Spatial alterations of De Novo purine biosynthetic enzymes by Akt-independent PDK1 signaling pathways.

Spatial alterations of De Novo purine biosynthetic enzymes by Akt-independent PDK1 signaling pathways.
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DOI:
10.1371/journal.pone.0195989
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发表时间:
2018
期刊:
影响因子:
3.7
通讯作者:
An S
An S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Schmitt DL;Sundaram A;Jeon M;Luu BT;An S

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参与人类从头合成嘌呤的酶的大分子复合物,嘌呤酶体,已被证明是由一个核心组装来调节该途径的代谢活性。然而,核心组装本身是否可以在细胞质中选择性地控制而不促进嘌呤酶体,仍然是一个谜。在这里,我们揭示了3-磷酸肌醇依赖性蛋白激酶1 (PDK1)的细胞质活性的药物抑制选择性地促进了核心组装的形成,而不是嘌呤酶体的形成。然而,与质膜结合PDK1活性相关的其他信号级联反应,包括akt介导的级联反应,在我们的条件下既不调节核心组装也不调节嘌呤酶体。通过免疫荧光显微镜和使用小干扰rna对PDK1的敲除研究,我们发现细胞质PDK1相关的信号通路以akt不依赖的方式调节形成嘌呤小体核心组装的三种酶的亚细胞共定位。总的来说,这项研究揭示了一种由空间分辨信号通路控制的嘌呤生物合成酶区隔化的新模式。
A macromolecular complex of the enzymes involved in human de novo purine biosynthesis, the purinosome, has been shown to consist of a core assembly to regulate the metabolic activity of the pathway. However, it remains elusive whether the core assembly itself can be selectively controlled in the cytoplasm without promoting the purinosome. Here, we reveal that pharmacological inhibition of the cytoplasmic activity of 3-phosphoinositide-dependent protein kinase 1 (PDK1) selectively promotes the formation of the core assembly, but not the purinosome, in cancer cells. However, alternative signaling cascades that are associated with the plasma membrane-bound PDK1 activity, including Akt-mediated cascades, regulate neither the core assembly nor the purinosome in our conditions. Along with immunofluorescence microscopy and a knock-down study against PDK1 using small interfering RNAs, we reveal that cytoplasmic PDK1-associated signaling pathways regulate subcellular colocalization of three enzymes that form the core assembly of the purinosome in an Akt-independent manner. Collectively, this study reveals a new mode of compartmentalization of purine biosynthetic enzymes controlled by spatially resolved signaling pathways.
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