Tyr26 phosphorylation of PGAM1 provides a metabolic advantage to tumours by stabilizing the active conformation.

Tyr26 phosphorylation of PGAM1 provides a metabolic advantage to tumours by stabilizing the active conformation.
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DOI:
10.1038/ncomms2759
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发表时间:
2013
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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致癌信号如何协调癌细胞中的糖酵解和合成代谢生物合成仍不清楚。我们最近报道,糖酵解酶磷酸甘油酸变位酶 1 (PGAM1) 通过控制其底物 3-磷酸甘油酸 (3-PG) 和产物 2-磷酸甘油酸 (2-PG) 的细胞内水平来调节合成代谢生物合成。在这里,我们报告了一种新机制,其中 Y26 磷酸化通过释放抑制性 E19 来增强 PGAM1 激活,E19 阻断活性位点,稳定辅因子 2,3-二磷酸甘油酸结合和 H11 磷酸化。我们还报道了 H11 磷酸化 PGAM1 的晶体结构,并发现磷酸化 H11 至少部分通过促进底物 3-PG 结合来激活 PGAM1。此外,PGAM1的Y26磷酸化在人类癌细胞中很常见,有助于调节3-PG和2-PG水平,促进癌细胞增殖和肿瘤生长。由于 PGAM1 作为 TP53 的负转录靶标在人类癌症中通常上调,因此这些发现表明 Y26 磷酸化代表了 PGAM1 上调的另一个急性机制。
How oncogenic signalling coordinates glycolysis and anabolic biosynthesis in cancer cells remains unclear. We recently reported that the glycolytic enzyme phosphoglycerate mutase 1 (PGAM1) regulates anabolic biosynthesis by controlling intracellular levels of its substrate 3-phosphoglycerate (3-PG) and product 2-phosphoglycerate (2-PG). Here we report a novel mechanism in which Y26 phosphorylation enhances PGAM1 activation through release of inhibitory E19 that blocks the active site, stabilising cofactor 2,3-bisphosphoglycerate binding and H11 phosphorylation. We also report the crystal structure of H11-phosphorylated PGAM1 and find that phospho-H11 activates PGAM1 at least in part by promoting substrate 3-PG binding. Moreover, Y26-phosphorylation of PGAM1 is common in human cancer cells and contributes to regulation of 3-PG and 2-PG levels, promoting cancer cell proliferation and tumour growth. Since PGAM1 as a negative transcription target of TP53 is commonly upregulated in human cancers, these findings suggest that Y26 phosphorylation represents an additional acute mechanism underlying PGAM1 upregulation.
磷酸甘油酸变位酶 1 作为肝细胞癌新治疗靶点的定量蛋白质组学鉴定
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