3UX9

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

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.186 

wwPDB Validation   3D Report Full Report


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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 (Berl) 

  • DOI: 10.1007/s00109-012-0866-3
  • Primary Citation of Related Structures:  
    3UX9

  • 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 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 ...

    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
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Interferon alpha-1/13 A, C169Homo sapiensMutation(s): 0 
Gene Names: IFNA1, IFNA13
Find proteins for P01562 (Homo sapiens)
Explore P01562 
Go to UniProtKB:  P01562
NIH Common Fund Data Resources
PHAROS:  P01562
GTEx:  ENSG00000197919ENSG00000233816
Protein Feature View
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  • Reference Sequence
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(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
ScFv antibody B, D256Homo sapiensMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.186 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 236.225α = 90
b = 91.945β = 99.75
c = 43.633γ = 90
Software Package:
Software NamePurpose
HKL-3000data collection
BALBESphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

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