1FBI

CRYSTAL STRUCTURE OF A CROSS-REACTION COMPLEX BETWEEN FAB F9.13.7 AND GUINEA-FOWL LYSOZYME


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Work: 0.190 

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This is version 1.2 of the entry. See complete history

Literature

Crystal structure of a cross-reaction complex between Fab F9.13.7 and guinea fowl lysozyme.

Lescar, J.Pellegrini, M.Souchon, H.Tello, D.Poljak, R.J.Peterson, N.Greene, M.Alzari, P.M.

(1995) J.Biol.Chem. 270: 18067-18076


  • PubMed Abstract: 
  • The crystal structure of the complex between the cross-reacting antigen Guinea fowl lysozyme and the Fab from monoclonal antibody F9.13.7, raised against hen egg lysozyme, has been determined by x-ray diffraction to 3-A resolution. The antibody inter ...

    The crystal structure of the complex between the cross-reacting antigen Guinea fowl lysozyme and the Fab from monoclonal antibody F9.13.7, raised against hen egg lysozyme, has been determined by x-ray diffraction to 3-A resolution. The antibody interacts with exposed residues of an alpha-helix and surrounding loops adjacent to the lysozyme active site cleft. The epitope of lysozyme bound by antibody F9.13.7 overlaps almost completely with that bound by antibody HyHEL10; the same 12 residues of the antigen interact with the two antibodies. The antibodies, however, have different combining sites with no sequence homology at any of their complementarity-determining regions and show a dissimilar pattern of cross-reactivity with heterologous antigens. Side chain mobility of epitope residues contributes to confer steric and electrostatic complementarity to differently shaped combining sites, allowing functional mimicry to occur. The capacity of two antibodies that have different fine specificities to bind the same area of the antigen emphasizes the operational character of the definition of an antigenic determinant. This example demonstrates that degenerate binding of the same structural motif does not require the existence of sequence homology or other chemical similarities between the different binding sites.


    Related Citations: 
    • Crystal Structures of Pheasant and Guinea-Fowl Egg-White Lysozymes
      Lescar, J.,Souchon, H.,Alzari, P.
      (1994) Protein Sci. 3: 788
    • Crystallization, Preliminary X-Ray Diffraction Study, and Crystal Packing of a Complex between Anti-Hen Lysozyme Antibody and Guinea-Fowl Lysozyme
      Lescar, J.,Riottot, M.-M.,Souchon, H.,Chitarra, V.,Bentley, G.,Navaza, J.,Alzari, P.,Poljak, R.
      (1993) Proteins 15: 209


    Organizational Affiliation

    Unité d'Immunologie Structurale, Institut Pasteur, Paris, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
IGG1 F9.13.7 FAB (LIGHT CHAIN)
L, P
214Mus musculusN/A
Find proteins for P01837 (Mus musculus)
Go to UniProtKB:  P01837
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
IGG1 F9.13.7 FAB (HEAVY CHAIN)
H, Q
221Mus musculusGene Names: Ighg1 (Igh-4)
Find proteins for P01868 (Mus musculus)
Go to UniProtKB:  P01868
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
GUINEA FOWL LYSOZYME
X, Y
129Numida meleagrisGene Names: LYZ
EC: 3.2.1.17
Find proteins for P00704 (Numida meleagris)
Go to Gene View: LYZ
Go to UniProtKB:  P00704
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Work: 0.190 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 83.700α = 90.00
b = 195.500β = 108.50
c = 50.200γ = 90.00
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1995-02-27
    Type: Initial release
  • Version 1.1: 2008-03-21
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance