对NLRC4的酸化对炎症酶激活至关重要
Yan Qu1, Shahram Misaghi, Anita Izrael-Tomasevic
1Department of Physiological Chemistry, Genentech Inc., 1 DNA Way, South San Francisco, California 94080, USA.
Nature
|August 14, 2012
概括
NLRC4炎症酶激活需要PKCδ对Serine 533的酸化,这是细菌感染期间caspase-1激活和热的关键步骤.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
背景情况:
- NLRC4是先天免疫的一个关键传感器,检测细菌成分,如鞭毛蛋白.
- NLRC4的激活会导致炎症酶组合,卡斯帕酶-1的激活,以及烧灭.
- 了解NLRC4调节对于控制炎症反应至关重要.
研究的目的:
- 为了确定调节NLRC4炎症体功能的翻译后修改.
- 阐明NLRC4酸化在对细菌病原体的反应中的特定作用.
- 为了确定负责NLRC4酸化的激酶.
主要方法:
- 使用了表达标记NLRC4.4的模拟老鼠.
- 采用西式涂抹与固特异性抗体.
- 使用NLRC4突变 (S533A,S533D) 和激酶抑制剂进行了功能测试.
- 研究了PRKCD (PKCδ) 在NLRC4酸化和炎症酶激活中的作用.
主要成果:
- 在Salmonella typhimurium感染时,在Serine 533 (S533) 中识别了NLRC4的酸化.
- 证明S533酸化对于卡斯巴酶-1激活和热症至关重要.
- 表明PRKCD (PKCδ) 是负责在S533.3.处化NLRC4的激酶.
- 发现S533A NLRC4突变体未能招募procaspase-1并组装炎症体.
结论:
- 通过PKCδ在S533的NLRC4的酸化是炎症酶激活的关键调节步骤.
- 这种酸化事件是必要的,以启动热和IL-1β分泌作为对细菌感染的反应.
- NLRC4 S533酸化可能会诱导炎症酶组合和功能所需的结构变化,影响宿主防御.
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