3UX9

Structural insights into a human anti-IFN antibody exerting therapeutic potential for systemic lupus erythematosus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.183 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Structural insights into a human anti-IFN antibody exerting therapeutic potential for systemic lupus erythematosus

Ouyang, S.Gong, B.Li, J.-Z.Zhao, L.-X.Wu, W.Zhang, F.-S.Sun, L.Wang, S.-J.Pan, M.Li, C.Liang, W.Shaw, N.Zheng, J.Zhao, G.-P.Wang, Y.Liu, Z.-J.Liang, M.-F.

(2012) J.Mol.Med. --: --

  • DOI: 10.1007/s00109-012-0866-3

  • PubMed Abstract: 
  • Increasing evidences suggest that the type I interferon α (IFN α) plays a critical role in the etiopathogenesis of systemic lupus erythematosus (SLE), which makes it a promising therapeutic target for the treatment of the disease. By screening a larg ...

    Increasing evidences suggest that the type I interferon α (IFN α) plays a critical role in the etiopathogenesis of systemic lupus erythematosus (SLE), which makes it a promising therapeutic target for the treatment of the disease. By screening a large size non-immune human antibody library, we have developed a human single-chain antibody (ScFv) AIFN α 1bScFv01 and corresponding whole antibody AIFN α 1bIgG01 to human interferon α 1b (IFN α 1b) with high specificity and high affinity. The IgG antibody could down-regulate the expression of ISG15 and IFIT-1 induced by either recombinant IFN α 1b or naïve IFN α from SLE patients' sera, and reduced total serum IgG and IgM antibodies level in a pristane-primed lupus-like mouse model. The crystal structure of AIFN α 1bScFv01-IFN α 1b complex solved to 2.8 Å resolution revealed that both Pro26-Gln40 region in loop AB and Glu147-Arg150 region in helix E of IFN α 1b contribute to binding with AIFN α 1bScFv01. Four residues of above two regions (Leu30, Asp32, Asp35 and Arg150) are critical for the formation of antigen-antibody complexes. AIFN α 1bScFv01 shares partial epitopes of IFN α 1b with its receptor IFNAR2 but with much higher binding affinity to IFN α 1b than IFNAR2. Thus, AIFN α 1bIgG01 exhibits its neutralizing activity through competition with IFNAR2 to bind with IFN α and prevents the activation of IFN α-mediated signaling pathway. Our results highlight the potential use of the human antibody for modulating the activity of IFN α in SLE.


    Organizational Affiliation

    National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Interferon alpha-1/13
A, C
169Homo sapiensMutation(s): 0 
Gene Names: IFNA1, IFNA13
Find proteins for P01562 (Homo sapiens)
Go to Gene View: IFNA1 IFNA13
Go to UniProtKB:  P01562
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
ScFv antibody
B, D
256N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.183 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 236.225α = 90.00
b = 91.945β = 99.75
c = 43.633γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
HKL-3000data collection
PHENIXrefinement
BALBESphasing
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-02-29
    Type: Initial release