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Dermatan sulfate, an important member of the glycosaminoglycan family, interacts with heparin cofactor II, a member of the serpin family of proteins, to modulate antithrombotic response. Yet, the nature of this interaction remains poorly understood at a molecular level. We report the genetic algorithm-based combinatorial virtual library screening study of a natural, high-affinity dermatan sulfate hexasaccharide with heparin cofactor II. Of the 192 topologies possible for the hexasaccharide, only 16 satisfied the "high-specificity" criteria used in computational study. Of these, 13 topologies were predicted to bind in the heparin-binding site of heparin cofactor II at a ∼60° angle to helix D, a novel binding mode. This new binding geometry satisfies all known solution and mutagenesis data and supports thrombin ternary complexation through a template mechanism. The study is expected to facilitate the design of allosteric agonists of heparin cofactor II as antithrombotic agents.

Understanding Dermatan Sulfate−Heparin Cofactor II Interaction through Virtual Library Screening