1KLU

Crystal structure of HLA-DR1/TPI(23-37) complexed with staphylococcal enterotoxin C3 variant 3B2 (SEC3-3B2)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.93 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.208 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Minor structural changes in a mutated human melanoma antigen correspond to dramatically enhanced stimulation of a CD4+ tumor-infiltrating lymphocyte line.

Sundberg, E.J.Sawicki, M.W.Southwood, S.Andersen, P.S.Sette, A.Mariuzza, R.A.

(2002) J.Mol.Biol. 319: 449-461

  • DOI: 10.1016/S0022-2836(02)00370-4
  • Primary Citation of Related Structures:  1KLG

  • PubMed Abstract: 
  • While most immunotherapies for cancer have focused on eliciting specific CD8+ cytotoxic T lymphocyte killing of tumor cells, a mounting body of evidence suggests that stimulation of anti-tumor CD4+ T cell help may be required for highly effective the ...

    While most immunotherapies for cancer have focused on eliciting specific CD8+ cytotoxic T lymphocyte killing of tumor cells, a mounting body of evidence suggests that stimulation of anti-tumor CD4+ T cell help may be required for highly effective therapy. Several MHC class II-restricted tumor antigens that specifically activate such CD4+ helper T lymphocytes have now been identified, including one from a melanoma tumor that is caused by a single base-pair mutation in the glycolytic enzyme triosephosphate isomerase. This mutation results in the conversion of a threonine residue to isoleucine within the antigenic epitope, concomitant with a greater than five log-fold increase in stimulation of a CD4+ tumor-infiltrating lymphocyte line. Here, we present the crystal structures of HLA-DR1 in complex with both wild-type and mutant TPI peptide antigens, the first structures of tumor peptide antigen/MHC class II complexes recognized by CD4+ T cells to be reported. These structures show that very minor changes in the binding surface for T cell receptor correspond to the dramatic differences in T cell stimulation. Defining the structural basis by which CD4+ T cell help is invoked in an anti-tumor immune response will likely aid the design of more effective cancer immunotherapies.


    Related Citations: 
    • Biochemical identification of a mutated human melanoma antigen recognized by CD4+ T cells
      Pieper, R.,Christian, R.E.,Gonzales, M.I.,Nishimura, M.I.,Gupta, G.,Settlage, R.E.,Shabanowitz, J.,Rosenberg, S.A.,Hunt, D.F.,Topalian, S.L.
      (1999) J.Exp.Med. 189: 757


    Organizational Affiliation

    Center for Advanced Research in Biotechnology, W. M. Keck Laboratory for Structural Biology, University of Maryland Biotechnology Institute, 9600 Gudelsky Drive, Rockville, MD 20850, USA. sundberg@umbi.umd.edu




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HLA CLASS II HISTOCOMPATIBILITY ANTIGEN, DR ALPHA CHAIN
A
179Homo sapiensGene Names: HLA-DRA (HLA-DRA1)
Find proteins for P01903 (Homo sapiens)
Go to Gene View: HLA-DRA
Go to UniProtKB:  P01903
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
HLA CLASS II HISTOCOMPATIBILITY ANTIGEN, DR-1 BETA CHAIN
B
190Homo sapiensGene Names: HLA-DRB1
Find proteins for P04229 (Homo sapiens)
Go to Gene View: HLA-DRB1
Go to UniProtKB:  P04229
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Triosephosphate isomerase peptide
C
15Homo sapiensGene Names: TPI1 (TPI)
EC: 5.3.1.1
Find proteins for P60174 (Homo sapiens)
Go to Gene View: TPI1
Go to UniProtKB:  P60174
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
ENTEROTOXIN TYPE C-3
D
239Staphylococcus aureusGene Names: entC3
Find proteins for P0A0L5 (Staphylococcus aureus)
Go to UniProtKB:  P0A0L5
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.93 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.208 
  • Space Group: H 3
Unit Cell:
Length (Å)Angle (°)
a = 171.296α = 90.00
b = 171.296β = 90.00
c = 121.024γ = 120.00
Software Package:
Software NamePurpose
CNSrefinement
SCALEPACKdata scaling
DENZOdata reduction
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-08-02
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance