3KG5

Crystal structure of human Ig-beta homodimer


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.181 

wwPDB Validation 3D Report Full Report


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:  

  • 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 cys ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
B-cell antigen receptor complex-associated protein beta chain
A, B
134Homo sapiensMutation(s): 0 
Gene Names: CD79B (B29, IGB)
Find proteins for P40259 (Homo sapiens)
Go to Gene View: CD79B
Go to UniProtKB:  P40259
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.181 
  • Space Group: P 41 3 2
Unit Cell:
Length (Å)Angle (°)
a = 129.800α = 90.00
b = 129.800β = 90.00
c = 129.800γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data reduction
CNSphasing
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

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

Revision History 

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