Evidence map›Paper›PMID 24085769›Full record

ArticleBlood2013

Structure of the factor VIII C2 domain in a ternary complex with 2 inhibitor antibodies reveals classical and nonclassical epitopes.

Justin D Walter, Rachel A Werther, Caileen M Brison, Rebecca K Cragerud, John F Healey, Shannon L Meeks, Pete Lollar, P Clint Spiegel

Open access · greenAbstract read
In one paragraph

Article in Blood, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 23 papers.

0numbers the graph read from it
0cells of the map it votes in
23citing papers in PubMed
2.5field-weighted citation impact, top 11% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

23 citing papers in PubMed, 37 citations in OpenAlex.

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    Review
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4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

8 authors at 2 institutions in 1 country.

Justin D WalterWestern Washington University, Department of Chemistry, Bellingham, WA; and.
Rachel A Werther
Caileen M Brison
Rebecca K Cragerud
John F Healey
Shannon L Meeks
Pete Lollar
P Clint Spiegel
Western Washington University · USCenter for Cancer and Blood Disorders · US

Funding

Translational Research SkillsU54HL112309 · NHLBI · EMORY UNIVERSITY · PI LOLLAR, JOHN S. · 2012 to 2016
$12.1M
STRUCTURE/FUNCTION OF THE FACTOR VIII VWF COMPLEXR01HL040921 · NHLBI · UNIVERSITY OF VERMONT &ST AGRIC COLLEGE · PI LOLLAR, JOHN S. · 1988 to 2010
$2.5M
The Immune Response to Factor VIIIR01HL082609 · NHLBI · EMORY UNIVERSITY · PI LOLLAR, JOHN S. · 2005 to 2010
$2.4M
Mechanisms of Immunogenicity of Factor VIIIK08HL102262 · NHLBI · EMORY UNIVERSITY · PI MEEKS, SHANNON L. · 2010 to 2014
$641k
Structure and Stability Studies of Factor VIII to Overcome the Immune ResponseR15HL103518 · NHLBI · WESTERN WASHINGTON UNIVERSITY · PI SPIEGEL, PAUL CLINTON · 2010 to 2010
$389k
NHLBI NIH HHS K08 HL102262NHLBI NIH HHS R01 HL040921NHLBI NIH HHS R01 HL082609NHLBI NIH HHS R15 HL103518NHLBI NIH HHS U54 HL112309
6 · The paper itself

Abstract

The factor VIII C2 domain is a highly immunogenic domain, whereby inhibitory antibodies develop following factor VIII replacement therapy for congenital hemophilia A patients. Inhibitory antibodies also arise spontaneously in cases of acquired hemophilia A. The structural basis for molecular recognition by 2 classes of anti-C2 inhibitory antibodies that bind to factor VIII simultaneously was investigated by x-ray crystallography. The C2 domain/3E6 FAB/G99 FAB ternary complex illustrates that each antibody recognizes epitopes on opposing faces of the factor VIII C2 domain. The 3E6 epitope forms direct contacts to the C2 domain at 2 loops consisting of Glu2181-Ala2188 and Thr2202-Arg2215, whereas the G99 epitope centers on Lys2227 and also makes direct contacts with loops Gln2222-Trp2229, Leu2261-Ser2263, His2269-Val2282, and Arg2307-Gln2311. Each binding interface is highly electrostatic, with positive charge present on both C2 epitopes and complementary negative charge on each antibody. A new model of membrane association is also presented, where the 3E6 epitope faces the negatively charged membrane surface and Arg2320 is poised at the center of the binding interface. These results illustrate the potential complexities of the polyclonal anti-factor VIII immune response and further define the "classical" and "nonclassical" types of antibody inhibitors against the factor VIII C2 domain.

Indexed as

AntibodiesCrystallography, X-RayElectrochemistryEpitopesFactor VIIIHemophilia AHumansProtein Structure, QuaternaryProtein Structure, TertiaryTernary Complex FactorsAntibodiesEpitopesFactor VIIITernary Complex Factors

Identifiers

PMID24085769
PMCPMC3868927
OpenAlexW2014561247

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.