Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - A1B1C1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly 2  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - A1B1C1 

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 91.50 kDa 
• Atom Count: 7378 
• Residue Count: 768 
• Unique protein chains: 3

1TVB

Crystal structure of Melanoma Antigen gp100(209-217) Bound to Human Class I MHC HLA-A2

• DOI: 10.2210/pdb1TVB/pdb

• Classification: IMMUNE SYSTEM
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21, Escherichia coli
• Mutation(s): No 


• Deposited: 2004-06-29 Released: 2005-04-19 
• Deposition Author(s): Borbulevych, O.Y., Baker, B.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.216 
• R-Value Work: 0.165 
• R-Value Observed: 0.167 

Literature

Increased Immunogenicity of an Anchor-Modified Tumor-Associated Antigen Is Due to the Enhanced Stability of the Peptide/MHC Complex: Implications for Vaccine Design

Borbulevych, O.Y., Baxter, T.K., Yu, Z., Restifo, N.P., Baker, B.M.

(2005) J Immunol 174: 4812-4820

• PubMed: 15814707 
• DOI: 10.4049/jimmunol.174.8.4812
• Primary Citation of Related Structures:  
  1TVH, 1TVB


• PubMed Abstract: 
  

The use of "anchor-fixed" altered peptide ligands is of considerable interest in the development of therapeutic vaccines for cancer and infectious diseases, but the mechanism by which successful altered peptide ligands elicit enhanced immunity is unclear. In this study, we have determined the crystallographic structure of a major tumor rejection Ag, gp100(209-217), in complex with the HLA-A*0201 (HLA-A2) molecule, as well as the structure of a modified version of the peptide which substitutes methionine for threonine at position 2 (T2M; gp100(209-2M)). The T2M-modified peptide, which is more immunogenic in vitro and in vivo, binds HLA-A2 with a approximately 9-fold greater affinity and has a approximately 7-fold slower dissociation rate at physiological temperature. Within the limit of the crystallographic data, the T2M substitution does not alter the structure of the peptide/HLA-A2 complex. Consistent with this finding, in peripheral blood from 95 human subjects, we were unable to identify higher frequencies of T cells specific for either the native or modified peptide. These data strongly support the conclusion that the greater immunogenicity of the gp100(209-2M) peptide is due to the enhanced stability of the peptide/MHC complex, validating the anchor-fixing approach for generating therapeutic vaccine candidates. Thermodynamic data suggest that the enhanced stability of the T2M-modified peptide/HLA-A2 complex is attributable to the increased hydrophobicity of the modified peptide, but the gain due to hydrophobicity is offset considerably by the loss of a hydrogen bond made by the native peptide to the HLA-A2 molecule. Our findings have broad implications for the optimization of current vaccine-design strategies.

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Organizational Affiliation: 

Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
HLA class I histocompatibility antigen, A-2 alpha chain	A, D	275	Homo sapiens	Mutation(s): 0  Gene Names: HLA-A, HLAA
Find proteins for P04439 (Homo sapiens) Explore P04439  Go to UniProtKB:  P04439
NIH Common Fund Data Resources
PHAROS:  P04439 GTEx:  ENSG00000206503

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Beta-2-microglobulin	B, E	100	Homo sapiens	Mutation(s): 0  Gene Names: B2M, CDABP0092, HDCMA22P
Find proteins for P61769 (Homo sapiens) Explore P61769  Go to UniProtKB:  P61769
NIH Common Fund Data Resources
PHAROS:  P61769 GTEx:  ENSG00000166710

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
epitope of Melanocyte protein Pmel 17	C, F	9	N/A	Mutation(s): 0
Find proteins for P40967 (Homo sapiens) Explore P40967  Go to UniProtKB:  P40967
NIH Common Fund Data Resources
PHAROS:  P40967 GTEx:  ENSG00000185664

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GOL	A, B, D, E	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.216 
• R-Value Work: 0.165 
• R-Value Observed: 0.167 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 58.388	α = 90
b = 84.452	β = 90.01
c = 84.016	γ = 90

Software Package:

Software Name	Purpose
HKL-2000	data collection
SCALEPACK	data scaling
MOLREP	phasing
REFMAC	refinement
HKL-2000	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-06-29 
• Released Date: 2005-04-19 
Deposition Author(s): Borbulevych, O.Y., Baker, B.M.

Revision History 

• Version 1.0: 2005-04-19
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Advisory, Version format compliance