3G6D

Crystal structure of the complex between CNTO607 Fab and IL-13

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.213 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history. 

Literature

Epitope mapping of anti-interleukin-13 neutralizing antibody CNTO607.

Teplyakov, A., Obmolova, G., Wu, S.J., Luo, J., Kang, J., O'Neil, K., Gilliland, G.L.

(2009) J.Mol.Biol. 389: 115-123

  • DOI: 10.1016/j.jmb.2009.03.076
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    • CNTO607 is a neutralizing anti-interleukin-13 (IL-13) human monoclonal antibody obtained from a phage display library. To determine how this antibody inhibits the biological effect of IL-13, we determined the binding epitope by X-ray crystallography. ...

    CNTO607 is a neutralizing anti-interleukin-13 (IL-13) human monoclonal antibody obtained from a phage display library. To determine how this antibody inhibits the biological effect of IL-13, we determined the binding epitope by X-ray crystallography. The crystal structure of the complex between CNTO607 Fab and IL-13 reveals the antibody epitope at the surface formed by helices A and D of IL-13. This epitope overlaps with the IL-4Ralpha/IL-13Ralpha1 receptor-binding site, which explains the neutralizing effect of CNTO607. The extensive antibody interface covers an area of 1000 A(2), which is consistent with the high binding affinity. The key features of the interface are the charge and shape complementarity of the molecules that include two hydrophobic pockets on IL-13 that accommodate Phe32 [complementarity-determining region (CDR) L2] and Trp100a (CDR H3) and a number of salt bridges between basic residues of IL-13 and acidic residues of the antibody. Comparison with the structure of the free Fab shows that the CDR residues do not change their conformation upon complex formation, with the exception of two residues in CDR H3, Trp100a and Asp100b, which change rotamer conformations. To evaluate the relative contribution of the epitope residues to CNTO607 binding, we performed alanine-scanning mutagenesis of the A-D region of IL-13. This study confirmed the primary role of electrostatic interactions for antigen recognition.

    Organizational Affiliation: 

    Centocor R&D, Inc., Radnor, PA 19087, USA. ateplyak@its.jnj.com




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CNTO607 Fab Light chain
L
213N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
CNTO607 Fab Heavy chain
H
229N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Interleukin-13
A
113Homo sapiensMutation(s): 0 
Gene Names: IL13 (NC30)
Find proteins for P35225 (Homo sapiens)
Go to Gene View: IL13
Go to UniProtKB:  P35225
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4
Download SDF File 
Download CCD File 
H
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.213 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 66.540α = 90.00
b = 68.030β = 90.00
c = 182.350γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
d*TREKdata reduction
d*TREKdata scaling

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-04-07
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2012-05-30
    Type: Database references