Mitochondrial NADP(H) generation is essential for proline biosynthesis.
Mitochondrial NADP(H) generation is essential for proline biosynthesis.
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DOI:
10.1126/science.abd5491
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发表时间:
2021-05-28
期刊:
影响因子:
--
通讯作者:
Thompson CB
中科院分区:
文献类型:
--
作者:
Zhu J;Schwörer S;Berisa M;Kyung YJ;Ryu KW;Yi J;Jiang X;Cross JR;Thompson CB
The coenzyme nicotinamide adenine dinucleotide phosphate (NADP+) and its reduced form (NADPH) regulate reductive metabolism in a subcellularly compartmentalized manner. Mitochondrial NADP(H) production depends on the phosphorylation of NAD(H) by NAD kinase 2 (NADK2). Deletion of NADK2 in human cell lines did not alter mitochondrial folate pathway activity, tricarboxylic acid cycle activity, or mitochondrial oxidative stress, but led to impaired cell proliferation in minimal medium. This growth defect was rescued by proline supplementation. NADK2-mediated mitochondrial NADP(H) generation was required for the reduction of glutamate and hence proline biosynthesis. Furthermore, mitochondrial NADP(H) availability determined the production of collagen proteins by cells of mesenchymal lineage. Thus, a primary function of the mitochondrial NADP(H) pool is to support proline biosynthesis for use in cytosolic protein synthesis. A primary function of NADK2-mediated mitochondrial NADP(H) generation is to support proline production for use in cytosolic protein synthesis.
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