A genetically encoded tool for manipulation of NADP(+)/NADPH in living cells.

A genetically encoded tool for manipulation of NADP(+)/NADPH in living cells.
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DOI:
10.1038/nchembio.2454
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发表时间:
2017-10
影响因子:
14.8
通讯作者:
Mootha VK
Mootha VK
中科院分区:
生物学1区
文献类型:
--
作者:
Cracan V;Titov DV;Shen H;Grabarek Z;Mootha VK

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NADH和NADPH是能量代谢、生物合成和解毒广泛需要的氧化还原辅酶。尽管对利用这些辅酶的特定酶和途径有详细的了解,但对NADH和nadph依赖性途径的调控和区隔的整体理解是缺乏的,部分原因是缺乏在活细胞中研究它们的工具。我们之前报道了使用天然存在的短乳杆菌形成NADH氧化酶(LbNOX)作为操纵人类细胞中NAD+/NADH比率的遗传工具。在这里,我们提出TPNOX(三磷酸吡啶核苷酸氧化酶),一个合理设计和工程的LbNOX突变体,严格特异性NADPH。我们描述了TPNOX表达对细胞代谢的影响,并将其与LbNOX结合使用,以显示线粒体NADPH和NADH池的氧化还原状态是如何连接的。
NADH and NADPH are redox coenzymes broadly required for energy metabolism, biosynthesis and detoxification. Despite detailed knowledge of specific enzymes and pathways that utilize these coenzymes, a holistic understanding of the regulation and compartmentalization of NADH and NADPH-dependent pathways is lacking, in part because of a lack of tools with which to investigate them in living cells. We previously reported the use of the naturally occurring Lactobacillus brevis H2O-forming NADH oxidase (LbNOX) as a genetic tool for manipulation of the NAD+/NADH ratio in human cells. Here we present TPNOX (triphosphopyridine nucleotide oxidase), a rationally designed and engineered mutant of LbNOX that is strictly specific towards NADPH. We characterize the effects of TPNOX expression on cellular metabolism and use it in combination with LbNOX to show how the redox states of mitochondrial NADPH and NADH pools are connected.
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