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Related Experiment Video

Updated: May 29, 2026

Helical Organization of Blood Coagulation Factor VIII on Lipid Nanotubes
12:24

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Published on: June 3, 2014

Structural determination of lipid-bound factor VIII.

Bassem M Mohammed1

  • 1Edward A. Doisy Department of Biochemistry and Molecular Biology, Saint Louis University School of Medicine, St Louis, Missouri, USA.

Journal of Thrombosis and Haemostasis : JTH
|May 27, 2026
PubMed
Summary
This summary is machine-generated.

This study reveals the structure of coagulation factor VIII (FVIII) bound to membranes, clarifying its role in blood clotting. Methylated lipids enabled high-resolution cryo-EM, defining the FVIII-lipid interface for future tenase complex research.

Keywords:
cryoelectron microscopyfactor VIIIhemophilia Amembranesphospholipids

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Published on: September 9, 2012

Area of Science:

  • Structural Biology
  • Biochemistry
  • Hemostasis

Background:

  • Coagulation factor VIII (FVIII) is crucial for blood clotting, but its membrane interactions are poorly understood.
  • Existing methods for studying membrane-bound proteins face limitations in resolution and reproducibility.
  • Understanding the FVIII-lipid interface is key to elucidating the intrinsic tenase complex assembly.

Purpose of the Study:

  • To develop a robust method for determining the structure of membrane-bound coagulation factors.
  • To resolve the precise interaction between procofactor FVIII and lipid membranes.
  • To provide a structural basis for understanding FVIII's function in hemostasis.

Main Methods:

  • Utilized methylated branched lipids to create a more suitable membrane environment.
  • Employed cryo-electron microscopy (cryo-EM) for high-resolution structural determination.
  • Applied nanodisc and liposome platforms for FVIII-lipid complex formation.

Main Results:

  • Achieved high-resolution cryo-EM structures of FVIII bound to nanodiscs and liposomes (3.46-3.56 Å).
  • Identified a tilted docking orientation of FVIII at the membrane interface.
  • Revealed that both C domains interact with the membrane, with C2 as the primary anchor and C1 as a secondary tether.

Conclusions:

  • Methylated branched lipids facilitate rapid, high-resolution analysis of membrane-associated clotting factors.
  • The determined structure offers the first definitive model of the FVIII-lipid interface.
  • This structural insight serves as a benchmark for future studies on tenase complex assembly and FVIII function.