被Toxoplasma gondii诱导的入侵孔
Yuto Kegawa1, Frances Male2, Irene Jiménez-Munguía1
1Section on Integrative Biophysics; Division of Basic and Translational Biophysics, Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), National Institutes of Health (NIH), Bethesda, MD, USA.
EMBO reports
|September 19, 2025
概括
寄生虫Toxoplasma gondii在入侵期间在宿主细胞中形成一个短暂的孔隙,涉及RON2.2等蛋白质. 这个孔隙被称为"入侵孔隙",对于宿主细胞进入至关重要.
科学领域:
- 细胞生物学 细胞生物学
- 寄生虫学的寄生虫学
- 生物物理学的生物物理.
背景情况:
- 毒素菌的入侵需要分泌的蛋白质,如RON2形成一个移动的连接点.
- 侵袭期间宿主细胞膜的变化尚未完全理解.
研究的目的:
- 在T. gondii入侵期间研究宿主细胞膜透的生物物理机制.
- 确定RON2在膜导电性变化和侵入中的作用.
主要方法:
- 宿主细胞膜导电性的高分辨率电生理学记录 (小于200μs).
- 对寄生虫诱导过渡的大量数据集 (910000个数据点) 的时间序列分析.
- 野生型RH菌株寄生虫与RON2贫乏寄生虫的比较.
主要成果:
- 寄生虫暴露导致宿主细胞膜导电率在入侵之前的短暂增加.
- RON2对于产生这些瞬态物质并不必不可少,但它缺少会改变它们的特性.
- 多个量子导电性变化表明孔隙组件动态 (插入,移除,阻塞).
- 野生类型寄生虫的量子步尺大小 (平均0.26nS) 类似于形成毛孔的蛋白质EXP2.
- 缺少RON2的寄生虫显示出明显不同的量子平均值 (0.19nS).
- 在前进入侵之前,一直观察到分量.
结论:
- 在T. gondii的入侵过程中,宿主细胞膜中形成了一个短暂的孔隙,称为"入侵孔隙".
- 这种孔隙形成是一个关键的步骤,对于寄生虫进入至关重要.
- RON2 影响入侵孔的特性,但对其初始形成不需要.
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