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Identification and characterization of a novel mitochondrial tricarboxylate carrier
Shin-ichi Miyake1, Toshihide Yamashita, Manabu Taniguchi
1Department of Anatomy and Neuroscience, Graduate School of Medicine, Osaka University, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan.
Abstract:
Here we report the identification and functional characterization of a novel mitochondrial tricarboxylate carrier protein, designated BBG-TCC, in rat brain. The cDNA encodes the predicted protein of 342-amino acid residues with five putative membrane-spanning domains. The protein has apparent similarity with a mitochondrial tricarboxylate carrier TCC, but is distinct from the other mitochondria anion transporters. BBG-TCC shows a citrate transport activity. It is specifically expressed in the brain and localizes in the mitochondria of Bergmann glial cells. In contrast, the expression of TCC is rather ubiquitous and strong in neuronal cells in the brain. This new family of proteins may contribute to biosynthesis and bioenergetics in the brain.