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. 1990 Sep;87(18):7185–7189. doi: 10.1073/pnas.87.18.7185

High-affinity transport of glutathione is part of a multicomponent system essential for mitochondrial function.

J Mårtensson 1, J C Lai 1, A Meister 1
PMCID: PMC54708  PMID: 2402500

Abstract

Glutathione, an essential cellular antioxidant required for mitochondrial function, is not synthesized by mitochondria but is imported from the cytosol. Rat liver mitochondria have a multicomponent system that underlies the remarkable ability of mitochondria to take up and retain glutathione. At external glutathione levels of less than 1 mM, glutathione is transported into the mitochondrial matrix by a high-affinity component (Km, approximately 60 microM; V max, approximately 0.5 nmol/min per mg of protein), which is saturated at levels of 1-2 mM and stimulated by ATP. Another component has lower affinity (Km, approximately 5.4 mM; Vmax, approximately 5.9 nmol/min per mg of protein) and is stimulated by ATP and ADP. Both components are inhibited by carbonylcyanide p-(trifluoromethoxy)phenylhydrazone (FCCP), glutamate, and ophthalmic acid. Increase of extramitochondrial glutathione promotes uptake and exchange; the intermembranous space seems to function as a recovery zone that promotes efficient recycling of matrix glutathione. The findings are in accord with in vivo data showing that (i) rapid exchange occurs between mitochondrial and cytosolic glutathione, (ii) lowering of cytosolic glutathione levels (produced by administration of buthionine sulfoximine) decreases export of glutathione from mitochondria to cytosol, and (iii) administration of glutathione esters increases glutathione levels in mitochondria more than those in the cytosol.

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Selected References

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