Src signaling in a low-complexity unicellular kinome.

Src signaling in a low-complexity unicellular kinome.
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DOI:
10.1038/s41598-018-23721-8
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发表时间:
2018-03-29
期刊:
影响因子:
4.6
通讯作者:
Miller WT
Miller WT
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Suga H;Miller WT

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Creolimax fragrantissima 是鱼孢子分支的成员,这是最早的分支全动物谱系。与后生动物相比,Creolimax 的激酶组显着减少。特别是,Creolimax 拥有单一非受体酪氨酸激酶:CfrSrc,c-Src 激酶的同源物。 CfrSrc 是一种活性酪氨酸激酶,在 Creolimax 的整个生命周期中表达。在动物细胞中,Src 的调节机制涉及 Csk 激酶在 C 末端位点的酪氨酸磷酸化。 Creolimax 中缺乏 Csk 表明 CfrSrc 必须存在不同的负调节模式。我们证明,CfrPTP-3(Creolimax 中的 7 种酪氨酸特异性磷酸酶 (PTP) 之一)可在体外和体内抑制 CfrSrc 活性。在 Creolimax 生命周期的活动变形虫和固着多核阶段,CfrPTP-3 和其他两种 PTP 的转录水平显着高于 CfrSrc。因此,在激酶组高度减少的情况下,先前存在的 PTP 可能已被选为 Src 调节的角色。 Creolimax 代表了一个独特的模型系统,用于研究酪氨酸激酶信号传导和调节机制的适应。
Creolimax fragrantissima is a member of the ichthyosporean clade, the earliest branching holozoan lineage. The kinome of Creolimax is markedly reduced as compared to those of metazoans. In particular, Creolimax possesses a single non-receptor tyrosine kinase: CfrSrc, the homolog of c-Src kinase. CfrSrc is an active tyrosine kinase, and it is expressed throughout the lifecycle of Creolimax. In animal cells, the regulatory mechanism for Src involves tyrosine phosphorylation at a C-terminal site by Csk kinase. The lack of Csk in Creolimax suggests that a different mode of negative regulation must exist for CfrSrc. We demonstrate that CfrPTP-3, one of the 7 tyrosine-specific phosphatases (PTPs) in Creolimax, suppresses CfrSrc activity in vitro and in vivo. Transcript levels of CfrPTP-3 and two other PTPs are significantly higher than that of CfrSrc in the motile amoeboid and sessile multinucleate stages of the Creolimax life cycle. Thus, in the context of a highly reduced kinome, a pre-existing PTP may have been co-opted for the role of Src regulation. Creolimax represents a unique model system to study the adaptation of tyrosine kinase signaling and regulatory mechanisms.
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