3KG5

Crystal structure of human Ig-beta homodimer

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.181 

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This is version 1.1 of the entry. See complete history. 


Literature

Structural and Functional Studies of Igalphabeta and Its Assembly with the B Cell Antigen Receptor.

Radaev, S., Zou, Z., Tolar, P., Nguyen, K., Nguyen, A., Krueger, P.D., Stutzman, N., Pierce, S., Sun, P.D.

(2010) Structure 18: 934-943

  • DOI: 10.1016/j.str.2010.04.019
  • Primary Citation of Related Structures:  
    3KG5, 3KHO, 3KHQ

  • PubMed Abstract: 

    • The B cell antigen receptor (BCR) plays an essential role in all phases of B cell development. Here we show that the extracellular domains of murine and human Igbeta form an I-set immunoglobulin-like structure with an interchain disulfide between cysteines on their G strands ...

    The B cell antigen receptor (BCR) plays an essential role in all phases of B cell development. Here we show that the extracellular domains of murine and human Igbeta form an I-set immunoglobulin-like structure with an interchain disulfide between cysteines on their G strands. Structural and sequence analysis suggests that Igalpha displays a similar fold as Igbeta. An Igalphabeta heterodimer model was generated based on the unique disulfide-bonded Igbeta dimer. Solution binding studies showed that the extracellular domains of Igalphabeta preferentially recognize the constant region of BCR with mu chain specificity, suggesting a role for Igalphabeta to enhance BCRmu chain signaling. Cluster mutations on Igalpha, Igbeta, and a membrane-bound form of immunoglobulin (mIgM) based on the structural model identified distinct areas of potential contacts involving charged residues on both subunits of the coreceptor and the Cmu4 domain of mIgM. These studies provide the first structural model for understanding BCR function.

    Organizational Affiliation: 

    Structural Immunology Section, Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, 12441 Parklawn Drive, Rockville, MD 20852, USA.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
B-cell antigen receptor complex-associated protein beta chain A, B134Homo sapiensMutation(s): 0 
Gene Names: B29, CD79B, IGB
Find proteins for P40259 (Homo sapiens)
Explore P40259 
Go to UniProtKB:  P40259
NIH Common Fund Data Resources
PHAROS:  P40259
GTEx:  ENSG00000007312
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.181 
  • Space Group: P 41 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 129.8α = 90
b = 129.8β = 90
c = 129.8γ = 90
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling
CNSphasing

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

  • Deposited Date: 2009-10-28 
  • Released Date: 2010-08-25 
    • Deposition Author(s): Radaev, S., Sun, P.D.

Revision History  (Full details and data files)

  • Version 1.0: 2010-08-25
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance