2'-脱氧-ADPR比ADPR更快地激活人类的TRPM2,从而在生理学Ca2+度下诱导更高的电流
Jelena Pick1, Simon Sander2, Stefanie Etzold1
1The Calcium Signaling Group, Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
由于更快的动力学和更高的敏感性,2-脱氧-ADP-ribose (2dADPR) 比ADP-ribose (ADPR) 更有效地激活TRPM2通道. 这表明2dADPR是先天免疫反应的主要生理激活剂.
科学领域:
- 分子生物学分子生物学
- 免疫学 免疫学 免疫学
- 道生理学 道生理学
背景情况:
- TRPM2是一种具有透性的阴离子通道,对天生的免疫至关重要,调节中性粒细胞和单细胞/巨细胞的功能.
- 细胞内腺核酸,ADP-ribose (ADPR) 和2'-deoxy-ADPR (2dADPR),以及Ca2+,激活TRPM2.2. 这些核酸与Ca2+一起激活TRPM2.
- 2dADPR比ADPR更有效地激活人类TRPM2 (hsTRPM2),但该机制仍然不清楚.
研究的目的:
- 阐明 hsTRPM2 通过 ADPR 和 2dADPR 的差异激活背后的分子机制.
- 为了比较ADPR对hsTRPM2的Ca2+灵敏度和激活动态与2dADPR.
主要方法:
- 在表达hsTRPM2.2的HEK293细胞中,全细胞补丁的电生理学.
- 对Ca2+灵敏度 (EC50) 和激活动态的分析.
- 针对hsTRPM2 (智商类似动机和W1355A残留物) 的局部定向突变发生.
主要成果:
- 2dADPR的Ca2+灵敏度大约是ADPR的4倍 (EC50:190nm与690nm对比).
- 动态分析显示,2dADPR与ADPR相比,通过2dADPR更快地激活hsTRPM2.
- 在N端IQ样动机中的突变取消了两种激动剂的激活,而W1355A突变减缓了2dADPR激活和均等的速率.
结论:
- 2dADPR主要通过更快的通道激活动力学诱导比ADPR更大的hsTRPM2电流.
- 2dADPR的较高的Ca2+敏感性允许在生理细胞内Ca2+水平上激活.
- 这些发现表明,2dADPR是免疫环境中hsTRPM2的主要生理激活剂.
更多相关视频
08:27Expression and Purification of the Human Lipid-sensitive Cation Channel TRPC3 for Structural Determination by Single-particle Cryo-electron Microscopy
Published on: January 7, 2019
12:09Yeast Luminometric and Xenopus Oocyte Electrophysiological Examinations of the Molecular Mechanosensitivity of TRPV4
Published on: December 31, 2013
相关概念视频
Calmodulin-dependent Signaling
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
Feedback Regulation of Calcium Concentration
Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...
Mechanically-gated Ion Channels
G-Protein Gated Ion Channels
Sensory...
Ligand-Gated Ion Channel Receptor: Gating Mechanism
Adrenergic Receptors: β Subtype
Isoprenaline > Adrenaline > Noradrenaline
Neurotransmitter binding to these receptors causes activation of adenylyl cyclase resulting in increased concentrations of cAMP and modulation of calcium ion channels within the cell. They are further classified into β1, β2, and β3 subtypes.
β1-adrenoceptors: β1-adrenoceptors...
