Structure and dynamics of the platelet integrin-binding C4 domain of von Willebrand factor
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Structure and dynamics of the platelet integrin-binding C4 domain of von Willebrand factor. / Xu, Emma-Ruoqi; von Bülow, Sören; Chen, Po-Chia; Lenting, Peter J; Kolšek, Katra; Aponte-Santamaría, Camilo; Simon, Bernd; Foot, Jaelle; Obser, Tobias; Schneppenheim, Reinhard; Gräter, Frauke; Denis, Cecile V; Wilmanns, Matthias; Hennig, Janosch.
in: BLOOD, Jahrgang 133, Nr. 4, 24.01.2019, S. 366-376.Publikationen: SCORING: Beitrag in Fachzeitschrift/Zeitung › SCORING: Zeitschriftenaufsatz › Forschung › Begutachtung
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TY - JOUR
T1 - Structure and dynamics of the platelet integrin-binding C4 domain of von Willebrand factor
AU - Xu, Emma-Ruoqi
AU - von Bülow, Sören
AU - Chen, Po-Chia
AU - Lenting, Peter J
AU - Kolšek, Katra
AU - Aponte-Santamaría, Camilo
AU - Simon, Bernd
AU - Foot, Jaelle
AU - Obser, Tobias
AU - Schneppenheim, Reinhard
AU - Gräter, Frauke
AU - Denis, Cecile V
AU - Wilmanns, Matthias
AU - Hennig, Janosch
N1 - © 2019 by The American Society of Hematology.
PY - 2019/1/24
Y1 - 2019/1/24
N2 - Von Willebrand factor (VWF) is a key player in the regulation of hemostasis by promoting recruitment of platelets to sites of vascular injury. An array of 6 C domains forms the dimeric C-terminal VWF stem. Upon shear force activation, the stem adopts an open conformation allowing the adhesion of VWF to platelets and the vessel wall. To understand the underlying molecular mechanism and associated functional perturbations in disease-related variants, knowledge of high-resolution structures and dynamics of C domains is of paramount interest. Here, we present the solution structure of the VWF C4 domain, which binds to the platelet integrin and is therefore crucial for the VWF function. In the structure, we observed 5 intra- and inter-subdomain disulfide bridges, of which 1 is unique in the C4 domain. The structure further revealed an unusually hinged 2-subdomain arrangement. The hinge is confined to a very short segment around V2547 connecting the 2 subdomains. Together with 2 nearby inter-subdomain disulfide bridges, this hinge induces slow conformational changes and positional alternations of both subdomains with respect to each other. Furthermore, the structure demonstrates that a clinical gain-of-function VWF variant (Y2561) is more likely to have an effect on the arrangement of the C4 domain with neighboring domains rather than impairing platelet integrin binding.
AB - Von Willebrand factor (VWF) is a key player in the regulation of hemostasis by promoting recruitment of platelets to sites of vascular injury. An array of 6 C domains forms the dimeric C-terminal VWF stem. Upon shear force activation, the stem adopts an open conformation allowing the adhesion of VWF to platelets and the vessel wall. To understand the underlying molecular mechanism and associated functional perturbations in disease-related variants, knowledge of high-resolution structures and dynamics of C domains is of paramount interest. Here, we present the solution structure of the VWF C4 domain, which binds to the platelet integrin and is therefore crucial for the VWF function. In the structure, we observed 5 intra- and inter-subdomain disulfide bridges, of which 1 is unique in the C4 domain. The structure further revealed an unusually hinged 2-subdomain arrangement. The hinge is confined to a very short segment around V2547 connecting the 2 subdomains. Together with 2 nearby inter-subdomain disulfide bridges, this hinge induces slow conformational changes and positional alternations of both subdomains with respect to each other. Furthermore, the structure demonstrates that a clinical gain-of-function VWF variant (Y2561) is more likely to have an effect on the arrangement of the C4 domain with neighboring domains rather than impairing platelet integrin binding.
KW - Journal Article
U2 - 10.1182/blood-2018-04-843615
DO - 10.1182/blood-2018-04-843615
M3 - SCORING: Journal article
C2 - 30305279
VL - 133
SP - 366
EP - 376
JO - BLOOD
JF - BLOOD
SN - 0006-4971
IS - 4
ER -