Biosensor reveals multiple sources for mitochondrial NAD⁺.
Biosensor reveals multiple sources for mitochondrial NAD⁺.
复制标题
DOI:
10.1126/science.aad5168
复制
发表时间:
2016-06-17
期刊:
影响因子:
--
通讯作者:
Goodman RH
中科院分区:
文献类型:
--
作者:
Cambronne XA;Stewart ML;Kim D;Jones-Brunette AM;Morgan RK;Farrens DL;Cohen MS;Goodman RH
Nicotinamide adenine dinucleotide (NAD+) is an essential substrate for sirtuins and ADP-ribose polymerases (PARPs), NAD+-consuming enzymes localized to the nucleus, cytosol, and mitochondria. Fluctuations in NAD+ concentrations within these subcellular compartments are thought to regulate the activity of NAD+-consuming enzymes; however, the challenge in measuring compartmentalized NAD+ in cells has precluded direct evidence for this type of regulation. We describe the generation of a genetically-encoded fluorescent biosensor for directly monitoring free NAD+ concentrations in subcellular compartments. We found that the concentrations of free NAD+ in the nucleus, cytoplasm, and mitochondria approximate the Michaelis constant (Km) for sirtuins and PARPs in their respective compartments. Systematic depletion of enzymes that catalyze the final step of NAD+ biosynthesis revealed cell-specific mechanisms for maintaining mitochondrial NAD+ concentrations.
登录
查看更多内容
影响因子:
4.8
作者:
Palmieri, Ferdinando;Rieder, Benjamin;Neuhaus, H. Ekkehard
通讯作者:
Neuhaus, H. Ekkehard
影响因子:
5.4
作者:
Conforti, Laura;Janeckova, Lucie;Coleman, Michael
通讯作者:
Coleman, Michael
影响因子:
5.7
作者:
Gajiwala, KS;Pinko, C
通讯作者:
Pinko, C
影响因子:
19
作者:
Imai, Shin-ichiro;Guarente, Leonard
通讯作者:
Guarente, Leonard
影响因子:
--
作者:
Tantama, Mathew;Hung, Yin Pun;Yellen, Gary
通讯作者:
Yellen, Gary