阿尔法激酶1是细菌ADP-肝素的细胞原性免疫受体
Nature
|August 17, 2018
概括
研究人员确定ADP-β-D-曼诺-肝素 (ADP-Hep) 是一种激活NF-κB信号的细菌代谢物. 这一发现揭示了α-酶1 (ALPK1) 作为对宿主防御细菌感染至关重要的模式识别受体.
科学领域:
- 免疫学
- 微生物学
- 分子生物学
背景情况:
- 病原体相关的分子模式 (PAMPs) 通过模式识别受体激活宿主免疫反应,通常导致NF-κB信号传递.
- 细菌代谢物D-甘油β-D-曼诺-酸盐 (HBP) 已被建议激活NF-κB,但其作为PAMP及其受体的作用尚不清楚.
研究的目的:
- 确定负责NF-κB激活的特定细菌代谢物及其相关的模式识别受体.
- 阐明ADP-肝素介导免疫激活的分子机制.
主要方法:
- 在Yersinia伪结核病中进行转子子和CRISPR-Cas9查.
- 生物化学分析,包括配体受体结合测定.
- 确定ALPK1-ADP-Hep复合物的晶体结构.
- 在小鼠体内研究以评估炎症反应.
主要成果:
- 鉴定出ADP-β-D-曼诺-肝素 (ADP-Hep) 是激活NF-κB和细胞因子表达的细菌代谢物.
- 通过α- 激酶1 (ALPK1) - TIFA (TRAF相互作用蛋白与叉关联域) 轴,ADP-Hep进入宿主细胞质,激活NF-κB.
- ADP-Hep直接与ALPK1结合,诱导TIFA的酸化和激活.
- 晶体结构显示了ALPK1-ADP-Hep识别的原子细节.
- 在小鼠感染或服用时,ADP-Hep诱导Alpk1依赖性炎症.
结论:
- ADP-β-D-曼诺-肝素 (ADP-Hep) 被确定为一种新型的PAMP.
- 阿尔法激酶1 (ALPK1) 作为ADP-Hep的模式识别受体.
- ALPK1-TIFA轴对于感知细菌ADP-Hep和启动炎症反应至关重要.
- ADP-Hep是免疫调节的潜在目标.
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