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Carboxyl-Terminal Src Kinase Binds CD28 upon Activation and Mutes Downstream Signaling.

J Immunol. 2019 Aug 15;203(4):1055-1063. Epub 2019 Jul 10
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摘要


Full T cell activation depends on stimulation of the TCR in conjunction with a costimulatory receptor. The involvement of costimulatory molecules is potent, and a mechanistic understanding of how downstream signaling is regulated is required to fully understand T cell responsiveness. In this study, a proteomic approach was taken to identify the interactomes of the coreceptors CD2 and CD28. These coreceptors are both positive regulators of T cell activation, but CD28 less potently induces TCR-proximal signaling. C-terminal Src kinase (CSK), a negative regulator of TCR signaling, was identified as a specific and direct interactor only of activated CD28. CSK is recruited to CD28 upon T cell activation, and the in vitro kinase activity of CSK is enhanced in the presence of phosphorylated CD28. Interruption of the CSK/CD28 interaction prior to TCR/CD28 costimulation induces a signaling response which mimics the more potent CD2-induced TCR-proximal pathway activation. Thus, CD28 functions as a novel adaptor protein for CSK, and CSK regulates signaling downstream of CD28.

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