Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 49.40 kDa 
• Atom Count: 3840 
• Modelled Residue Count: 450 
• Deposited Residue Count: 450 
• Unique protein chains: 2

3MBX

Crystal structure of chimeric antibody X836

• DOI: 10.2210/pdb3MBX/pdb

• Classification: IMMUNE SYSTEM
• Organism(s): Mus musculus, Homo sapiens
• Expression System: Homo sapiens
• Mutation(s): No 


• Deposited: 2010-03-26 Released: 2010-06-30 
• Deposition Author(s): Teplyakov, A., Obmolova, G., Gilliland, G.L.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.232 
• R-Value Work: 0.210 
• R-Value Observed: 0.211 

Literature

On the domain pairing in chimeric antibodies.

Teplyakov, A., Obmolova, G., Carton, J.M., Gao, W., Zhao, Y., Gilliland, G.L.

(2010) Mol Immunol 47: 2422-2426

• PubMed: 20554002 
• DOI: 10.1016/j.molimm.2010.05.002
• Primary Citation of Related Structures:  
  3MBX


• PubMed Abstract: 
  

A chimeric antibody was constructed from two unrelated antibodies by combining their heavy and light chains. The "double chimera" consists of the mouse variable regions of different specificity (IL-13 and EMMPRIN) and the constant regions of different origin (mouse and human). The Fab fragment of this chimeric antibody was expressed in mammalian cells, and the crystal structure was determined at 1.6A resolution. Despite a large number of amino acid substitutions in the double chimera with respect to the parent antibodies, the heavy and light chains associate into a stable molecule. Comparison to the structure of one of the parent antibodies reveals that the variable domain interface, as well as the conformation of antigen-binding loops, is preserved without major rearrangements due to conservation of amino acids in key positions. Comparison to the structures of the all-human and all-mouse constant domains indicates a remarkable plasticity of the inter-chain interface that can tolerate residue relocations of up to 6A.

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Organizational Affiliation: 

Centocor R&D, Inc., 145 King of Prussia Road, Radnor, PA 19087, USA. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
X836 LIGHT CHAIN	A [auth L]	220	Mus musculus	Mutation(s): 0

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
X836 HEAVY CHAIN	B [auth H]	230	Mus musculus, Homo sapiens This entity is chimeric	Mutation(s): 0

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PO4	D [auth H]	PHOSPHATE ION O4 P NBIIXXVUZAFLBC-UHFFFAOYSA-K
NA	C [auth L]	SODIUM ION Na FKNQFGJONOIPTF-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
PCA	B [auth H]	L-PEPTIDE LINKING	C5 H7 N O3		GLN

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.232 
• R-Value Work: 0.210 
• R-Value Observed: 0.211 
• Space Group: I 2 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 86.93	α = 90
b = 99.84	β = 90
c = 125.33	γ = 90

Software Package:

Software Name	Purpose
CrystalClear	data collection
MOLREP	phasing
REFMAC	refinement
d*TREK	data reduction
d*TREK	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2010-03-26 
• Released Date: 2010-06-30 
Deposition Author(s): Teplyakov, A., Obmolova, G., Gilliland, G.L.

Revision History  

• Version 1.0: 2010-06-30
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 2.0: 2019-12-25
  Changes: Derived calculations, Polymer sequence