The Control of semaphorin-1a-mediated reverse signaling by opposing pebble and RhoGAPp190 functions in drosophila.

The Control of semaphorin-1a-mediated reverse signaling by opposing pebble and RhoGAPp190 functions in drosophila.
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DOI:
10.1016/j.neuron.2012.09.018
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发表时间:
2012-11-21
期刊:
影响因子:
16.2
通讯作者:
Kolodkin AL
Kolodkin AL
中科院分区:
医学1区
文献类型:
--
作者:
Jeong S;Juhaszova K;Kolodkin AL

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跨膜信号蛋白(Semas)具有进化保守的指导作用,有些同时作为配体和受体。然而,这些信号转导到细胞骨架的分子机制在很大程度上仍然未知。我们已经确定了两个Rho家族小GTPase的直接调节因子,卵石(Rho鸟嘌呤核苷酸交换因子(GEF))和RhoGAPp190 (GTPase激活蛋白(GAP)),它们与果蝇Sema-1a蛋白的细胞质结构域具有强大的相互作用。在果蝇神经肌肉发育过程中,需要神经元卵石和RhoGAPp190在特定的通路选择点控制运动轴突的去血循环,也需要对目标进行识别。sema -1a介导的运动轴突去血循环由鹅卵石促进,RhoGAPp190抑制。遗传分析表明,相反的鹅卵石和RhoGAPp190功能通过调节Rho1活性介导Sema-1a反向信号传导。因此,在果蝇发育过程中,pebble和RhoGAPp190传递跨膜信号蛋白介导的引导线索信息,调节神经元连接的建立。
Transmembrane semaphorins (Semas) serve evolutionarily conserved guidance roles, and some function as both ligands and receptors. However, the molecular mechanisms underlying the transduction of these signals to the cytoskeleton remain largely unknown. We have identified two direct regulators of Rho family small GTPases, pebble (a Rho guanine nucleotide exchange factor (GEF)) and RhoGAPp190 (a GTPase activating protein (GAP)), that show robust interactions with the cytoplasmic domain of the Drosophila Sema-1a protein. Neuronal pebble and RhoGAPp190 are required to control motor axon defasciculation at specific pathway choice points and also for target recognition during Drosophila neuromuscular development. Sema-1a–mediated motor axon defasciculation is promoted by pebble and inhibited by RhoGAPp190. Genetic analyses show that opposing pebble and RhoGAPp190 functions mediate Sema-1a reverse signaling through the regulation of Rho1 activity. Therefore, pebble and RhoGAPp190 transduce transmembrane semaphorin–mediated guidance cue information that regulates the establishment of neuronal connectivity during Drosophila development.
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