3V4U

Structure of a monoclonal antibody complexed with its MHC-I antigen


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.64 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.215 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

The Peptide-receptive transition state of MHC class I molecules: insight from structure and molecular dynamics.

Mage, M.G.Dolan, M.A.Wang, R.Boyd, L.F.Revilleza, M.J.Robinson, H.Natarajan, K.Myers, N.B.Hansen, T.H.Margulies, D.H.

(2012) J Immunol 189: 1391-1399

  • DOI: https://doi.org/10.4049/jimmunol.1200831
  • Primary Citation of Related Structures:  
    3UO1, 3UYR, 3V4U, 3V52

  • PubMed Abstract: 

    MHC class I (MHC-I) proteins of the adaptive immune system require antigenic peptides for maintenance of mature conformation and immune function via specific recognition by MHC-I-restricted CD8(+) T lymphocytes. New MHC-I molecules in the endoplasmic reticulum are held by chaperones in a peptide-receptive (PR) transition state pending release by tightly binding peptides. In this study, we show, by crystallographic, docking, and molecular dynamics methods, dramatic movement of a hinged unit containing a conserved 3(10) helix that flips from an exposed "open" position in the PR transition state to a "closed" position with buried hydrophobic side chains in the peptide-loaded mature molecule. Crystallography of hinged unit residues 46-53 of murine H-2L(d) MHC-I H chain, complexed with mAb 64-3-7, demonstrates solvent exposure of these residues in the PR conformation. Docking and molecular dynamics predict how this segment moves to help form the A and B pockets crucial for the tight peptide binding needed for stability of the mature peptide-loaded conformation, chaperone dissociation, and Ag presentation.


  • Organizational Affiliation

    Molecular Biology Section, Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA. mmage@mail.nih.gov


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ANTI-MHC-I MONOCLONAL ANTIBODY, 64-3-7 H CHAINA [auth H]216Mus musculusMutation(s): 0 
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
ANTI-MHC-I MONOCLONAL ANTIBODY, 64-3-7 L CHAINB [auth L]218Mus musculusMutation(s): 0 
UniProt
Find proteins for A2NHM3 (Mus musculus)
Explore A2NHM3 
Go to UniProtKB:  A2NHM3
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UniProt GroupA2NHM3
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  • Reference Sequence

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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
H-2 class I histocompatibility antigen, L-D alpha chainC [auth P]9Mus musculusMutation(s): 0 
UniProt
Find proteins for P01897 (Mus musculus)
Explore P01897 
Go to UniProtKB:  P01897
Entity Groups  
UniProt GroupP01897
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.64 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.215 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 196.14α = 90
b = 40.643β = 103.07
c = 59.069γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-07-25
    Type: Initial release
  • Version 1.1: 2012-08-01
    Changes: Database references