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Components of the Gs signaling cascade exhibit distinct changes in mobility and membrane domain localization upon β2 -adrenergic receptor activation.
Traffic ( IF 3.6 ) Pub Date : 2020-03-11 , DOI: 10.1111/tra.12724
Alexey Bondar 1, 2, 3, 4 , Wonjo Jang 1 , Ekaterina Sviridova 2 , Nevin A Lambert 1
Affiliation  

The G protein signaling cascade is a key player in cell signaling. Cascade activation leads to a redistribution of its members in various cellular compartments. These changes are likely related to the “second wave” of signaling from endosomes. Here, we set out to determine whether Gs signaling cascade members expressed at very low levels exhibit altered mobility and localize in clathrin‐coated structures (CCSs) or caveolae upon activation by β2‐adrenergic receptors (β2AR). Activated β2AR showed decreased mobility and sustained accumulation in CCSs but not in caveolae. Arrestin 3 translocated to the plasma membrane after β2AR activation and showed very low mobility and pronounced accumulation in CCSs. In contrast, Gαs and Gγ2 exhibited a modest reduction in mobility but no detectable accumulation in or exclusion from CCSs or caveolae. The effector adenylyl cyclase 5 (AC5) showed a slight mobility increase upon β2AR stimulation, no redistribution to CCSs, and weak activation‐independent accumulation in caveolae. Our findings show an overall decrease in the mobility of most activated Gs signaling cascade members and confirm that β2AR and arrestin 3 accumulate in CCSs, while Gαs, Gγ2 and AC5 can transiently enter CCSs and caveolae but do not accumulate in and are not excluded from these domains.

中文翻译:

当β2-肾上腺素能受体激活时,Gs信号级联反应的成分在迁移率和膜结构域定位方面表现出明显的变化。

G蛋白信号传导级联是细胞信号传导的关键参与者。级联激活导致其成员在各种细胞室中的重新分布。这些变化可能与来自内体的信号传递的“第二波”有关。在这里,我们着手确定是否ģ小号在非常低的水平表达的信号级联的成员由β在活化时表现出改变的迁移率和本地化网格蛋白涂覆的结构(的CCS)或细胞膜穴样内陷2 -肾上腺素能受体(β 2 AR)。激活β 2 AR在胞膜窖表现为流动性下降和持续积累的CCS但不是。抑制蛋白3易位到质膜β后2AR激活并在CCS中显示出极低的迁移率和明显的积累。与此相反,Gα小号和Gγ 2表现出的迁移率适度减少,但在没有可检测的积聚或排斥的CCS或小窝。效应腺苷酸环化酶5(AC5)显示在β的轻微移动性增加2 AR刺激,无再分配的CCS,和在胞膜窖弱活化无关的积累。我们的发现显示在大部分激活G中的迁移率的总体降低小号信号级联的成员,并确认β 2 AR和休止3在累积的CCS,而Gα小号,Gγ 2 AC5和AC5可以暂时进入CCS和小窝,但不会积聚,也不会被排除在这些域之外。
更新日期:2020-03-12
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