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在Cryptosporidium parvum线粒体中的替代电子传输链的功能

Silu Deng¹, L David Sibley¹

¹Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri, USA.

bioRxiv : the preprint server for biology

|November 28, 2024

概括

替代氧化酶 (AOX) 和II型NADH脱酶 (NDH2) 不对Cryptosporidium parvum生长至关重要,并且不会产生线粒体膜潜力. 这些发现挑战了以前的模型和药物开发策略.

科学领域:

寄生虫学的寄生虫学
分子生物学分子生物学
生物化学生物化学

背景情况:

寄生虫Cryptosporidium parvum和C. hominis有一个线粒体,一个残留的线粒体对寄生虫的生存至关重要.
线粒体功能依赖于膜潜力,可能由涉及AOX和NDH2的替代呼吸道产生.
建议AOX和NDH2作为药物点,因为它们在哺乳动物中不存在,对抑制剂敏感.

研究的目的:

研究C. parvum.中的AOX和NDH2的局部化和功能.
确定AOX和NDH2是否对寄生虫生长和线粒体功能至关重要.
重新评估拟议的线粒体膜潜在生成模型.

主要方法:

在C. parvum.中生成NDH2 (Δndh2) 和AOX (Δaox) 的淘汰 (KO) 菌株.
使用显微镜确定蛋白质位置的定位研究.
在野生型和KO菌株中对寄生虫生长和对AOX抑制剂 (SHAM,8-HQ) 敏感性的评估.

主要成果:

NDH2局部存在于寄生虫表面膜,而不是线粒体.
既得 Δndh2 和 Δaox KO 菌株都很容易获得,这表明它们的作用并不重要.
ox KO菌株的生长与野生类型一样被AOX抑制剂抑制,这表明AOX不是目标.
对于C. parvum生长来说,AOX和NDH2是不可或缺的.

结论:

在C. parvum. 中,NDH2和AOX是非必要的基因.
提出的AOX和NDH2产生线粒体膜潜力的模型是不正确的.
必须存在一种维持线粒体膜潜力的替代机制.
AOX和NDH2不是适合用于密码化症治疗的药物标.

关键词:

这种病叫做cryptosporidiosis.替代性氧化酶是一种替代性氧化酶.线粒体中的线粒体.寄生虫的生长生长寄生虫的生长第二种类型的NADH脱酶.

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