异酸脱酶的分布和功能分析在Kinetoplastids之间
Ľubomíra Chmelová1, Kristína Záhonová1,2,3,4, Amanda T S Albanaz1
1Life Science Research Centre, Faculty of Science, University of Ostrava, Ostrava, Czechia.
Genome biology and evolution
|March 6, 2024
概括
基内托塑体进化揭示了复杂的异酸脱酶 (IDH) 历史. 依赖NADP+的IDH2是双局部的,支持非正规的TCA循环和跨物种的多种代谢策略.
科学领域:
- 生物化学 生物化学
- 进化生物学 进化生物学
- 寄生虫学的寄生虫学
背景情况:
- 异酸脱酶 (IDH) 对于三碳酸 (TCA) 循环至关重要,它将异酸转化为α-甲酸盐.
- 类真核生物拥有三种已记录的IDH类型,具有不同的辅因子依赖性和局部化.
- 动态塑体对IDH酶表现出独特的进化轨迹.
研究的目的:
- 阐明异酸脱酶异型在基因类动物中复杂的进化史和功能作用.
- 为了研究不同类型的IDH在各种试类动物物种中的局部化和活性.
- 提供关于非正规的TCA循环和该组内的代谢适应的见解.
主要方法:
- 跨基因多菌株系的IDH基因家族的比较分析.
- 实验确定IDH异型体的亚细胞局部.
- 酶活性测定用于评估辅因子依赖性和反应方向性.
主要成果:
- 试虫和虫的共同祖先有两个依赖NADP+的IDH异型 (IDH1和IDH2).
- IDH1在很大程度上丢失在衍生型的trypanosomatids中,被一种细菌起源的IDH3.3所取代.
- IDH2在只有这种异型的物种中表现出双重线粒体和细胞质定位,支持非正规的TCA循环和双向的IDH3活动.
结论:
- 基因质物IDH进化是由基因丢失,获取和亚功能化所标志.
- IDH2的双重定位和IDH3的活性挑战了这些生物体中规范的TCA循环模型.
- 在IDH活动的变化反映了不同的代谢策略和辅助因子要求,以应对环境的利基.
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