1ktk
From Proteopedia
(New page: 200px<br /> <applet load="1ktk" size="450" color="white" frame="true" align="right" spinBox="true" caption="1ktk, resolution 3.00Å" /> '''Complex of Streptoc...) |
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| - | [[Image:1ktk.gif|left|200px]]<br /> | + | [[Image:1ktk.gif|left|200px]]<br /><applet load="1ktk" size="350" color="white" frame="true" align="right" spinBox="true" |
| - | <applet load="1ktk" size=" | + | |
caption="1ktk, resolution 3.00Å" /> | caption="1ktk, resolution 3.00Å" /> | ||
'''Complex of Streptococcal pyrogenic enterotoxin C (SpeC) with a human T cell receptor beta chain (Vbeta2.1)'''<br /> | '''Complex of Streptococcal pyrogenic enterotoxin C (SpeC) with a human T cell receptor beta chain (Vbeta2.1)'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Superantigens (SAGs) crosslink MHC class II and TCR molecules, resulting | + | Superantigens (SAGs) crosslink MHC class II and TCR molecules, resulting in an overstimulation of T cells associated with human disease. SAGs interact with several different surfaces on MHC molecules, necessitating the formation of multiple distinct MHC-SAG-TCR ternary signaling complexes. Variability in SAG-TCR binding modes could also contribute to the structural heterogeneity of SAG-dependent signaling complexes. We report crystal structures of the streptococcal SAGs SpeA and SpeC in complex with their corresponding TCR beta chain ligands that reveal distinct TCR binding modes. The SpeC-TCR beta chain complex structure, coupled with the recently determined SpeC-HLA-DR2a complex structure, provides a model for a novel T cell signaling complex that precludes direct TCR-MHC interactions. Thus, highly efficient T cell activation may be achieved through structurally diverse strategies of TCR ligation. |
==About this Structure== | ==About this Structure== | ||
| - | 1KTK is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [http://en.wikipedia.org/wiki/Streptococcus_pyogenes Streptococcus pyogenes]. Full crystallographic information is available from [http:// | + | 1KTK is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [http://en.wikipedia.org/wiki/Streptococcus_pyogenes Streptococcus pyogenes]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1KTK OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Karjalainen, K.]] | [[Category: Karjalainen, K.]] | ||
[[Category: Li, H.]] | [[Category: Li, H.]] | ||
| - | [[Category: Llera, A | + | [[Category: Llera, A S.]] |
| - | [[Category: Mariuzza, R | + | [[Category: Mariuzza, R A.]] |
| - | [[Category: McCormick, J | + | [[Category: McCormick, J K.]] |
| - | [[Category: Schlievert, P | + | [[Category: Schlievert, P M.]] |
| - | [[Category: Sundberg, E | + | [[Category: Sundberg, E J.]] |
[[Category: Tormo, J.]] | [[Category: Tormo, J.]] | ||
[[Category: immunity]] | [[Category: immunity]] | ||
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[[Category: t cell receptor beta]] | [[Category: t cell receptor beta]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:37:50 2008'' |
Revision as of 11:37, 21 February 2008
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Complex of Streptococcal pyrogenic enterotoxin C (SpeC) with a human T cell receptor beta chain (Vbeta2.1)
Overview
Superantigens (SAGs) crosslink MHC class II and TCR molecules, resulting in an overstimulation of T cells associated with human disease. SAGs interact with several different surfaces on MHC molecules, necessitating the formation of multiple distinct MHC-SAG-TCR ternary signaling complexes. Variability in SAG-TCR binding modes could also contribute to the structural heterogeneity of SAG-dependent signaling complexes. We report crystal structures of the streptococcal SAGs SpeA and SpeC in complex with their corresponding TCR beta chain ligands that reveal distinct TCR binding modes. The SpeC-TCR beta chain complex structure, coupled with the recently determined SpeC-HLA-DR2a complex structure, provides a model for a novel T cell signaling complex that precludes direct TCR-MHC interactions. Thus, highly efficient T cell activation may be achieved through structurally diverse strategies of TCR ligation.
About this Structure
1KTK is a Protein complex structure of sequences from Homo sapiens and Streptococcus pyogenes. Full crystallographic information is available from OCA.
Reference
Structures of two streptococcal superantigens bound to TCR beta chains reveal diversity in the architecture of T cell signaling complexes., Sundberg EJ, Li H, Llera AS, McCormick JK, Tormo J, Schlievert PM, Karjalainen K, Mariuzza RA, Structure. 2002 May;10(5):687-99. PMID:12015151
Page seeded by OCA on Thu Feb 21 13:37:50 2008
