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Deprecated: Implicit conversion from float 213.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Am+J+Physiol+Cell+Physiol 2016 ; 311 (1): C67-80 Nephropedia Template TP
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The mitochondrial Ca2+ uniporter: regulation by auxiliary subunits and signal transduction pathways #MMPMID27122161
Am J Physiol Cell Physiol 2016[Jul]; 311 (1): C67-80 PMID27122161show ga
Mitochondrial Ca2+ homeostasis, the Ca2+ influx-efflux balance, is responsible for the control of numerous cellular functions, including energy metabolism, generation of reactive oxygen species, spatiotemporal dynamics of Ca2+ signaling, and cell growth and death. Recent discovery of the molecular identity of the mitochondrial Ca2+ uniporter (MCU) provides new possibilities for application of genetic approaches to study the mitochondrial Ca2+ influx mechanism in various cell types and tissues. In addition, the subsequent discovery of various auxiliary subunits associated with MCU suggests that mitochondrial Ca2+ uptake is not solely regulated by a single protein (MCU), but likely by a macromolecular protein complex, referred to as the MCU-protein complex (mtCUC). Moreover, recent reports have shown the potential role of MCU posttranslational modifications in the regulation of mitochondrial Ca2+ uptake through mtCUC. These observations indicate that mtCUCs form a local signaling complex at the inner mitochondrial membrane that could significantly regulate mitochondrial Ca2+ handling, as well as numerous mitochondrial and cellular functions. In this review we discuss the current literature on mitochondrial Ca2+ uptake mechanisms, with a particular focus on the structure and function of mtCUC, as well as its regulation by signal transduction pathways, highlighting current controversies and discrepancies.