Identification in Saccharomyces cerevisiae of two isoforms of a novel mitochondrial transporter for 2-oxoadipate and 2-oxoglutarate.

TitleIdentification in Saccharomyces cerevisiae of two isoforms of a novel mitochondrial transporter for 2-oxoadipate and 2-oxoglutarate.
Publication TypeJournal Article
Year of Publication2001
AuthorsPalmieri, L, Agrimi, G, Runswick, MJ, Fearnley, IM, Palmieri, F, Walker, JE
JournalJ Biol Chem
Volume276
Issue3
Pagination1916-22
Date Published2001 Jan 19
ISSN0021-9258
KeywordsAdipates, Carrier Proteins, Ketoglutaric Acids, Mitochondria, Protein Isoforms, Recombinant Proteins, Saccharomyces cerevisiae, Subcellular Fractions
Abstract

The nuclear genome of Saccharomyces cerevisiae encodes 35 members of a family of membrane proteins. Known members transport substrates and products across the inner membranes of mitochondria. We have localized two hitherto unidentified family members, Odc1p and Odc2p, to the inner membranes of mitochondria. They are isoforms with 61% sequence identity, and we have shown in reconstituted liposomes that they transport the oxodicarboxylates 2-oxoadipate and 2-oxoglutarate by a strict counter exchange mechanism. Intraliposomal adipate and glutarate and to a lesser extent malate and citrate supported [14C]oxoglutarate uptake. The expression of Odc1p, the more abundant isoform, made in the presence of nonfermentable carbon sources, is repressed by glucose. The main physiological roles of Odc1p and Odc2p are probably to supply 2-oxoadipate and 2-oxoglutarate from the mitochondrial matrix to the cytosol where they are used in the biosynthesis of lysine and glutamate, respectively, and in lysine catabolism.

DOI10.1074/jbc.M004332200
Alternate JournalJ. Biol. Chem.
Citation Key10.1074/jbc.M004332200
PubMed ID11013234