Npr2 inhibits TORC1 to prevent inappropriate utilization of glutamine for biosynthesis of nitrogen-containing metabolites.

Npr2 inhibits TORC1 to prevent inappropriate utilization of glutamine for biosynthesis of nitrogen-containing metabolites.
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NPR2抑制TORC1,以防止谷氨酰胺用于含氮代谢物的生物合成的不适当利用。

DOI:
10.1126/scisignal.2005948
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发表时间:
2014-12-16
期刊:
影响因子:
7.3
通讯作者:
Tu BP
Tu BP
中科院分区:
生物学1区
文献类型:
--
作者:
Laxman S;Sutter BM;Shi L;Tu BP

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细胞必须能够在不可预测的营养环境中在生长和自噬之间切换。缺乏保守的Iml 1/Npr 2/Npr 3复合物(也称为SEACIT)的酵母细胞,TORC 1的负调节因子,可以绕过自噬并在特定的营养限制期间增殖。我们确定Npr 2缺陷型细胞在需要氧化代谢的限制下表现出与WT细胞非常不同的代谢状态。npr 2 Δ细胞消耗大量的谷氨酰胺来满足其对氮的需求,而不是积累谷氨酰胺,并保持高的S-腺苷甲硫氨酸(SAM)浓度来促进生长。此外,在正常细胞中,甲硫氨酸的添加刺激谷氨酰胺的合成含氮代谢产物的消耗,显示如何硫氨基酸线索与氮利用集成。这些数据揭示了Iml 1/Npr 2/Npr 3复合物调节细胞稳态的代谢基础,并证明了TORC 1在调节谷氨酰胺作为氮源的合成和利用中的关键功能。
Cells must be capable of switching between growth and autophagy in unpredictable nutrient environments. Yeast cells lacking the conserved Iml1/Npr2/Npr3 complex (also called SEACIT), a negative regulator of TORC1, can bypass autophagy and proliferate during specific nutrient limitations. We determined that Npr2-deficient cells exhibit a metabolic state that is very distinct from WT cells under such limitations that demand oxidative metabolism. Instead of accumulating glutamine, npr2Δ cells consumed substantial amounts of glutamine to satisfy their demands for nitrogen, and maintained high S-adenosyl methionine (SAM) concentrations to fuel growth. Moreover, in normal cells, methionine addition stimulated glutamine consumption for synthesis of nitrogenous metabolites, showing how a sulfur amino acid cue is integrated with nitrogen utilization. These data reveal the metabolic basis by which the Iml1/Npr2/Npr3 complex regulates cellular homeostasis and demonstrate a key function for TORC1 in regulating the synthesis and utilization of glutamine as a nitrogen source.
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