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Area of Science:

  • Biochemistry
  • Hematology
  • Molecular Biology

Background:

  • Platelet recruitment to injured blood vessels relies on von Willebrand factor (VWF).
  • The activity of VWF is regulated by the metalloprotease ADAMTS13.
  • ADAMTS13 cleaves VWF at a site exposed by shear-induced unfolding.

Purpose of the Study:

  • To elucidate the mechanism by which ADAMTS13 interacts with and cleaves VWF.
  • To investigate the role of different ADAMTS13 domains in VWF proteolysis.
  • To understand the structural basis for VWF-mediated allosteric activation of ADAMTS13.

Main Methods:

  • Kinetic analyses of ADAMTS13-VWF interactions.
  • Structural determination of ADAMTS13 domains.
  • Analysis of VWF conformational changes and cleavage site accessibility.

Main Results:

  • ADAMTS13 exosites (cysteine-rich and spacer domains) mediate initial VWF binding.
  • The ADAMTS13 disintegrin-like domain allosterically activates the metalloprotease domain upon VWF binding.
  • Crystal structure reveals a latent, occluded active site in ADAMTS13, requiring allosteric activation.
  • VWF acts as both an activating cofactor and the substrate for ADAMTS13.

Conclusions:

  • ADAMTS13 utilizes a multi-step mechanism involving distinct exosites for VWF binding and activation.
  • VWF binding induces conformational changes in ADAMTS13, enabling substrate proteolysis.
  • This study reveals a unique mechanism where the substrate also acts as an allosteric activator for its own cleavage.