| Measurement of ATP Hydrolytic Activity of Plasma Membrane H+-ATPase from Arabidopsis thaliana Leaves
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Author:
Date:
2016-12-05
[Abstract] Plant plasma membrane H+-ATPase, which is a P-type ATPase, couples ATP hydrolysis to H+ extrusion and thereby generates an electrochemical gradient across the plasma membrane. The proton gradient is necessary for secondary transport, cell elongation, and membrane potential maintenance. Here we describe a protocol for measurement of the ATP hydrolytic activity of the plasma membrane H+-ATPase from Arabidopsis thaliana leaves.
[摘要] 作为P型ATP酶的植物质膜H sup + -ATPase将ATP水解耦合到H + +/- 挤出，从而在质膜上产生电化学梯度。质子梯度对于二次转运，细胞伸长和膜电位维持是必需的。这里我们描述用于测量来自拟南芥叶片的质膜H + -ATPase的ATP水解活性的方案。
关键词： strong> 拟南芥，ATP水解活性，原钒酸盐，P-型ATP酶，血浆膜H + -ATPase
质膜H + -ATPase活性的测定对于阐明其功能和调节机制是重要的。然而，有时难以确定质膜H sup + -ATP酶的ATP水解活性，因为植物细胞含有许多ATP水解酶。该协议是基于Uemura和Yoshida（1986）和Kinoshita等人的出版物开发的。 （1995）。我们使用KNO 3作为V型ATP酶的抑制剂，钼酸铵作为酸性磷酸酶的抑制剂，寡霉素作为F型ATP酶的抑制剂，NaF作为磷酸酶的抑制剂（Shimazaki和Kondo ，1987; Kinoshita等人，1995）。原钒酸盐抑制P型ATP酶，并且因此可以通过评估来自ATP水解的钒酸盐敏感性P 1释放来用于测量质膜H sup + -ATP酶的活性。释放的P 1与钼酸盐反应形成蓝色络合物，然后可以通过测量在750nm的吸收来量化。
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| Assessment of Brown Adipocyte Thermogenic Function by High-throughput Respirometry
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Author:
Date:
2015-11-05
[Abstract] Brown adipose tissue (BAT) has the unique ability to dramatically increase mitochondrial uncoupled fuel oxidation for thermogenesis in response to adrenergic stimulation. A key parameter in assessing brown adipocyte thermogenic capacity is mitochondrial uncoupling as determined by respiration. Measuring mitochondrial oxygen consumption rate (OCR) therefore provides valuable information to study the regulation and dysregulation of fuel metabolism and energy expenditure. Adding measurements of mitochondrial membrane potential allows for more in-depth interpretation of the respirometry data. Here we provide protocols for measuring respiration in adherent intact and plasma membrane permeabilized brown adipocytes using the Seahorse XF Analyzer. In the protocol Part I, a combination of ...
[摘要] 棕色脂肪组织（BAT）具有显着增加线粒体解偶联燃料氧化以响应肾上腺素刺激的热生成的独特能力。评估棕色脂肪细胞产热能力的关键参数是通过呼吸确定的线粒体解偶联。因此，测量线粒体氧消耗率（OCR）为研究燃料代谢和能量消耗的调节和失调提供了有价值的信息。添加线粒体膜电位的测量允许更加深入地解释呼吸数据。在这里我们提供使用Seahorse XF分析仪测量贴壁完整和质膜透性棕色脂肪细胞呼吸的协议。在方案部分I中，去甲肾上腺素和游离脂肪酸的组合用于诱导解偶联呼吸。然后使用ATP合酶抑制剂寡霉素，化学去偶联剂FCCP和复合物III抑制剂抗霉素A分别测量偶联的，最大的和非线粒体的氧消耗。在方案第II部分中，质膜用重组perfringolysin O透化，胆固醇依赖性细胞溶解素寡聚化成在质膜中专门的孔。这允许代谢物可用性的实验性控制，而不从天然细胞环境中分离线粒体。
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