PKA modulates iron trafficking in the striatum via small GTPase, Rhes.

PKA modulates iron trafficking in the striatum via small GTPase, Rhes.
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DOI:
10.1016/j.neuroscience.2013.08.043
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发表时间:
2013-12-03
期刊:
影响因子:
3.3
通讯作者:
Kim, S. F.
Kim, S. F.
中科院分区:
医学3区
文献类型:
--
作者:
Choi, B. -R.;Bang, S.;Chen, Y.;Cheah, J. H.;Kim, S. F.

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Rhes是一种高度保守的小GTP结合蛋白,属于Ras超家族。Rhes通过腺苷酸环化酶参与多巴胺受体介导的信号传导和行为。纹状体特异性GTPase与Dexras1具有密切的同源性,Dexras1通过一氧化氮(NO)的翻译后修饰s-亚硝基化激活来调节神经元中的铁运输。我们报道Rhes在生理上与PAP7相互作用,并通过DMT1参与铁摄取,类似于Dexras1。有趣的是,Rhes并没有被no处理后的s -亚硝基化,而是被蛋白激酶A (PKA)在丝氨酸-239位点磷酸化。两种Rhes突变体——拟磷形式(丝氨酸239转化为天冬氨酸)和组成活性形式(丙氨酸173转化为缬氨酸)——与野生型Rhes相比,表现出铁摄取的增加。这些发现表明Rhes可能在纹状体铁稳态中起关键作用。
Rhes, Ras homolog enriched in striatum (Rhes), is a highly conserved small GTP binding protein belonging to the Ras superfamily. Rhes is involved in the dopamine receptor-mediated signaling and behavior though adenylyl cyclase. The striatum-specific GTPase shares a close homology with Dexras1, which regulates iron trafficking in the neurons when activated though the post-translational modification called s-nitrosylation by nitric oxide (NO). We report that Rhes physiologically interacted with PAP7 and participated in iron uptake via DMT1 similar to Dexras1. Interestingly, Rhes is not S-nitrosylated by NO-treatment, however phosphorylated by Protein Kinase A (PKA) at the site of serine-239. Two Rhes mutants - the phosphomimetic form (serine 239 to aspartic acid) and constitutively active form (alanine 173 to valine) - displayed an increase in iron uptake compared to the wild type Rhes. These findings suggest that Rhes may play a crucial role in striatal iron homeostasis.
Dexras1是一种小的GTPase,是谷氨酸-NMDA神经毒性所必需的。
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