2MHQ: Solution structure of the major factor VIII binding region on von Willebrand factor

Although much of the function of von Willebrand factor (VWF) has been revealed, detailed insight into the molecular structure that enables VWF to orchestrate hemostatic processes, in particular factor VIII (FVIII) binding and stabilization in plasma, is lacking. Here, we present the high-resolution solution structure and structural dynamics of the D' region of VWF, which constitutes the major FVIII binding site. D' consists of 2 domains, trypsin-inhibitor-like (TIL') and E', of which the TIL' domain lacks extensive secondary structure, is strikingly dynamic and harbors a cluster of pathological mutations leading to decreased FVIII binding affinity (type 2N von Willebrand disease [VWD]). This indicates that the backbone malleability of TIL' is important for its biological activity. The principal FVIII binding site is localized to a flexible, positively charged region on TIL', which is supported by the rigid scaffold of the TIL' and E' domain beta sheets. Furthermore, surface-charge mapping of the TIL'E' structure reveals a potential mechanism for the electrostatically guided, high-affinity VWFFVIII interaction. Our findings provide novel insights into VWFFVIII complex formation, leading to a greater understanding of the molecular basis of the bleeding diathesis type 2N VWD.
PDB ID: 2MHQDownload
MMDB ID: 119290
PDB Deposition Date: 2013/12/2
Updated in MMDB: 2018/05
Experimental Method:
solution nmr
Source Organism:
Similar Structures:
Biological Unit for 2MHQ: monomeric; determined by author
Molecular Components in 2MHQ
Label Count Molecule
Protein (1 molecule)
VON Willebrand Factor(Gene symbol: VWF)
Molecule annotation
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Citing MMDB