Regulation of cargo exocytosis by a Reps1-Ralbp1-RalA module.

Regulation of cargo exocytosis by a Reps1-Ralbp1-RalA module.
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DOI:
10.1126/sciadv.ade2540
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发表时间:
2023-02-22
期刊:
影响因子:
13.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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膜蛋白的表面水平由胞吐介导的表面递送和从细胞表面的胞吞依赖性回收之间的动态平衡决定。表面蛋白水平的不平衡扰乱了表面蛋白的体内平衡,并导致主要形式的人类疾病,如2型糖尿病和神经系统疾病。在这里,我们发现了一个Reps 1-Ralbp 1-RalA模块在胞外途径广泛调节表面蛋白水平。Reps 1和Ralbp 1形成识别RalA的二元复合物,RalA是囊泡结合的小鸟苷三磷酸酶(GTdase),其通过与外囊复合物相互作用促进胞吐作用。RalA结合导致Reps 1释放并形成Ralbp 1-RalA二元复合物。Ralbp 1选择性识别GT结合的RalA,但不是RalA效应子。相反,Ralbp 1结合使RalA保持在活跃的GTP结合状态。这些研究揭示了胞吐途径中的一个片段,更广泛地说,揭示了以前未被认识到的小GTP酶的调节机制,GTP状态稳定化。Reps 1-Ralbp 1-RalA模块促进货物胞吐,其中Ralbp 1通过GTP状态稳定化调节RalA。
Surface levels of membrane proteins are determined by a dynamic balance between exocytosis-mediated surface delivery and endocytosis-dependent retrieval from the cell surface. Imbalances in surface protein levels perturb surface protein homeostasis and cause major forms of human disease such as type 2 diabetes and neurological disorders. Here, we found a Reps1-Ralbp1-RalA module in the exocytic pathway broadly regulating surface protein levels. Reps1 and Ralbp1 form a binary complex that recognizes RalA, a vesicle-bound small guanosine triphosphatases (GTPase) promoting exocytosis through interacting with the exocyst complex. RalA binding results in Reps1 release and formation of a Ralbp1-RalA binary complex. Ralbp1 selectively recognizes GTP-bound RalA but is not a RalA effector. Instead, Ralbp1 binding maintains RalA in an active GTP-bound state. These studies uncovered a segment in the exocytic pathway and, more broadly, revealed a previously unrecognized regulatory mechanism for small GTPases, GTP state stabilization. A Reps1-Ralbp1-RalA module promotes cargo exocytosis, in which Ralbp1 regulates RalA through GTP-state stabilization.
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