Membrane-bound factor VIII light chain

Experimental Data Snapshot

  • Resolution: 15.0 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 

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This is version 1.1 of the entry. See complete history


Domain organization of membrane-bound factor VIII.

Stoilova-McPhie, S.Lynch, G.C.Ludtke, S.Pettitt, B.M.

(2013) Biopolymers 99: 448-459

  • DOI: https://doi.org/10.1002/bip.22199
  • Primary Citation of Related Structures:  
    3J2Q, 3J2S

  • PubMed Abstract: 

    Factor VIII (FVIII) is the blood coagulation protein which when defective or deficient causes for hemophilia A, a severe hereditary bleeding disorder. Activated FVIII (FVIIIa) is the cofactor to the serine protease factor IXa (FIXa) within the membrane-bound Tenase complex, responsible for amplifying its proteolytic activity more than 100,000 times, necessary for normal clot formation. FVIII is composed of two noncovalently linked peptide chains: a light chain (LC) holding the membrane interaction sites and a heavy chain (HC) holding the main FIXa interaction sites. The interplay between the light and heavy chains (HCs) in the membrane-bound state is critical for the biological efficiency of FVIII. Here, we present our cryo-electron microscopy (EM) and structure analysis studies of human FVIII-LC, when helically assembled onto negatively charged single lipid bilayer nanotubes. The resolved FVIII-LC membrane-bound structure supports aspects of our previously proposed FVIII structure from membrane-bound two-dimensional (2D) crystals, such as only the C2 domain interacts directly with the membrane. The LC is oriented differently in the FVIII membrane-bound helical and 2D crystal structures based on EM data, and the existing X-ray structures. This flexibility of the FVIII-LC domain organization in different states is discussed in the light of the FVIIIa-FIXa complex assembly and function.

  • Organizational Affiliation

    Department of Neuroscience and Cell Biology, University of Texas Medical Branch, Galveston, TX, USA. svmcphie@utmb.edu

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Coagulation factor VIII light chainA [auth B]642Homo sapiensMutation(s): 0 
Gene Names: F8F8C
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P00451 (Homo sapiens)
Explore P00451 
Go to UniProtKB:  P00451
GTEx:  ENSG00000185010 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00451
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 15.0 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 
EM Software:
TaskSoftware PackageVersion

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-08-28
    Type: Initial release
  • Version 1.1: 2018-07-18
    Changes: Author supporting evidence, Data collection