies show conflicting results regarding heparin's influence on vitronectin's complement inhibition.

Purpose of the Study:

  • To investigate the interaction between heparin and vitronectin.
  • To resolve apparent paradoxes in the literature regarding heparin's effect on complement activity.
  • To determine the binding affinity and characteristics of heparin species interacting with vitronectin.

Main Methods:

  • Two-dimensional affinity resolution electrophoresis (2DARE) was employed.
  • 2DARE allowed simultaneous determination of heparin-vitronectin binding affinity and heparin molecular weight (M(r)).
  • Analysis involved assessing heparin's movement retardation in the presence of vitronectin.

Main Results:

  • A sub-population of heparin chains (M(r) > 8000) exhibited high-affinity binding to vitronectin.
  • Most high molecular weight and all lower molecular weight heparin chains showed minimal affinity for vitronectin.
  • The binding affinity (K(d)) was calculated based on the degree of movement retardation.

Conclusions:

  • Vitronectin interacts specifically with certain high molecular weight heparin chains.
  • A unique binding domain likely exists within these specific heparin chains for vitronectin.
  • These findings reconcile conflicting data on heparin's role in complement regulation via vitronectin.