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    Functional Analysis of Interactions within the TCR-CD3-pMHC-CD4 Macro-complex

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    Author
    Bronnimann, Heather
    Issue Date
    2016
    Keywords
    pMHC
    restriction
    T cell
    TCR
    Immunobiology
    CD4
    Advisor
    Kuhns, Michael
    
    Metadata
    Show full item record
    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Embargo
    Release after 01-Jun-2017
    Abstract
    CD4⁺ T cells are a critical component of the adaptive immune compartment. Each T cell expresses a clonotypic T cell receptor (TCR) that must discriminate between self and foreign peptides presented in major histocompatibility molecules (pMHC) on the surface of antigen presenting cells to direct T cell fate decisions. Information regarding TCR-pMHC interactions must then be transmitted to the TCR-associated CD3 signaling modules, which contain ITAMs that serve as signaling substrates for Src kinases. The Src kinase, Lck, is recruited to the pMHC-bound TCR-CD3 complex via association with the CD4 coreceptor that binds MHCII. It is therefore through the coordinated interactions within the TCR-CD3-pMHC-CD4 macro-complex that productive TCR signaling can occur to inform T cell activation and fate decisions. While much is known regarding the structure of the individual subunits that make up the TCR-CD3-pMHC-CD4 macro-complex, there is little information regarding how these components come together to initiate TCR signaling and determine functional outcomes. Here, we have interrogated how interaction of these individual components leads to productive T cell activation. Specifically, we interrogated the nature of TCR-MHC interactions and provide evidence that there is intrinsic specificity of the TCR for MHCII. We have also built mouse models to determine the role of TCR-CD3 interactions and TCR dimerization in the transmission of information from the TCR to the CD3 subunits following TCR-pMHC engagement. Finally, we show that both the CD4 transmembrane and extracellular domains contribute to T cell activation in vitro. Overall, this work provides insight into how the constituents of the TCR-CD3-pMHC-CD4 macro-complex interact to initiate T cell fate and function.
    Type
    text
    Electronic Dissertation
    Degree Name
    Ph.D.
    Degree Level
    doctoral
    Degree Program
    Graduate College
    Immunobiology
    Degree Grantor
    University of Arizona
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