一种Trichomonas vaginalis C2-XYPPX重复蛋白质,具有结构化的C2域,在结合时表现出抑制的灵活性
Garry W Buchko1, Lijun Liu2, Kevin P Battaile3
1Seattle Structural Genomics Center for Infectious Disease, Seattle, WA, USA; Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA; School of Molecular Biosciences, Washington State University, Pullman, WA, 99164, USA.
Biochimie
|November 24, 2025
概括
来自Trichomonas vaginalis (Tv-C2-1) 的C2域在结构上具有特征,揭示了希腊键图案. 这个域结合离子,表明在膜贩运和脂质修饰途径中保留了功能.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 寄生虫学的寄生虫学
背景情况:
- C2域是保存的真核细胞模块,参与了膜贩运和脂质修饰.
- 阴道三虫编码了八种C2-XYPPX蛋白质,这表明这些域具有重要作用.
- 在T. vaginalis中,相关的XYPPX重复域的功能仍然未被描述.
研究的目的:
- 从结构和物理上描述Trichomonas vaginalis. 的C2域 (Tv-C2-1).
- 为了研究Tv-C2-1.1.2的结合特性.
- 为了解T. vaginalis.中的C2-XYPPX蛋白的功能提供洞察力.
主要方法:
- 使用X射线结晶学来确定Tv-C2-1.0的晶体结构.
- 使用NMR光谱,包括化学转移扰动研究,来评估结合.
- 用胺15N异核稳定状态{1H}-15NNOE和旋转相关时间测量来评估蛋白质动力学.
主要成果:
- Tv-C2-1采用了正规的C2域折叠,一个紧的希腊键图案,有八个反平行β链.
- Tv-C2-1 结合了两个离子,其解离常数 (Kd) 为 58.0 ± 0.1 μM 和 232 ± 6 μM.
- 结合会诱导更紧的结构,并减少特定循环中的动态,与C2域函数一致.
结论:
- Tv-C2-1表现出C2域特征的结构和结合特征得到保留.
- 这些发现支持C2域在T. vaginalis.内膜相关过程中的保留作用.
- 对相关的XYPPX重复域的功能进行进一步的研究是有必要的.
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