Mycobacterium tuberculosis lipoprotein LprG (Rv1411c) binds triacylated glycolipid agonists of Toll-like receptor 2.

Mycobacterium tuberculosis lipoprotein LprG (Rv1411c) binds triacylated glycolipid agonists of Toll-like receptor 2.
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DOI:
10.1038/nsmb.1869
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发表时间:
2010-09
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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敲除lprG导致小鼠中结核分枝杆菌(Mtb)的毒力降低。Mtb脂蛋白LprG具有TLR 2激动剂活性,被认为依赖于其N-末端三酰化。令人惊讶的是,我们发现非酰化的LprG保留了TLR 2活性。此外,我们显示LprG与三酰化糖脂TLR 2激动剂脂阿拉伯甘露聚糖,脂甘露聚糖和磷脂酰肌醇甘露糖苷(共享核心结构)的关联。三酰化物质的结合是特异性的LprG(而不是LprA),并增加LprG TLR 2激动剂活性;相反,糖脂与LprG的结合增强了它们对TLR 2的识别。与磷脂酰肌醇甘露糖苷复合的LprG的晶体结构揭示了容纳配体的三个烷基链的疏水口袋。总之,我们证明了LprG的糖脂结合功能,增强了TLR 2对三酰化Mtb糖脂的识别,并可能影响糖脂组装或转运细菌细胞壁生物合成。
Knockout of lprG results in decreased virulence of Mycobacterium tuberculosis (Mtb) in mice. Mtb lipoprotein LprG has TLR2 agonist activity, thought to be dependent on its N-terminal triacylation. Surprisingly, here we find that non-acylated LprG retains TLR2 activity. Moreover, we show LprG association with triacylated glycolipid TLR2 agonists lipoarabinomannan, lipomannan and phosphatidylinositol mannosides (which share core structures). Binding of triacylated species was specific to LprG (not LprA) and increased LprG TLR2 agonist activity; conversely, association of glycolipids with LprG enhanced their recognition by TLR2. The crystal structure of LprG in complex with phosphatidylinositol mannoside revealed a hydrophobic pocket that accommodates the three alkyl chains of the ligand. In conclusion, we demonstrate a glycolipid binding function of LprG that enhances recognition of triacylated Mtb glycolipids by TLR2 and may affect glycolipid assembly or transport for bacterial cell wall biogenesis.
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