2IAD

CLASS II MHC I-AD IN COMPLEX WITH AN INFLUENZA HEMAGGLUTININ PEPTIDE 126-138


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.308 
  • R-Value Work: 0.253 
  • R-Value Observed: 0.253 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal structures of two I-Ad-peptide complexes reveal that high affinity can be achieved without large anchor residues.

Scott, C.A.Peterson, P.A.Teyton, L.Wilson, I.A.

(1998) Immunity 8: 319-329

  • DOI: 10.1016/s1074-7613(00)80537-3
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • We have determined the structures of I-Ad covalently linked to an ovalbumin peptide (OVA323-339) and to an influenza virus hemagglutinin peptide (HA126-138). The floor of the peptide-binding groove contains an unusual beta bulge, not seen in I-E and ...

    We have determined the structures of I-Ad covalently linked to an ovalbumin peptide (OVA323-339) and to an influenza virus hemagglutinin peptide (HA126-138). The floor of the peptide-binding groove contains an unusual beta bulge, not seen in I-E and DR structures, that affects numerous interactions between the alpha and beta chains and bound peptide. Unlike other MHC-peptide complexes, the peptides do not insert any large anchor residues into the binding pockets of the shallow I-Ad binding groove. The previously identified six-residue "core" binding motif of I-Ad occupies only the P4 to P9 pockets, implying that specificity of T cell receptor recognition of I-Ad-peptide complexes can be accomplished by peptides that only partially fill the MHC groove.


    Related Citations: 
    • Engineering Protein for X-Ray Crystallography: The Murine Major Histocompatibility Complex Class II Molecule I-Ad
      Scott, C.A., Garcia, K.C., Stura, E.A., Peterson, P.A., Wilson, I.A., Teyton, L.
      (1998) Protein Sci 7: 413
    • Role of Chain Pairing for the Production of Functional Soluble Ia Major Histocompatibility Complex Class II Molecules
      Scott, C.A., Garcia, K.C., Carbone, F.R., Wilson, I.A., Teyton, L.
      (1996) J Exp Med 183: 2087

    Organizational Affiliation

    Department of Molecular Biology, The Scripps Research Institute, La Jolla, California 92037, USA.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MHC CLASS II I-ADA194Mus musculusMutation(s): 0 
Gene Names: H2-Aa
Find proteins for P04228 (Mus musculus)
Explore P04228 
Go to UniProtKB:  P04228
Protein Feature View
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  • Reference Sequence

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
MHC CLASS II I-ADB205Mus musculusMutation(s): 0 
Gene Names: H2-Ab1
Find proteins for P01921 (Mus musculus)
Explore P01921 
Go to UniProtKB:  P01921
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.308 
  • R-Value Work: 0.253 
  • R-Value Observed: 0.253 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 127.2α = 90
b = 100.2β = 100.3
c = 53.1γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing
X-PLORrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-11-18
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance