Dynamic regulation of CD28 conformation and signaling by charged lipids and ions

Dynamic regulation of CD28 conformation and signaling by charged lipids and ions
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带电脂质和离子对 CD28 构象和信号传导的动态调节

DOI:
10.1038/nsmb.3489
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发表时间:
2017-10
影响因子:
16.8
通讯作者:
Xu C
Xu C
中科院分区:
生物学1区
文献类型:
--
作者:
Yang W;Pan W;Chen S;Trendel N;Jiang S;Xiao F;Xue M;Wu W;Peng Z;Li X;Ji H;Liu X;Jiang H;Wang H;Shen H;Dushek O;Li H;Xu C

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CD28 provides an essential costimulatory signal for T cell activation, and its function is critical in antitumor immunity. However, the molecular mechanism of CD28 transmembrane signaling remains elusive. Here we show that the conformation and signaling of CD28 are regulated by two counteractive charged factors, acidic phospholipids and Ca2+ions. NMR spectroscopy analyses showed that acidic phospholipids can sequester CD28 signaling motifs within the membrane, thereby limiting CD28 basal signaling. T cell receptor (TCR) activation induced an increase in the local Ca2+concentration around CD28, and Ca2+directly disrupted CD28-lipid interaction, leading to opening and signaling of CD28. We observed that the TCR, Ca2+, and CD28 together form a dual-positive-feedback circuit that substantially amplifies T cell signaling and thus increases antigen sensitivity. This work unravels a new regulatory mechanism for CD28 signaling and thus contributes to the understanding of the dependence of costimulation signaling on TCR signaling and the high sensitivity of T cells.
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