一种Trypanosoma cruzi含有Per-Arnt-Sim域的糖酸酶异型,作为细胞内条件的可能传感器
Maura Rojas-Pirela1, Andrea Delgado1, Yossmayer D C Rondón-Guerrero1
1Laboratorio de Enzimología de Parásitos, Departamento de Biología, Facultad de Ciencias, Universidad de Los Andes, Mérida, 5101, Venezuela.
这项研究描述了Trypanosoma cruzi中独特的糖酸激酶 (PGK),其中包含一个Per-ARNT-Sim (PAS) 域. 该PAS域调节了酶的活性,这表明它在感知细胞内条件和调节寄生虫代谢方面发挥了作用.
科学领域:
- 生物化学 生物化学
- 寄生虫学的寄生虫学
- 分子生物学分子生物学
背景情况:
- 每个ARNT-Sim (PAS) 域是各种生物体中发现的调节域.
- 含有PAS域的蛋白质参与感知小联结体和调节细胞过程.
- 包括Trypanosoma cruzi在内的kinetoplastids具有未表征的PAS域蛋白.
研究的目的:
- 描述一种具有来自Trypanosoma cruzi (TcPAS-PGK) 的PAS域的新型糖酸激酶 (PGK).
- 研究TCPAS-PGK的酶性质和基质动力学.
- 阐明PAS域在TCPAS-PGK活动和调节中的功能作用.
主要方法:
- 分离离心和选择性透以确定蛋白质局部化.
- 具有 (PAS-PGKc) 和没有 (PAS-PGKt) PAS域的TcPAS-PGK的异质表达.
- 酶分析测试以确定基质亲和力,动力学和辅助因子的作用.
主要成果:
- TcPAS-PGK是一种活跃的58kDa酶,局部存在于糖体和线粒体中.
- 该酶表现出非迈凯利斯-门动力学,其中两个活动峰值为PAS-PGKc,一个为PAS-PGKt.
- 该PAS域对于由血红蛋白和FAD刺激至关重要,其活性增加了高达55%.
结论:
- TcPAS-PGK的PAS域在活体中调节其催化活性方面发挥着至关重要的作用.
- TcPAS-PGK可能充当细胞内传感器,调整寄生虫的中间代谢.
- 这一发现为Trypanosoma cruzi.的代谢调节提供了洞察力.
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