Molecular recognition of antigen involves lattice formation between CD4, MHC class II and TCR molecules.
Molecular recognition of antigen involves lattice formation between CD4, MHC class II and TCR molecules.
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抗原的分子识别涉及 CD4、MHC II 类和 TCR 分子之间的晶格形成。
DOI:
10.1016/0167-5699(95)80081-6
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发表时间:
1995
期刊:
影响因子:
--
通讯作者:
Reinherz,EL
中科院分区:
文献类型:
--
作者:
Sakihama,T;Smolyar,A;Reinherz,EL
Recent evidence indicates that CD4 stably binds to major histocompatibility complex (MHC) class H only after assuming an oligomeric state: the membrane-distal CD4 D1-D2 module interacts directly with MHC class II, whereas the membrane-proximal CD4 D3-D4 module mediates oligomerization. This results in the formation of aggregates critical for T-cell activation. The T-cell receptor (TCR) regulates specific crosslinking and is itself dependent on lattice formation to trigger physiological T-cell responses. Here, Toshiko Sakihama, Alex Smolyar and Ellis Reinherz discuss the molecular nature of CD4-MHC class H clustering and how, despite each of the component interactions being of low affinity, the molecular matrix renders T-cell recognition extremely specific and sensitive.CD4 was originally identified as a 60kDa transmembrane glycoprotein on the 60-70% of human peripheral blood T cells endowed with helper function for both cytolytic T-cell generation and B-cell differentiation 1, 2. These CD4+ T cells were selectively restricted by major histocompatibility complex (MHC) class II molecules 3. Moreover, because anti-CD4 monoclonal antibodies (mAbs) blocked all cellular activation and effector functions, an important role for the molecule in the immune response was evident. However, given that the CD4 protein was nonpolymorphic 4, it could not be responsible for MHC restriction, the process whereby an individual T cell recognizes antigen in the context of one specific polymorphic MHC allele. Molecular cloning of CD4 as a single-copy gene confirmed this lack of polymorphism and predicted an immunoglobulin (Ig)-like structure comprising four tandem extracellular domains s. Subsequent transfection studies defined a direct interaction between CD4 and multiple distinct MHC class II molecules in cell-adhesion assays, showing that the CD4-MHC class II interaction must occur via binding to a nonpolymorphic site on the latter 6, 7.
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影响因子:
5.4
作者:
P. Sayre;E. Reinherz
通讯作者:
E. Reinherz
影响因子:
5.4
作者:
K. Eichmann;J. Jönsson;I. Falk;F. Emmrich
通讯作者:
F. Emmrich
影响因子:
56.9
作者:
R. L. Brady;Eleanor J. Dodson;Guy Dodson;G. Lange;S. Davis;Alan F. Williams;A. Barclay
通讯作者:
A. Barclay
影响因子:
2.9
作者:
DESSEN, A;GUPTA, D;SACCHETTINI, JC
通讯作者:
SACCHETTINI, JC
影响因子:
64.5
作者:
LEAHY, DJ;AXEL, R;HENDRICKSON, WA
通讯作者:
HENDRICKSON, WA