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- W2169336369 abstract "Abstract The proteolysis of VWF by ADAMTS13 is an essential step in the regulation of its hemostatic and thrombogenic potential. The cleavage occurs at strand β4 in the structural core of the A2 domain of VWF, so unfolding of the A2 domain is a prerequisite for cleavage. In the present study, we present the crystal structure of an engineered A2 domain that exhibits a significant difference in the α3-β4 loop compared with the previously reported structure of wild-type A2. Intriguingly, a metal ion was detected at a site formed mainly by the C-terminal region of the α3-β4 loop that was later identified as Ca2+ after various biophysical and biochemical studies. Force-probe molecular dynamic simulations of a modeled structure of the wild-type A2 featuring the discovered Ca2+-binding site revealed that an increase in force was needed to unfold strand β4 when Ca2+ was bound. Cleavage assays consistently demonstrated that Ca2+ binding stabilized the A2 domain and impeded its unfolding, and consequently protected it from cleavage by ADAMTS13. We have revealed a novel Ca2+-binding site at the A2 domain of VWF and demonstrated a relationship between Ca2+ and force in the regulation of VWF and primary hemostasis." @default.
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- W2169336369 date "2011-04-28" @default.
- W2169336369 modified "2023-10-01" @default.
- W2169336369 title "A novel calcium-binding site of von Willebrand factor A2 domain regulates its cleavage by ADAMTS13" @default.
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- W2169336369 doi "https://doi.org/10.1182/blood-2010-11-321596" @default.
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