Recognition of lipopolysaccharide pattern by TLR4 complexes.

Recognition of lipopolysaccharide pattern by TLR4 complexes.
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DOI:
10.1038/emm.2013.97
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发表时间:
2013-12-06
影响因子:
12.8
通讯作者:
Lee, Jie-Oh
Lee, Jie-Oh
中科院分区:
医学2区
文献类型:
--
作者:
Park, Beom Seok;Lee, Jie-Oh

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脂多糖(LPS)是革兰氏阴性菌外膜的主要成分。从感染病原体释放的微量LPS可以启动有效的先天免疫反应,使免疫系统对抗进一步感染。然而,当LPS反应没有得到适当控制时,它可能导致致命的败血性休克综合征。LPS在不同细菌物种中的共同结构模式由LPS受体和辅助蛋白、LPS结合蛋白(LBP)、CD 14和Toll样受体4(TLR 4)-MD-2复合物的级联识别。这些蛋白质的结构解释了我们的免疫系统如何将LPS分子与结构相似的宿主分子区分开来。它们还为发现抗败血症药物提供了有用的见解。本文综述了这些结构,并描述了LPS受体和辅助蛋白识别LPS的结构基础。
Lipopolysaccharide (LPS) is a major component of the outer membrane of Gram-negative bacteria. Minute amounts of LPS released from infecting pathogens can initiate potent innate immune responses that prime the immune system against further infection. However, when the LPS response is not properly controlled it can lead to fatal septic shock syndrome. The common structural pattern of LPS in diverse bacterial species is recognized by a cascade of LPS receptors and accessory proteins, LPS binding protein (LBP), CD14 and the Toll-like receptor4 (TLR4)–MD-2 complex. The structures of these proteins account for how our immune system differentiates LPS molecules from structurally similar host molecules. They also provide insights useful for discovery of anti-sepsis drugs. In this review, we summarize these structures and describe the structural basis of LPS recognition by LPS receptors and accessory proteins.
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