GATOR1 regulates nitrogenic cataplerotic reactions of the mitochondrial TCA cycle.

GATOR1 regulates nitrogenic cataplerotic reactions of the mitochondrial TCA cycle.
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DOI:
10.1038/nchembio.2478
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发表时间:
2017-11
影响因子:
14.8
通讯作者:
Tu BP
Tu BP
中科院分区:
生物学1区
文献类型:
--
作者:
Chen J;Sutter BM;Shi L;Tu BP

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由Iml 1-Npr 2-Npr 3组成的GATOR 1/SEACIT复合物响应于氨基酸不足而抑制雷帕霉素复合物1的靶标(TORC 1)。在葡萄糖培养基中,缺乏该复合物功能的酿酒酵母突变体在没有氨基酸补充的情况下生长不良,尽管具有增加的TORC 1信号传导的特征。这种突变体认为它们是氨基酸充足的,因此抑制了对实现这种状态很重要的代谢活动。我们发现npr 2 Δ突变体具有缺陷的线粒体TCA循环活性和逆行反应。补充谷氨酰胺,特别是天冬氨酸,这是TCA循环中间体的含氮形式,拯救npr 2 Δ突变体的生长。这些氨基酸然后在需要氮来支持增殖代谢的生物合成途径中消耗。我们的研究结果表明,TORC 1的负调节因子如GATOR 1/SEACIT调节TCA循环中这些氨基酸的cataplerotic合成,与细胞的氨基酸和氮状态一致。
The GATOR1/SEACIT complex consisting of Iml1-Npr2-Npr3 inhibits Target of Rapamycin Complex 1 (TORC1) in response to amino acid insufficiency. In glucose medium, Saccharomyces cerevisiae mutants lacking the function of this complex grow poorly in the absence of amino acid supplementation, despite hallmarks of increased TORC1 signaling. Such mutants perceive they are amino acid-replete and thus repress metabolic activities that are important for achieving this state. We find that npr2Δ mutants have defective mitochondrial TCA cycle activity and retrograde response. Supplementation of glutamine, and especially aspartate, which are nitrogen-containing forms of TCA cycle intermediates, rescue growth of npr2Δ mutants. These amino acids are then consumed in biosynthetic pathways that require nitrogen to support proliferative metabolism. Our findings reveal that negative regulators of TORC1 such as GATOR1/SEACIT regulate the cataplerotic synthesis of these amino acids from the TCA cycle in tune with the amino acid and nitrogen status of cells.
DOI: 10.1128/jb.170.2.708-713.1988
发表时间: 1988-02-01
影响因子: 3.2
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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
发表时间: 2014-12-16
期刊: Science signaling
影响因子: 7.3
作者:
Laxman S;Sutter BM;Shi L;Tu BP
通讯作者: Tu BP