Molecular basis for specific recognition of bacterial ligands by NAIP/NLRC4 inflammasomes.

Molecular basis for specific recognition of bacterial ligands by NAIP/NLRC4 inflammasomes.
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DOI:
10.1016/j.molcel.2014.02.018
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发表时间:
2014-04-10
期刊:
影响因子:
16
通讯作者:
Vance, Russell E.
Vance, Russell E.
中科院分区:
生物学1区
文献类型:
--
作者:
Tenthorey, Jeannette L.;Kofoed, Eric M.;Daugherty, Matthew D.;Malik, Harmit S.;Vance, Russell E.

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NLR(核苷酸结合域[NBD]和富含亮氨酸重复序列[LRR])蛋白介导哺乳动物和植物对病原体的天然免疫感知。NLRs如何检测它们的同源刺激仍然知之甚少。在这里,我们分析了NAIP(NLR凋亡抑制蛋白)炎性小体对配体的识别。小鼠表达多个高度相关的NAIP同源基因,这些基因识别不同的细菌蛋白。我们分析了一个由43个嵌合NAIPS组成的小组,使我们能够映射负责特定配体检测的NAP结构域。令人惊讶的是,配体特异性不是由LRR域介导的,而是由包含几个与NbD相关的α螺旋结构域的内部区域介导的。有趣的是,我们发现,在啮齿动物和灵长类动物中,配基专一性结构域都是在正向选择下进化的。我们进一步证明了NAIPS与下游信号转接子NLRC4(NLR家族,含卡片4)随后的共齐聚需要配体结合。这些数据为NLRs如何检测配体并组装成炎性小体提供了分子基础。
NLR (nucleotide-binding domain [NBD]- and leucine-rich repeat [LRR]-containing) proteins mediate innate immune sensing of pathogens in mammals and plants. How NLRs detect their cognate stimuli remains poorly understood. Here, we analyzed ligand recognition by NAIP (NLR Apoptosis Inhibitory Protein) inflammasomes. Mice express multiple highly related NAIP paralogs that recognize distinct bacterial proteins. We analyzed a panel of 43 chimeric NAIPs, allowing us to map the NAIP domain responsible for specific ligand detection. Surprisingly, ligand specificity was mediated not by the LRR domain, but by an internal region encompassing several NBD-associated α-helical domains. Interestingly, we find that the ligand specificity domain has evolved under positive selection in both rodents and primates. We further show that ligand binding is required for the subsequent co-oligomerization of NAIPs with the downstream signaling adaptor NLRC4 (NLR family, CARD-containing 4). These data provide a molecular basis for how NLRs detect ligands and assemble into inflammasomes.
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