Cyclic AMP produced inside mitochondria regulates oxidative phosphorylation.
Cyclic AMP produced inside mitochondria regulates oxidative phosphorylation.
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DOI:
10.1016/j.cmet.2009.01.012
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发表时间:
2009-03
期刊:
影响因子:
29
通讯作者:
Manfredi G
中科院分区:
文献类型:
--
作者:
Acin-Perez R;Salazar E;Kamenetsky M;Buck J;Levin LR;Manfredi G
Mitochondria constantly respond to changes in substrate availability and energy utilization to maintain cellular ATP supplies, and at the same time control reactive oxygen radical (ROS) production. Reversible phosphorylation of mitochondrial proteins has been proposed to play a fundamental role in metabolic homeostasis, but very little is known about the signalling pathways involved. We show here that Protein Kinase A (PKA) regulates ATP production by phosphorylation of mitochondrial proteins, including subunits of cytochrome c oxidase. The cyclic AMP (cAMP) which activates mitochondrial PKA does not originate from cytoplasmic sources but is generated within mitochondria by the carbon dioxide/bicarbonate-regulated soluble adenylyl cyclase (sAC) in response to metabolically generated carbon dioxide. We demonstrate for the first time the existence of a CO2-HCO3−-sAC-cAMP-PKA (mito-sAC) signalling cascade wholly contained within mitochondria, which serves as a metabolic sensor modulating ATP generation and ROS production in response to nutrient availability.
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影响因子:
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通讯作者:
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