A motif in the V3 domain of the kinase PKC-θ determines its localization in the immunological synapse and functions in T cells via association with CD28.

A motif in the V3 domain of the kinase PKC-θ determines its localization in the immunological synapse and functions in T cells via association with CD28.
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DOI:
10.1038/ni.2120
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发表时间:
2011-10-02
期刊:
影响因子:
30.5
通讯作者:
Altman, Amnon
Altman, Amnon
中科院分区:
医学1区
文献类型:
--
作者:
Kong, Kok-Fai;Yokosuka, Tadashi;Canonigo-Balancio, Ann J.;Isakov, Noah;Saito, Takashi;Altman, Amnon

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蛋白激酶C-θ(Protein Kinase C-θ,PKC-PKC)位于免疫突触的中心,但其在T细胞活化中的作用及其机制尚不清楚。我们发现,PKC-CD28V3结构域是由θ依赖的LCK结合介导的IS定位的必要条件和充分条件。我们在V3中发现了CD28结合所需的一个保守的富含脯氨酸的基序,并进行了定位。CD28的结合对于PKC-θ介导的下游信号和Th2和Th17的分化是必不可少的,但对Th1的分化不是必需的。异位表达V3使PKC-θ与IS隔离并干扰其功能。这些结果确定了CD28信号的独特模式,为PKC-θ的IS定位奠定了分子基础,并暗示基于V3的“诱骗”可作为T细胞介导性炎症性疾病的治疗手段。
Protein kinase C-θ (PKC-θ) translocates to the center of the immunological synapse, but the underlying mechanism and its importance in T cell activation are unknown. We found that the PKC-θ V3 domain is necessary and sufficient for IS localization mediated by Lck-dependent association with CD28. We identified a conserved proline-rich motif in V3 required for CD28 association and IS localization. CD28 association was essential for PKC-θ-mediated downstream signaling and TH2 and TH17, but not TH1, differentiation. Ectopic V3 expression sequestered PKC-θ from the IS and interfered with its functions. These results identify a unique mode of CD28 signaling, establish a molecular basis for the IS localization of PKC-θ, and implicate V3-based “decoys” as therapeutic modalities for T cell-mediated inflammatory diseases.
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