2F74

Murine MHC class I H-2Db in complex with human b2-microglobulin and LCMV-derived immunodminant peptide gp33


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.223 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural Basis of the Differential Stability and Receptor Specificity of H-2D(b) in Complex with Murine versus Human beta(2)-Microglobulin.

Achour, A.Harris, R.A.Ljunggren, H.G.Schneider, G.Sandalova, T.

(2006) J.Mol.Biol. 356: 382-396

  • DOI: 10.1016/j.jmb.2005.11.068

  • PubMed Abstract: 
  • beta(2)-Microglobulin (beta(2)m) is non-covalently linked to the major histocompatibility complex (MHC) class I heavy chain and interacts with CD8 and Ly49 receptors. Murine MHC class I heavy chains can bind human beta(2)m (hbeta(2)m) and peptide, an ...

    beta(2)-Microglobulin (beta(2)m) is non-covalently linked to the major histocompatibility complex (MHC) class I heavy chain and interacts with CD8 and Ly49 receptors. Murine MHC class I heavy chains can bind human beta(2)m (hbeta(2)m) and peptide, and such hybrid molecules are often used in structural and functional studies. The replacement of mouse beta(2)m (mbeta(2)m) with hbeta(2)m has several functional consequences for MHC class I complex stability and specificity, but the structural basis for this is presently unknown. To investigate the impact of species-specific beta(2)m subunits on MHC class I conformation, we provide a crystallographic comparison of H-2D(b) in complex with LCMV-derived gp33 peptide and either hbeta(2)m or mbeta(2)m. The conformation of the gp33 peptide is not affected by the beta(2)m species. Comparison of the interface between beta(2)m and the alpha(1)alpha(2) domains of the heavy chain in these two crystal structures reveals a marked increase in both polarity and number of hydrogen bonds between hbeta(2)m and the alpha(1)alpha(2) domains of H-2D(b). We propose that the positioning of two hydrogen bond rich regions at the hbeta(2)m/alpha(1)alpha(2) interface plays a central role in the increased overall stability and peptide exchange capacity in the H-2D(b)/hbeta(2)m complex. These two regions act as bridges, holding and stabilizing the underside of the alpha(1) and alpha(2) helices, enabling a prolonged peptide-receptive conformation of the peptide binding cleft. Furthermore, analysis of H-2D(b) in complex with either mbeta(2)m or hbeta(2)m provides a structural explanation for the differential binding of H-2D(b)/hbeta(2)m to both Ly49A and Ly49C. Our comparative structural study emphasizes the importance of beta(2)m residues at positions 3, 6 and 29 for binding to Ly49A and suggests that sterical hindrance by residue K6 on hbeta(2)m impairs the recognition of Ly49C by H-2D(b)/gp33/hbeta(2)m. Finally, comparison of the two H-2D(b) crystal structures implies that the beta(2)m species may affect the strength of TCR recognition by affecting CD8 binding.


    Related Citations: 
    • Structural Basis for LCMV Immune Evasion: Subversion of H-2D b and H-2Kb Presentation of gp33 Revealed by Comparative Crystal Structure Analyses.
      Achour, A.,Michaelsson, J.,Harris, R.A.,Odeberg, J.,Grufman, P.,Sandberg, J.K.,Levitsky, V.,Kaerre, K.,Sandalova, T.,Schneider, G.
      (2002) Immunity 17: 757
    • Determination of structural principles underlying three different modes of lymphocytic choriomeningitis virus escape from CTL recognition.
      Velloso, L.M.,Michaelson, J.,Ljunggren, H.G.,Schneider, G.,Achour, A.
      (2004) J.Immunol. 172: 5504


    Organizational Affiliation

    Center for Infectious Medicine, F59, Department of Medicine, Karolinska Institutet, Karolinska University Hospital in Huddinge, Stockholm, Sweden. adnane.achour@medjs.ki.se




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
H-2 class I histocompatibility antigen, D-B alpha chain
A, D
276Mus musculusMutation(s): 0 
Gene Names: H2-D1
Find proteins for P01899 (Mus musculus)
Go to UniProtKB:  P01899
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Beta-2-microglobulin
B, E
100Homo sapiensMutation(s): 0 
Gene Names: B2M
Find proteins for P61769 (Homo sapiens)
Go to Gene View: B2M
Go to UniProtKB:  P61769
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
NONAMERIC PEPTIDE, GP33, DERIVED FROM LYMPHOCYTIC CHORIOMENINGITIS VIRUS
C, F
9N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.223 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 68.142α = 90.00
b = 65.197β = 102.43
c = 101.941γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
REFMACrefinement
AMoREphasing
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-02-14
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Advisory, Version format compliance
  • Version 1.3: 2018-03-07
    Type: Data collection