1klu
From Proteopedia
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[[Image:1klu.gif|left|200px]] | [[Image:1klu.gif|left|200px]] | ||
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'''Crystal structure of HLA-DR1/TPI(23-37) complexed with staphylococcal enterotoxin C3 variant 3B2 (SEC3-3B2)''' | '''Crystal structure of HLA-DR1/TPI(23-37) complexed with staphylococcal enterotoxin C3 variant 3B2 (SEC3-3B2)''' | ||
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[[Category: Sidney, J.]] | [[Category: Sidney, J.]] | ||
[[Category: Sundberg, E J.]] | [[Category: Sundberg, E J.]] | ||
| - | [[Category: | + | [[Category: Cd4+ t cell]] |
| - | [[Category: | + | [[Category: Enterotoxin c3]] |
| - | [[Category: | + | [[Category: Hla-dr1/tpi]] |
| - | [[Category: | + | [[Category: Human melanoma antigen]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 22:53:47 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 19:53, 2 May 2008
Crystal structure of HLA-DR1/TPI(23-37) complexed with staphylococcal enterotoxin C3 variant 3B2 (SEC3-3B2)
Overview
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.
About this Structure
1KLU is a Protein complex structure of sequences from Homo sapiens and Staphylococcus aureus. Full crystallographic information is available from OCA.
Reference
Minor structural changes in a mutated human melanoma antigen correspond to dramatically enhanced stimulation of a CD4+ tumor-infiltrating lymphocyte line., Sundberg EJ, Sawicki MW, Southwood S, Andersen PS, Sette A, Mariuzza RA, J Mol Biol. 2002 May 31;319(2):449-61. PMID:12051920 Page seeded by OCA on Fri May 2 22:53:47 2008
