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Title

Identification and metabolic role of the mitochondrial aspartate-glutamate transporter in Saccharomyces cerevisiae

AuthorsCavero, Santiago CSIC ORCID; Arco, Araceli del; Villa, Ana; Cerdán, Sebastián CSIC ORCID; Satrústegui, Jorgina CSIC ORCID
KeywordsUncoupling protein function
Bacterial expression
Functional-characterization
Tissue distribution
Bovine mitochondria
Nadh dehydrogenase
Yeast mitochondria
Amino-acids
C-13 NMR
Carrier
Issue Date2003
PublisherWiley-Blackwell
CitationMolecular Microbiology 150(4): 1257-1269 (2003)
AbstractThe malate-aspartate NADH shuttle in mammalian cells requires the activity of the mitochondrial aspartate-glutamate carrier (AGC). Recently, we identified in man two AGC isoforms, aralar1 and citrin, which are regulated by calcium on the external face of the inner mitochondrial membrane. We have now identified Agc1p as the yeast counterpart of the human AGC. The corresponding gene was overexpressed in bacteria and yeast mitochondria, and the protein was reconstituted in liposomes where it was identified as an aspartate-glutamate transporter from its transport properties. Furthermore, yeast cells lacking Agc1p were unable to grow on acetate and oleic acid, and had reduced levels of valine, ornithine and citrulline; in contrast they grew on ethanol. Expression of the human AGC isoforms can replace the function of Agc1p. However, unlike its human orthologues, yeast Agc1p catalyses both aspartate-glutamate exchange and substrate uniport activities. We conclude that Agc1p performs two metabolic roles in Saccharomyces cerevisiae. On the one hand, it functions as a uniporter to supply the mitochondria with glutamate for nitrogen metabolism and ornithine synthesis. On the other, the Agc1p, as an aspartate-glutamate exchanger, plays a role within the malate-aspartate NADH shuttle which is critical for the growth of yeast on acetate and fatty acids as carbon sources. These results provide strong evidence of the existence of a malate-aspartate NADH shuttle in yeast.
Descriptionet al.
Publisher version (URL)http://dx.doi.org/10.1046/j.1365-2958.2003.03742.x
URIhttp://hdl.handle.net/10261/29624
DOI10.1046/j.1365-2958.2003.03742.x
ISSN0950-382X
Appears in Collections:(IIBM) Artículos
(CBM) Artículos




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