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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Functional Comparison Of Rgs9 Splice Isoforms In A Living Cell
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Functional Comparison Of Rgs9 Splice Isoforms In A Living Cell

机译:Rgs9剪接同工型在活细胞中的功能比较

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Two isoforms of the GTPase-activating protein, regulator of G protein signaling 9 (RGS9), control such fundamental functions as vision and behavior. RGS9-1 regulates phototransduction in rods and cones, and RGS9-2 regulates dopamine and opioid signaling in the basal ganglia. To determine their functional differences in the same intact cell, we replaced RGS9-1 with RGS9-2 in mouse rods. Surprisingly, RGS9-2 not only supported normal photore-sponse recovery under moderate light conditions but also outperformed RGS9-1 in bright light. This versatility of RGS9-2 results from its ability to inactivate the G protein, transducin, regardless of its effector interactions, whereas RGS9-1 prefers the G protein-effector complex. Such versatility makes RGS9-2 an isoform advantageous for timely signal inactivation across a wide range of stimulus strengths and may explain its predominant representation throughout the nervous system.
机译:GTPase激活蛋白的两种同工型,即G蛋白信号传导9(RGS9)的调节剂,控制着视觉和行为等基本功能。 RGS9-1调节杆和视锥细胞中的光转导,而RGS9-2调节基底神经节中的多巴胺和阿片样物质信号传导。为了确定它们在同一完整细胞中的功能差异,我们在小鼠杆中将RGS9-1替换为RGS9-2。令人惊讶的是,RGS9-2不仅在中等光照条件下支持正常的光响应恢复,而且在强光条件下的表现也优于RGS9-1。 RGS9-2的这种多功能性是由其失活G蛋白(转导蛋白)的能力引起的,而不论其效应子相互作用如何,而RGS9-1则更喜欢G蛋白效应物复合物。这种多功能性使RGS9-2成为一种异构体,有利于在各种刺激强度下及时使信号失活,并且可以解释其在整个神经系统中的主要表现。

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