{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T12:43:15Z","timestamp":1790772195374,"version":"4.1.0"},"reference-count":70,"publisher":"American Society of Hematology","issue":"21","content-domain":{"domain":["ashpublications.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2021,5,27]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Interaction of factor VIII (FVIII) with von Willebrand factor (VWF) is mediated by the VWF D\u2032D3 domains and thrombin-mediated release is essential for hemostasis after vascular injury. VWF-D\u2032D3 mutations resulting in loss of FVIII binding are the underlying cause of von Willebrand disease (VWD) type 2N. Furthermore, the FVIII\u2013VWF interaction has significant implications for the development of therapeutics for bleeding disorders, particularly hemophilia A, in which endogenous VWF clearance imposes a half-life ceiling on replacement FVIII therapy. To understand the structural basis of FVIII engagement by VWF, we solved the structure of BIVV001 by cryo-electron microscopy to 2.9 \u00c5 resolution. BIVV001 is a bioengineered clinical-stage FVIII molecule for the treatment of hemophilia A. In BIVV001, VWF-D\u2032D3 is covalently linked to an Fc domain of a B domain\u2013deleted recombinant FVIII (rFVIII) Fc fusion protein, resulting in a stabilized rFVIII\/VWF-D\u2032D3 complex. Our rFVIII\/VWF structure resolves BIVV001 architecture and provides a detailed spatial understanding of previous biochemical and clinical observations related to FVIII\u2013VWF engagement. Notably, the FVIII acidic a3 peptide region (FVIII-a3), established as a critical determinant of FVIII\/VWF complex formation, inserts into a basic groove formed at the VWF\u2013D\u2032\/rFVIII interface. Our structure shows direct interaction of sulfated Y1680 in FVIII-a3 and VWF-R816 that, when mutated, leads to severe hemophilia A or VWD type 2N, respectively. These results provide insight on this key coagulation complex, explain the structural basis of many hemophilia A and VWD type 2N mutations, and inform studies to further elucidate how VWF dissociates rapidly from FVIII upon activation.<\/jats:p>","DOI":"10.1182\/blood.2020009197","type":"journal-article","created":{"date-parts":[[2021,2,11]],"date-time":"2021-02-11T03:35:27Z","timestamp":1613014527000},"page":"2970-2980","update-policy":"https:\/\/doi.org\/10.1182\/blood.2019cm0000","source":"Crossref","is-referenced-by-count":54,"title":["Molecular determinants of the factor VIII\/von Willebrand factor complex revealed by BIVV001 cryo-electron microscopy"],"prefix":"10.1182","volume":"137","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9029-0923","authenticated-orcid":false,"given":"James R.","family":"Fuller","sequence":"first","affiliation":[{"name":"Integrated Drug Discovery, Sanofi, Waltham, MA;"},{"name":"Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, IL; and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kevin E.","family":"Knockenhauer","sequence":"additional","affiliation":[{"name":"Rare Blood Disorders, Sanofi, Waltham, MA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0331-4323","authenticated-orcid":false,"given":"Nina C.","family":"Leksa","sequence":"additional","affiliation":[{"name":"Rare Blood Disorders, Sanofi, Waltham, MA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1442-3907","authenticated-orcid":false,"given":"Robert T.","family":"Peters","sequence":"additional","affiliation":[{"name":"Rare Blood Disorders, Sanofi, Waltham, MA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9701-9255","authenticated-orcid":false,"given":"Joseph D.","family":"Batchelor","sequence":"additional","affiliation":[{"name":"Integrated Drug Discovery, Sanofi, Waltham, MA;"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"234","reference":[{"issue":"5","key":"2021052715231105000_B1","doi-asserted-by":"crossref","first-page":"343","DOI":"10.1016\/S0049-3848(99)00123-1","article-title":"Effect of von Willebrand factor and its proteolytic fragments on kinetics of interaction between the light and heavy chains of human factor VIII","volume":"96","author":"Saenko","year":"1999","journal-title":"Thromb Res"},{"issue":"2","key":"2021052715231105000_B2","doi-asserted-by":"crossref","first-page":"390","DOI":"10.1172\/JCI108788","article-title":"Stabilization of factor VIII in plasma by the von Willebrand factor. 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