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Mitochondrial Carriers for Aspartate, Glutamate and Other Amino Acids: A Review
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Mitochondrial Carriers for Aspartate, Glutamate and Other Amino Acids: A Review
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Journal Article
Mitochondrial Carriers for Aspartate, Glutamate and Other Amino Acids: A Review
2019
Overview
Members of the mitochondrial carrier (MC) protein family transport various molecules across the mitochondrial inner membrane to interlink steps of metabolic pathways and biochemical processes that take place in different compartments; i.e., are localized partly inside and outside the mitochondrial matrix. MC substrates consist of metabolites, inorganic anions (such as phosphate and sulfate), nucleotides, cofactors and amino acids. These compounds have been identified by in vitro transport assays based on the uptake of radioactively labeled substrates into liposomes reconstituted with recombinant purified MCs. By using this approach, 18 human, plant and yeast MCs for amino acids have been characterized and shown to transport aspartate, glutamate, ornithine, arginine, lysine, histidine, citrulline and glycine with varying substrate specificities, kinetics, influences of the pH gradient, and capacities for the antiport and uniport mode of transport. Aside from providing amino acids for mitochondrial translation, the transport reactions catalyzed by these MCs are crucial in energy, nitrogen, nucleotide and amino acid metabolism. In this review we dissect the transport properties, phylogeny, regulation and expression levels in different tissues of MCs for amino acids, and summarize the main structural aspects known until now about MCs. The effects of their disease-causing mutations and manipulation of their expression levels in cells are also considered as clues for understanding their physiological functions.
Publisher
MDPI AG,MDPI
Subject
/ Arabidopsis Proteins - classification
/ Arabidopsis Proteins - genetics
/ Arabidopsis Proteins - metabolism
/ Humans
/ Mitochondrial Membrane Transport Proteins - classification
/ Mitochondrial Membrane Transport Proteins - genetics
/ Mitochondrial Membrane Transport Proteins - metabolism
/ Mitochondrial Membranes - metabolism
/ Proteins
/ Review
/ Saccharomyces cerevisiae Proteins - classification
/ Saccharomyces cerevisiae Proteins - genetics
/ Saccharomyces cerevisiae Proteins - metabolism
/ Yeast
