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A single amino acid residue controls Ca2+ signaling by an octopamine receptor from Drosophila melanogaster

机译:一个氨基酸残基通过果蝇的章鱼胺受体控制Ca2 +信号传导

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摘要

Rhythmic activity of cells and cellular networks plays an important role in physiology. In the nervous system oscillations of electrical activity and/or second messenger concentrations are important to synchronize neuronal activity. At the molecular level, rhythmic activity can be initiated by different routes. We have recently shown that an octopamine-activated G-protein-coupled receptor (GPCR; DmOctα1Rb, CG3856) from Drosophila initiates Ca2+ oscillations. Here, we have unraveled the molecular basis of cellular Ca2+ signaling controlled by the DmOctα1Rb receptor using a combination of pharmacological intervention, site-directed mutagenesis, and functional cellular Ca2+ imaging on heterologously expressed receptors. Phosphorylation of a single amino acid residue in the third intracellular loop of the GPCR by PKC is necessary and sufficient to desensitize the receptor. From its desensitized state, DmOctα1Rb is resensitized by dephosphorylation, and a new Ca2+ signal occurs on octopamine stimulation. Our findings show that transient changes of the receptor's surface profile have a strong effect on its physiological signaling properties. We expect that the detailed knowledge of DmOctα1Rb-dependent signal transduction fosters the identification of specific drugs that can be used for GPCR-mediated pest control, since octopamine serves important physiological and behavioral functions in arthropods.—Hoff M., Balfanz, S., Ehling, P., Gensch, T., Baumann, A. A single amino acid residue controls Ca2+ signaling by an octopamine receptor from Drosophila melanogaster.
机译:细胞和细胞网络的节律活动在生理学中起重要作用。在神经系统中,电活动和/或第二信使浓度的振荡对于同步神经元活动很重要。在分子水平上,节律活性可以通过不同的途径引发。我们最近发现,果蝇中的一种由章鱼胺激活的G蛋白偶联受体(GPCR;DmOctα1Rb,CG3856)引发Ca 2 + 振荡。在这里,我们通过药理学干预,定点诱变和功能性细胞Ca 2 + 2 + 信号传导的分子基础。 >在异源表达的受体上成像。 PKC在GPCR的第三个细胞内环中对单个氨基酸残基进行磷酸化是必要的,并且足以使受体脱敏。从脱敏状态开始,DmOctα1Rb通过脱磷酸作用重新敏化,并且在章鱼胺刺激下出现新的Ca 2 + 信号。我们的发现表明,受体表面轮廓的瞬时变化对其生理信号传导特性具有强烈影响。我们希望对DmOctα1Rb依赖的信号转导的详细了解能促进对可用于GPCR介导的害虫控制的特定药物的鉴定,因为章鱼胺在节肢动物中起着重要的生理和行为功能。-HoffM.,Balfanz,S., Ehling,P.,Gensch,T.,Baumann,A.单个氨基酸残基通过果蝇中的章鱼胺受体控制Ca 2 + 信号传导。

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