1T04

Three dimensional structure of a humanized anti-IFN-Gamma Fab in C2 space group

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.217 

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

Literature

Three-dimensional structures of a humanized anti-IFN-gamma Fab (HuZAF) in two crystal forms.

Bourne, P.C., Terzyan, S.S., Cloud, G., Landolfi, N.F., Vasquez, M., Edmundson, A.B.

(2004) Acta Crystallogr.,Sect.D 60: 1761-1769

  • DOI: 10.1107/S0907444904018670
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    • Three-dimensional structures were determined for two crystal forms (orthorhombic P2(1)2(1)2(1) and monoclinic C2) of the Fab from the humanized version of a murine monoclonal antibody (AF2) that possesses binding and potent neutralizing activity agai ...

    Three-dimensional structures were determined for two crystal forms (orthorhombic P2(1)2(1)2(1) and monoclinic C2) of the Fab from the humanized version of a murine monoclonal antibody (AF2) that possesses binding and potent neutralizing activity against human interferon gamma (IFN-gamma). This humanized antibody (HuZAF; USAN name fontolizumab) is currently in phase II clinical trials for the treatment of Crohn's disease. HuZAF exhibits binding and IFN-gamma neutralizing capacities that closely approximate those of the original antibody. It is shown that HuZAF, whose VH domain was designed using a best-sequence-fit approach, is closer structurally to its mouse precursor than is a version whose VH was constructed using a human sequence with lower homology to the original mouse sequence. This work thus offers direct structural evidence in support of the best-sequence-fit approach and adds to previous results of biological and biochemical evaluations of distinctly engineered antibodies that also favored the use of a best-sequence-fit strategy. A second crystal type appeared during attempts to crystallize the Fab-IFN-gamma complex. The antibody-antigen complex that existed in solution dissociated in the crystallization mixture. A conformationally altered but unliganded HuZAF protein crystallized in a different space group (C2), with two Fab molecules in the asymmetric unit. In this crystal lattice, no space was available for accommodating the IFN-gamma antigen. Thus, there are currently three slightly different structures of the HuZAF Fab.

    Organizational Affiliation: 

    Department of Veterinary Pathobiology, Oklahoma State University, Stillwater, OK 74078-2007, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Huzaf Antibody Light Chain
A, C
214N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Huzaf Antibody Heavy Chain
B, D
219N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
PCA
Query on PCA
B, D
L-PEPTIDE LINKINGC5 H7 N O3GLU
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.217 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 82.274α = 90.00
b = 169.805β = 97.68
c = 72.825γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
AMoREphasing
CNSrefinement
DENZOdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-10-05
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance