Control of signaling in a MAP-kinase pathway by an RNA-binding protein.

Control of signaling in a MAP-kinase pathway by an RNA-binding protein.
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DOI:
10.1371/journal.pone.0000249
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发表时间:
2007-02-28
期刊:
影响因子:
3.7
通讯作者:
Galitski T
Galitski T
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Prinz S;Aldridge C;Ramsey SA;Taylor RJ;Galitski T

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信号蛋白mRNA往往具有长的非翻译区(UTR),其中含有调节基因表达的RNA结合蛋白的结合位点。在这里,我们表明,PUF家族的RNA结合蛋白,Mpt 5,抑制酵母MAP激酶途径控制分化为丝状形式。Mpt 5抑制两种途径组分的蛋白水平,即Ste 7 MAP激酶激酶和Tec 1转录激活因子,并负调节Kss 1 MAP激酶的激酶活性。此外,Mpt 5在没有刺激的情况下特异性地抑制该途径的输出,从而防止不适当的细胞分化。这些结果提供了一个例子,说明在信号网络和蛋白质-RNA结合网络的界面上可能存在基因组水平的调控。
Signaling-protein mRNAs tend to have long untranslated regions (UTRs) containing binding sites for RNA-binding proteins regulating gene expression. Here we show that a PUF-family RNA-binding protein, Mpt5, represses the yeast MAP-kinase pathway controlling differentiation to the filamentous form. Mpt5 represses the protein levels of two pathway components, the Ste7 MAP-kinase kinase and the Tec1 transcriptional activator, and negatively regulates the kinase activity of the Kss1 MAP kinase. Moreover, Mpt5 specifically inhibits the output of the pathway in the absence of stimuli, and thereby prevents inappropriate cell differentiation. The results provide an example of what may be a genome-scale level of regulation at the interface of signaling networks and protein-RNA binding networks.
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