通过直接的结合相互作用,ATP调节电压关闭的质子通道的活动
Akira Kawanabe1, Kohei Takeshita2, Maki Takata1
1Laboratory of Molecular Physiology & Biophysics, Faculty of Medicine, Kagawa University, Miki-cho, Kagawa, Japan.
The Journal of physiology
|August 9, 2023
概括
氨酸三酸盐 (ATP) 对于维持电压关闭的质子通道 (Hv1) 活动至关重要. 细胞内ATP直接与Hv1相互作用,加速激活并增加质子电流,这对生理功能至关重要.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 生理学 生理学 生理学
背景情况:
- 电压关闭的质子通道 (Hv1) 调节由各种分子影响的质子流.
- 腺三酸盐 (ATP) 在HV1活性中的确切作用和机制以前尚不清楚.
- 现有的信念表明ATP对于HV1来说不是必不可少的,尽管有一些调节的迹象.
研究的目的:
- 研究ATP调节Hv1活动的分子机制.
- 为了确定ATP是否需要HV1.1的生理功能.
- 阐明ATP与Hv1.1之间的直接相互作用.
主要方法:
- 电生理学被用来通过小鼠Hv1 (mHv1) 分析质子电流.
- 微尺度热泳 (MST) 用于证明纯化mHv1和ATP之间的直接分子相互作用.
- 实验使用了非水解ATP类似物和内源性质子电流.
主要成果:
- 细胞内ATP加速了mHv1激活动力学,增加了质子电流幅度.
- ATP的作用独立于酶性水解,由非水解类型的类似物证实.
- 通过MST,通过数量证明了纯化mHv1和ATP之间的直接分子相互作用.
- 在乳腺癌细胞系中,ATP增强了内源性Hv1质子电流.
结论:
- 细胞质ATP是维持Hv1活动所必需的.
- ATP与HV1直接相互作用,影响其动力学和质子电流幅度.
- 通过直接的分子相互作用,ATP在HV1的生理功能中起着至关重要的作用.
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