沙门氏菌 Typhimurium 效应物 SseI 调节宿主多氧体动力学以获得溶酶体胆固醇
Desh Raj1,2, Abhilash Vijay Nair3, Anmol Singh3
1Pharmacology Division, CSIR-Central Drug Research Institute, Lucknow, India.
EMBO reports
|December 18, 2024
概括
沙门氏菌 Typhimurium 劫持过氧体,将宿主胆固醇转移到含沙门氏菌的真空体 (SCV). 这种通过过氧体介导的胆固醇运输对于细菌生长和沙门氏菌诱导的线索形成至关重要.
科学领域:
- 细胞生物学 细胞生物学
- 微生物学 微生物学
- 分子生物学分子生物学
背景情况:
- 沙门氏菌Typhimurium侵入宿主细胞,居住在含沙门氏菌的真空中 (SCV).
- SCV的成熟和细菌增殖取决于胆固醇,但其运输到SCV并未完全理解.
- 低密度脂蛋白 (LDL) 是宿主胆固醇的主要来源.
研究的目的:
- 研究胆固醇运输到含沙门氏菌的真空体的机制.
- 为了阐明过氧体在沙门氏菌Typhimurium细胞内生存中的作用.
主要方法:
- 在沙门氏菌感染期间研究过氧体和SCVs之间的相互作用.
- 分析了沙门氏菌效应蛋白SseI在过氧体征集和宿主因子激活中的功能.
- 利用过氧体枯竭细胞来评估对SCV胆固醇含量和细菌生长的影响.
主要成果:
- 过氧体被招募到SCV中,并充当细菌繁殖的重要器官.
- 沙门氏菌效应因子SseI通过激活宿主ADP-ribosylation factor-1 (ARF-1) 来调解过氧体和SCV之间的相互作用.
- 过氧体促进了 lysosomal胆固醇转移到SCVs,增强了沙门氏菌诱导的丝 (SIF) 形成和细菌生长.
结论:
- 过氧体被Salmonella Typhimurium效应体劫持,作为宿主胆固醇的运输系统.
- 这种过氧体介导的胆固醇输送对于SCV稳定性,SIF完整性和细胞内细菌增殖至关重要.
- 过氧体构成了沙门氏菌分泌作用因子的新目标,以促进病原体的生存.
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