结核菌调节宿主ATP6V1E1的酸化,以促进细胞内生存
Jianxia Chen1, Fen Tang2, Lianhua Qin3
1Clinical and Translational Research Center, Shanghai Key Lab of Tuberculosis, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai, China.
结核菌 (Mycobacterium tuberculosis,Mtb) 使用 Chp2 蛋白质阻断 lysosomal 酸化,从而阻碍宿主防御. 抑制BMX激酶会破坏这一过程,从而提供一种潜在的治疗策略来对抗Mtb感染.
科学领域:
- 微生物学 微生物学
- 细胞生物学 细胞生物学
- 免疫学 免疫学 免疫学
背景情况:
- 像Mycobacterium tuberculosis (Mtb) 这样的细胞内病原体通过防止 lysosomal 酸化来逃避宿主免疫力.
- lysosomal 酸性化对于细胞防御机制对病原体至关重要.
研究的目的:
- 为了阐明Mtb抑制 lysosomal 酸化的机制.
- 为了确定参与Mtb生存战略的宿主目标和途径.
- 探索针对Mtb.的潜在宿主导治疗点.
主要方法:
- 蛋白质分析以确定针对宿主细胞的Mtb分泌因子.
- 生物化学试验研究V-ATPase的功能和调节.
- 酸化部位映射和激酶活性测试.
- 细胞和体内模型来评估Mtb生长和治疗疗效.
主要成果:
- Mtb分泌的乙转移酶Chp2 (Rv1184) 的目标是真空的ATPase (V-ATPase).
- 在Tyr56/57中对V-ATPase E1亚单元 (ATP6V1E1) 的酸化抑制了V-ATPase组合和溶解体酸化.
- 氨酸激酶BMX促进ATP6V1E1酸化,而Chp2增强了这种相互作用.
- 抑制BMX显著损害了巨细胞和体内的Mtb生长.
结论:
- Mtb利用Chp2通过BMX介导ATP6V1E1的酸化来操纵宿主V-ATPase的活性,从而防止溶解体酸化.
- 这种机制突出了新的宿主-病原体相互作用,并揭示了BMX作为一个关键的调节器.
- 调节 lysosomal 酸化是一种有希望的宿主导治疗策略,用于对抗 Mtb 感染.
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