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Calcium uptake mechanisms of mitochondria

Santo-Domingo, Jaime
Published in Biochimica et Biophysica Acta. 2010, vol. 1797, no. 6-7, p. 907-912
Abstract The ability of mitochondria to capture Ca2+ ions has important functional implications for cells, because mitochondria shape cellular Ca2+ signals by acting as a Ca2+ buffer and respond to Ca2+ elevations either by increasing the cell energy supply or by triggering the cell death program of apoptosis. A mitochondrial Ca2+ channel known as the uniporter drives the rapid and massive entry of Ca2+ ions into mitochondria. The uniporter operates at high, micromolar cytosolic Ca2+ concentrations that are only reached transiently in cells, near Ca2+ release channels. Mitochondria can also take up Ca2+ at low, nanomolar concentrations, but this high affinity mode of Ca2+ uptake is not well characterized. Recently, leucine-zipper-EF hand-containing transmembrane region (Letm1) was proposed to be an electrogenic 1:1 mitochondrial Ca2+/H+ antiporter that drives the uptake of Ca2+ into mitochondria at nanomolar cytosolic Ca2+ concentrations. In this article, we will review the properties of the Ca2+ import systems of mitochondria and discuss how Ca2+ uptake via an electrogenic 1:1 Ca2+/H+ antiport challenges our current thinking of the mitochondrial Ca2+ uptake mechanism.
Keywords AnimalsAntiporters/metabolismCalcium/*metabolismCalcium Channels/metabolismCalcium SignalingCalcium-Binding Proteins/metabolismCation Transport Proteins/metabolismHumansIon TransportMembrane Proteins/metabolismMitochondria/*metabolismModels, Biological
PMID: 20079335
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Research group Signaux intracellulaires (210)
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SANTO-DOMINGO, Jaime, DEMAUREX, Nicolas. Calcium uptake mechanisms of mitochondria. In: Biochimica et Biophysica Acta, 2010, vol. 1797, n° 6-7, p. 907-912. https://archive-ouverte.unige.ch/unige:21286

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Deposited on : 2012-05-23

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