Nemo phosphorylates Eyes absent and enhances output from the Eya-Sine oculis transcriptional complex during Drosophila retinal determination.

Nemo phosphorylates Eyes absent and enhances output from the Eya-Sine oculis transcriptional complex during Drosophila retinal determination.
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DOI:
10.1016/j.ydbio.2012.02.030
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发表时间:
2012-05-01
影响因子:
2.7
通讯作者:
Rebay I
Rebay I
中科院分区:
生物学3区
文献类型:
--
作者:
Morillo SA;Braid LR;Verheyen EM;Rebay I

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视网膜决定基因网络包含一组转录因子,这些转录因子对多种信号输入作出反应以指导果蝇眼睛发育。先前的遗传学研究表明,nemo(nmo)是一种编码脯氨酸定向丝氨酸/苏氨酸激酶的基因,可以通过与视网膜决定基因网络的相互作用来促进视网膜规范化,尽管串扰的分子点尚未确定。在这里,我们报告 Nemo 激酶积极且直接地调节眼睛缺失 (Eya)。遗传分析表明,Nmo 催化活性增强了 Eya 介导的异位眼形成,并增强了 Eya-Sine oculis (So) 转录目标腊肠犬和菱形的诱导。生化分析表明,Nmo 与 Eya 形成复合物,并在两个共有丝裂原激活蛋白激酶 (MAPK) 磷酸化位点磷酸化 Eya。这些相同的位点对于体内 Nmo 介导的 Eya 功能激活至关重要。因此,我们认为 Eya 的 Nmo 磷酸化增强了其反式激活功能,从而在眼睛特化和发育过程中增强 Eya-So 靶基因的转录。
The retinal determination gene network comprises a collection of transcription factors that respond to multiple signaling inputs to direct Drosophila eye development. Previous genetic studies have shown that nemo (nmo), a gene encoding a proline-directed serine/threonine kinase, can promote retinal specification through interactions with the retinal determination gene network, although the molecular point of cross-talk was not defined. Here, we report that the Nemo kinase positively and directly regulates Eyes absent (Eya). Genetic assays show that Nmo catalytic activity enhances Eya-mediated ectopic eye formation and potentiates induction of the Eya-Sine oculis (So) transcriptional targets dachshund and lozenge. Biochemical analyses demonstrate that Nmo forms a complex with and phosphorylates Eya at two consensus mitogen-activated protein kinase (MAPK) phosphorylation sites. These same sites appear crucial for Nmo-mediated activation of Eya function in vivo. Thus, we propose that Nmo phosphorylation of Eya potentiates its transactivation function to enhance transcription of Eya-So target genes during eye specification and development.
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