Absolute Quantification of Matrix Metabolites Reveals the Dynamics of Mitochondrial Metabolism.
Absolute Quantification of Matrix Metabolites Reveals the Dynamics of Mitochondrial Metabolism.
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基质代谢物的绝对定量揭示了线粒体代谢的动态。
DOI:
10.1016/j.cell.2016.07.040
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发表时间:
2016-08-25
期刊:
影响因子:
64.5
通讯作者:
Sabatini, David M.
中科院分区:
文献类型:
--
作者:
Chen, Walter W.;Freinkman, Elizaveta;Wang, Tim;Birsoy, Kivanc;Sabatini, David M.
Mitochondria house metabolic pathways that impact most aspects of cellular physiology. While metabolite profiling by mass spectrometry is widely applied at the whole-cell level, it is not routinely possible to measure the concentrations of small molecules in mammalian organelles. We describe a method for the rapid and specific isolation of mitochondria, which we use in tandem with a database of predicted mitochondrial metabolites (“MITObolome”) to measure the matrix concentrations of greater than 100 metabolites across various states of respiratory chain (RC) function. Disruption of the RC revealed extensive compartmentalization of mitochondrial metabolism and signatures unique to the inhibition of each RC complex. Pyruvate enables the proliferation of RC-deficient cells, but had surprisingly limited effects on matrix contents. Interestingly, despite failing to restore matrix NADH/NAD balance, pyruvate did increase aspartate, likely through the exchange of matrix glutamate for cytosolic aspartate. We demonstrate the value of mitochondrial metabolite profiling and describe a strategy applicable to other organelles. Metabolite profiling of intact mammalian mitochondria captures dynamics of mitochondrial metabolism not revealed by whole cell analysis.
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