Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Standalone Viewers  
Protein Workshop | Ligand Explorer

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

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

Macromolecule Content

• Total Structure Weight: 49399.85 
• Atom Count: 3509 
• Residue Count: 450 
• Unique protein chains: 2

3MBX

Crystal structure of chimeric antibody X836

• DOI: 10.2210/pdb3MBX/pdb

• Classification: IMMUNE SYSTEM
• Expression System: Homo sapiens


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

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.6 Å
• R-Value Free: 0.232 
• R-Value Work: 0.210 

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


• 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.

---

Organizational Affiliation: 

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

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
X836 LIGHT CHAIN	L	220	N/A	Mutation(s): 0
Protein Feature View is not available: No corresponding UniProt sequence found.

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
X836 HEAVY CHAIN	H	230	N/A	Mutation(s): 0
Protein Feature View is not available: No corresponding UniProt sequence found.

Small Molecules

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

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
PCA	H	L-PEPTIDE LINKING	C5 H7 N O3		GLU

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.6 Å
• R-Value Free: 0.232 
• R-Value Work: 0.210 
• Space Group: I 2 2 2

Unit Cell:

Length (Å)	Angle (°)
a = 86.930	α = 90.00
b = 99.840	β = 90.00
c = 125.330	γ = 90.00

Software Package:

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

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
  Type: Version format compliance