6NHA

Crystal structure of SYNT001, a human FcRn blocking monoclonal antibody


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.38 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.193 

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Literature

Blocking FcRn in humans reduces circulating IgG levels and inhibits IgG immune complex-mediated immune responses.

Blumberg, L.J.Humphries, J.E.Jones, S.D.Pearce, L.B.Holgate, R.Hearn, A.Cheung, J.Mahmood, A.Del Tito, B.Graydon, J.S.Stolz, L.E.Bitonti, A.Purohit, S.de Graaf, D.Kacena, K.Andersen, J.T.Christianson, G.J.Roopenian, D.C.Hubbard, J.J.Gandhi, A.K.Lasseter, K.Pyzik, M.Blumberg, R.S.

(2019) Sci Adv 5: eaax9586-eaax9586

  • DOI: https://doi.org/10.1126/sciadv.aax9586
  • Primary Citation of Related Structures:  
    6NHA

  • PubMed Abstract: 

    The neonatal crystallizable fragment receptor (FcRn) functions as an intracellular protection receptor for immunoglobulin G (IgG). Recently, several clinical studies have reported the lowering of circulating monomeric IgG levels through FcRn blockade for the potential treatment of autoimmune diseases. Many autoimmune diseases, however, are derived from the effects of IgG immune complexes (ICs). We generated, characterized, and assessed the effects of SYNT001, a FcRn-blocking monoclonal antibody, in mice, nonhuman primates (NHPs), and humans. SYNT001 decreased all IgG subtypes and IgG ICs in the circulation of humans, as we show in a first-in-human phase 1, single ascending dose study. In addition, IgG IC induction of inflammatory pathways was dependent on FcRn and inhibited by SYNT001. These studies expand the role of FcRn in humans by showing that it controls not only IgG protection from catabolism but also inflammatory pathways associated with IgG ICs involved in a variety of autoimmune diseases.


  • Organizational Affiliation

    Syntimmune Inc., Boston, MA 02116, USA.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
IgG receptor FcRn large subunit p51279Homo sapiensMutation(s): 1 
Gene Names: FCGRTFCRN
UniProt & NIH Common Fund Data Resources
Find proteins for P55899 (Homo sapiens)
Explore P55899 
Go to UniProtKB:  P55899
PHAROS:  P55899
GTEx:  ENSG00000104870 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP55899
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-2-microglobulin99Homo sapiensMutation(s): 0 
Gene Names: B2MCDABP0092HDCMA22P
UniProt & NIH Common Fund Data Resources
Find proteins for P61769 (Homo sapiens)
Explore P61769 
Go to UniProtKB:  P61769
PHAROS:  P61769
GTEx:  ENSG00000166710 
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UniProt GroupP61769
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
SYNT001-Fab light chainC [auth L]214Homo sapiensMutation(s): 0 
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  • Reference Sequence
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
SYNT001-Fab heavy chainD [auth H]220Homo sapiensMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.38 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.193 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 64.83α = 90
b = 77.664β = 90
c = 215.605γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data scaling
PDB_EXTRACTdata extraction
HKL-2000data reduction
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Cancer Institute (NIH/NCI)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2019-12-25
    Type: Initial release
  • Version 1.1: 2020-01-15
    Changes: Database references
  • Version 1.2: 2023-10-11
    Changes: Data collection, Database references, Refinement description