相关实验视频
Updated: May 21, 2025

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Measuring In Vitro ATPase Activity for Enzymatic Characterization
Published on: August 23, 2016
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由驱动力驱动的Enterococcus hirae V-ATPase的ATP合成由驱动力驱动
Akihiro Otomo1, Lucy Gao Hui Zhu2, Yasuko Okuni3
1Institute for Molecular Sciences, National Institutes of Natural Sciences, Okazaki, Aichi, Japan; Graduate Institute for Advanced Studies, SOKENDAI, Kanazawa, Japan.
The Journal of biological chemistry
|March 21, 2025
概括
这项研究表明,Enterococcus hirae中的V-ATPase可以使用动力合成ATP. 这一发现突显了V-ATPases的功能可逆性及其对ATP生产的潜力.
科学领域:
- 生物化学 生化学
- 分子生物学分子生物学
- 生物能源学 生物能源学
背景情况:
- V-ATPases主要被称为ATP-解离子.
- 它们对ATP合成的能力在很大程度上尚未被探索.
- 了解V-ATPase的功能对于细胞能量代谢至关重要.
研究的目的:
- 为了研究Na+携带的Enterococcus hirae V-ATPase (EhVoV1) 的ATP合成能力.
- 描述由动力 (smf) 驱动的ATP合成的条件和效率.
- 为了探索EhVoV1的功能可逆性.
主要方法:
- 将EhVoV1复合成脂质体.
- 使用基于 luciferin/luciferase 的测定方法对 ATP 合成进行定量分析.
- 测量运动参数 (米歇利斯常数) 和离子合比.
主要成果:
- 在高smf (269.3mV) 下,EhVoV1以4.7秒-1的速度合成了ATP.
- 对ADP和无机酸盐的迈凯利斯常数与ATP合成酶相比较.
- 的度梯度和膜潜力都对ATP合成作出了贡献,前者影响略大.
- EhVoV1证明了在平衡状态下ATP合成和水解之间的可逆反应.
- Na+/ATP比率 (3.2 ± 0.4) 与结构对称比率 (3.3) 密切匹配,表明紧密的合.
结论:
- Enterococcus hirae V-ATPase (EhVoV1) 具有由动力驱动的固有的ATP合成能力.
- 这项研究揭示了V-ATPases的功能可逆性,挑战了它们仅仅作为离子的传统作用.
- 活体生理功能很可能是由smf和ATP合成的吉布斯自由能量之间的平衡以及调节机制决定的.
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