Structural basis of the CD8 alpha beta/MHC class I interaction: focused recognition orients CD8 beta to a T cell proximal position.
Structural basis of the CD8 alpha beta/MHC class I interaction: focused recognition orients CD8 beta to a T cell proximal position.
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DOI:
10.4049/jimmunol.0901276
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发表时间:
2009-08-15
期刊:
影响因子:
--
通讯作者:
Margulies DH
中科院分区:
文献类型:
--
作者:
Wang R;Natarajan K;Margulies DH
In the immune system, B cells, dendritic cells, NK cells, and T lymphocytes all respond to signals received via ligand binding to receptors and coreceptors. While the specificity of T cell recognition is determined by interaction of T cell receptors with MHC/peptide complexes, the development of T cells in the thymus and their sensitivity to antigen are also dependent on coreceptor molecules CD8 (for MHCI) and CD4 (for MHCII). The CD8αβ heterodimer is a potent coreceptor for T cell activation, but efforts to understand its function fully have been hampered by ignorance of structural details of its interactions with MHCI. Here we describe the structure of CD8αβ in complex with the murine MHCI molecule H-2Dd at 2.6 Å resolution. The focus of the CD8αβ interaction is the acidic loop (residues 222-228) of the α3 domain of H-2Dd. The β subunit occupies a T cell membrane-proximal position, defining the relative positions of the CD8α and CD8β subunits. Unlike the CD8αα homodimer, CD8αβ does not contact MHCIα2 or β2-microglobulin domains. Movements of the CD8α complementarity determining region-(CDR) 2 and CD8β CDR1 and CDR2 loops as well as flexibility of the H-2Dd CD loop facilitate the monovalent interaction. The structure resolves inconclusive data on the topology of the CD8αβ/MHCI interaction, indicates that CD8β is crucial in orienting the CD8αβ heterodimer, provides a framework for understanding the mechanistic role of CD8αβ in lymphoid cell signaling, and offers a tangible context for design of structurally altered coreceptors for tumor and viral immunotherapy.
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DOI:
10.1084/jem.194.10.1485
发表时间:
2001-11-19
期刊:
The Journal of experimental medicine
影响因子:
--
作者:
Arcaro A;Grégoire C;Bakker TR;Baldi L;Jordan M;Goffin L;Boucheron N;Wurm F;van der Merwe PA;Malissen B;Luescher IF
通讯作者:
Luescher IF
DOI:
10.1107/s0907444904019158
发表时间:
2004-12-01
影响因子:
2.2
作者:
Emsley, P;Cowtan, K
通讯作者:
Cowtan, K
影响因子:
56.9
作者:
CORR, M;SLANETZ, AE;MARGULIES, DH
通讯作者:
MARGULIES, DH
影响因子:
4.4
作者:
Devine, L;Rogozinski, L;Kavathas, PB
通讯作者:
Kavathas, PB
影响因子:
4.4
作者:
Belyakov,Igor M.;Kozlowski,Steven;Berzofsky,Jay A.
通讯作者:
Berzofsky,Jay A.