Mutational constraints on local unfolding inhibit the rheological adaptation of von willebrand factor

Alexander Tischer, James C. Campbell, Venkata R. Machha, Laurie Moon-Tasson, Linda M. Benson, Banumathi Sankaran, Choel Kim, Matthew T Auton

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Unusually large von Willebrand factor (VWF), the first responder to vascular injury in primary hemostasis, is designed to capture platelets under the high shear stress of rheological blood flow. In type 2M von Willebrand disease, two rare mutations (G1324A and G1324S) within the platelet GPIbα binding interface of the VWF A1 domain impair the hemostatic function of VWF. We investigate structural and conformational effects of these mutations on the A1 domain's efficacy to bind collagen and adhere platelets under shear flow. These mutations enhance the thermodynamic stability, reduce the rate of unfolding, and enhance the A1 domain's resistance to limited proteolysis. Collagen binding affinity is not significantly affected indicating that the primary stabilizing effect of these mutations is to diminish the platelet binding efficiency under shear flow. The enhanced stability stems from the steric consequences of adding a side chain (G1324A) and additionally a hydrogen bond (G1324S) to His1322 across the β2-β3 hairpin in the GPIbα binding interface, which restrains the conformational degrees of freedom and the overall flexibility of the native state. These studies reveal a novel rheological strategy in which the incorporation of a single glycine within the GPIbα binding interface of normal VWF enhances the probability of local unfolding that enables the A1 domain to conformationally adapt to shear flow while maintaining its overall native structure.

Original languageEnglish (US)
Pages (from-to)3848-3859
Number of pages12
JournalJournal of Biological Chemistry
Volume291
Issue number8
DOIs
StatePublished - Feb 19 2016

Fingerprint

von Willebrand Factor
Platelets
Blood Platelets
Shear flow
Mutation
Collagen
Type 2 von Willebrand Disease
Proteolysis
Vascular System Injuries
Hemostatics
Hemostasis
Thermodynamics
Glycine
Shear stress
Hydrogen
Hydrogen bonds
Thermodynamic stability
Blood

ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Cite this

Mutational constraints on local unfolding inhibit the rheological adaptation of von willebrand factor. / Tischer, Alexander; Campbell, James C.; Machha, Venkata R.; Moon-Tasson, Laurie; Benson, Linda M.; Sankaran, Banumathi; Kim, Choel; Auton, Matthew T.

In: Journal of Biological Chemistry, Vol. 291, No. 8, 19.02.2016, p. 3848-3859.

Research output: Contribution to journalArticle

Tischer, A, Campbell, JC, Machha, VR, Moon-Tasson, L, Benson, LM, Sankaran, B, Kim, C & Auton, MT 2016, 'Mutational constraints on local unfolding inhibit the rheological adaptation of von willebrand factor', Journal of Biological Chemistry, vol. 291, no. 8, pp. 3848-3859. https://doi.org/10.1074/jbc.M115.703850
Tischer, Alexander ; Campbell, James C. ; Machha, Venkata R. ; Moon-Tasson, Laurie ; Benson, Linda M. ; Sankaran, Banumathi ; Kim, Choel ; Auton, Matthew T. / Mutational constraints on local unfolding inhibit the rheological adaptation of von willebrand factor. In: Journal of Biological Chemistry. 2016 ; Vol. 291, No. 8. pp. 3848-3859.
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