SLC25A51 is a mammalian mitochondrial NAD(+) transporter.

SLC25A51 is a mammalian mitochondrial NAD(+) transporter.
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SLC25A51 是一种哺乳动物线粒体 NAD(+) 转运蛋白。

DOI:
10.1038/s41586-020-2741-7
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发表时间:
2020-12
期刊:
影响因子:
64.8
通讯作者:
Baur JA
Baur JA
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Luongo TS;Eller JM;Lu MJ;Niere M;Raith F;Perry C;Bornstein MR;Oliphint P;Wang L;McReynolds MR;Migaud ME;Rabinowitz JD;Johnson FB;Johnsson K;Ziegler M;Cambronne XA;Baur JA

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线粒体需要烟酰胺腺嘌呤二核苷酸 (NAD+) 来执行促进呼吸和介导细胞能量转导的基本过程。线粒体 NAD+ 转运蛋白已在酵母和植物中被发现,但它们在哺乳动物中的存在存在争议。在这里,我们证明哺乳动物线粒体能够吸收完整的 NAD+ 并将 SLC25A51(一种以前未知功能的重要线粒体蛋白,也称为 MCART1)识别为哺乳动物线粒体 NAD+ 转运蛋白。 SLC25A51 的缺失会降低线粒体而非全细胞 NAD+ 含量,损害线粒体呼吸,并阻止 NAD+ 摄取到分离的线粒体中。相反,SLC25A51 或几乎相同的旁系同源物 SLC25A52 的过表达会增加线粒体 NAD+ 水平,并恢复缺乏内源 NAD+ 转运蛋白的酵母线粒体对 NAD+ 的摄取。总之,这些发现确定 SLC25A51 是第一个能够将 NAD+ 导入哺乳动物线粒体的转运蛋白。
Mitochondria require nicotinamide adenine dinucleotide (NAD+) in order to carry out the fundamental processes that fuel respiration and mediate cellular energy transduction. Mitochondrial NAD+ transporters have been identified in yeast and plants but their very existence is controversial in mammals . Here we demonstrate that mammalian mitochondria are capable of taking up intact NAD+ and identify SLC25A51 (an essential mitochondrial protein of previously unknown function, also known as MCART1) as a mammalian mitochondrial NAD+ transporter. Loss of SLC25A51 decreases mitochondrial but not whole-cell NAD+ content, impairs mitochondrial respiration, and blocks the uptake of NAD+ into isolated mitochondria. Conversely, overexpression of SLC25A51 or a nearly identical paralog, SLC25A52, increases mitochondrial NAD+ levels and restores NAD+ uptake into yeast mitochondria lacking endogenous NAD+ transporters. Together, these findings identify SLC25A51 as the first transporter capable of importing NAD+ into mammalian mitochondria.
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