MLK3 limits activated Galphaq signaling to Rho by binding to p63RhoGEF.

MLK3 limits activated Galphaq signaling to Rho by binding to p63RhoGEF.
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DOI:
10.1016/j.molcel.2008.09.007
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发表时间:
2008-10-10
期刊:
影响因子:
16
通讯作者:
Means, Anthony R.
Means, Anthony R.
中科院分区:
生物学1区
文献类型:
--
作者:
Swenson-Fields, Katherine I.;Sandquist, Joshua C.;Rossol-Allison, Jessica;Blat, Irene C.;Wennerberg, Krister;Burridge, Keith;Means, Anthony R.

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混合谱系激酶3 (MLK3)是一种激活jnk依赖性MAPK通路的MAP3K。在这里,我们证明了MLK3是细胞迁移所必需的,其作用与MAP3K或MLK3激酶活性无关。相反,MLK3通过与Rho激活剂p63RhoGEF/GEFT结合,以一种受调节的方式限制激活的GTPase Rho的水平,而Rho激活剂p63RhoGEF/GEFT反过来阻止其被g - αq激活。这些发现证明了MLK3在控制Rho激活程度、调节细胞迁移方面的支架作用。此外,他们认为MLK3作为连接许多信号通路的网络集线器起作用。
Mixed lineage kinase 3 (MLK3) is a MAP3K that activates the JNK-dependent MAPK pathways. Here we show that MLK3 is required for cell migration in a manner independent of its role as a MAP3K or MLK3 kinase activity. Rather, MLK3 functions in a regulated way to limit levels of the activated GTPase, Rho, by binding to the Rho activator, p63RhoGEF/GEFT, which, in turn, prevents its activation by Gαq. These findings demonstrate a scaffolding role for MLK3 in controlling the extent of Rho activation that modulates cell migration. Moreover, they suggest that MLK3 functions as a network hub that links a number of signaling pathways.
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