Arginine Methylation Initiates BMP-Induced Smad Signaling.

Arginine Methylation Initiates BMP-Induced Smad Signaling.
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DOI:
10.1016/j.molcel.2013.05.004
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发表时间:
2013-07-11
期刊:
影响因子:
16
通讯作者:
Derynck, Rik
Derynck, Rik
中科院分区:
生物学1区
文献类型:
--
作者:
Xu, Jian;Wang, A. Hongjun;Oses-Prieto, Juan;Makhijani, Kalpana;Katsuno, Yoko;Pei, Ming;Yan, Leilei;Zheng, Y. George;Burlingame, Alma;Brueckner, Katja;Derynck, Rik

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激酶活化和底物磷酸化通常构成信号级联的主干。骨形态发生蛋白(BMPs)是TGF-β家族配体的一个亚类,通过跨膜受体激酶的c端磷酸化诱导其信号效应器Smads的激活。然而,响应BMP的Smad激活的缓慢动力学表明,在BMP信号的启动之前有一个步骤。我们现在表明精氨酸甲基化,已知可以调节基因表达,但也可以修饰一些信号介质,启动bmp诱导的Smad信号。bmp诱导的受体复合物的形成促进了甲基转移酶PRMT1与抑制性Smad6的相互作用,导致Smad6在受体上甲基化和重新定位,从而通过磷酸化激活效应Smads。PRMT1是BMP诱导的跨物种生物反应所必需的,其同源物dar1在果蝇翅膀发育过程中BMP信号传导中的作用证明了这一点。精氨酸甲基化激活的信号传导也可能适用于其他信号传导途径。
Kinase activation and substrate phosphorylation commonly form the backbone of signaling cascades. Bone morphogenetic proteins (BMPs), a subclass of TGF-β family ligands, induce activation of their signaling effectors, the Smads, through C-terminal phosphorylation by transmembrane receptor kinases. However, the slow kinetics of Smad activation in response to BMP suggests a preceding step in the initiation of BMP signaling. We now show that arginine methylation, which is known to regulate gene expression, yet also modifies some signaling mediators, initiates BMP-induced Smad signaling. BMP-induced receptor complex formation promotes interaction of the methyltransferase PRMT1 with the inhibitory Smad6, resulting in Smad6 methylation and relocalization at the receptor, leading to activation of effector Smads through phosphorylation. PRMT1 is required for BMP-induced biological responses across species, as evidenced by the role of its ortholog Dart1 in BMP signaling during Drosophila wing development. Activation of signaling by arginine methylation may also apply to other signaling pathways.
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