Biological Assembly 1  

 3D View: Structure | Electron Density

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

Biological assembly 1 assigned by authors.

Biological Assembly 2  

 3D View: Structure | Electron Density

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

Biological assembly 2 assigned by authors.

Macromolecule Content

• Total Structure Weight: 99.15 kDa 
• Atom Count: 6628 
• Residue Count: 848 
• Unique protein chains: 2

3OED

The structure of the complex between complement receptor CR2 and its ligand complement fragment C3d

• DOI: 10.2210/pdb3OED/pdb

• Classification: IMMUNE SYSTEM
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21
• Mutation(s): Yes 


• Deposited: 2010-08-12 Released: 2011-05-11 
• Deposition Author(s): Isenman, D.E., van den Elsen, J.M.H.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.16 Å
• R-Value Free: 0.259 
• R-Value Work: 0.189 

Literature

A crystal structure of the complex between human complement receptor 2 and its ligand C3d.

van den Elsen, J.M., Isenman, D.E.

(2011) Science 332: 608-611

• PubMed: 21527715 
• DOI: 10.1126/science.1201954
• Primary Citation of Related Structures:  
  3OED


• PubMed Abstract: 
  

The interaction of complement receptor 2 (CR2)--which is present on B cells and follicular dendritic cells--with its antigen-bound ligand C3d results in an enhanced antibody response, thus providing an important link between the innate and adaptive immune systems. Although a cocrystal structure of a complex between C3d and the ligand-binding domains of CR2 has been published, several aspects of this structure, including the position in C3d of the binding interface, remained controversial because of disagreement with biochemical data. We now report a cocrystal structure of a CR2(SCR1-2):C3d complex at 3.2 angstrom resolution in which the interaction interfaces differ markedly from the previously published structure and are consistent with the biochemical data. It is likely that, in the previous structure, the interaction was influenced by the presence of zinc acetate additive in the crystallization buffer, leading to a nonphysiological complex. Detailed knowledge of the binding interface now at hand gives the potential to exploit the interaction in vaccine design or in therapeutics directed against autoreactive B cells.

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Organizational Affiliation: 

Department of Biology and Biochemistry, University of Bath, Bath BA2 7AY, UK. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Complement C3	A, B	310	Homo sapiens	Mutation(s): 1  Gene Names: C3, CPAMD1
Find proteins for P01024 (Homo sapiens) Explore P01024  Go to UniProtKB:  P01024
NIH Common Fund Data Resources
PHAROS:  P01024 GTEx:  ENSG00000125730

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Complement receptor type 2	C, D	135	Homo sapiens	Mutation(s): 0  Gene Names: C3DR, CR2
Find proteins for P20023 (Homo sapiens) Explore P20023  Go to UniProtKB:  P20023
NIH Common Fund Data Resources
PHAROS:  P20023 GTEx:  ENSG00000117322

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.16 Å
• R-Value Free: 0.259 
• R-Value Work: 0.189 
• Space Group: H 3 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 146.12	α = 90
b = 146.12	β = 90
c = 253.06	γ = 120

Software Package:

Software Name	Purpose
ADSC	data collection
BALBES	phasing
REFMAC	refinement
HKL-2000	data reduction
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2010-08-12 
• Released Date: 2011-05-11 
Deposition Author(s): Isenman, D.E., van den Elsen, J.M.H.

Revision History 

• Version 1.0: 2011-05-11
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2012-03-28
  Changes: Database references