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Identification of the yeast ARG-11 gene as a mitochondrial ornithine carrier involved in arginine biosynthesis.

The ARG-11 gene in Saccharomyces cerevisiae encodes a protein with the characteristic features of a family of 35 related membrane proteins that are encoded in the fungal genome. Some of them are known to transport various substrates and products across the inner membranes of mitochondria, but the functions of 29 members of the family are unknown. The yeast ARG-11 protein has been over-produced as inclusion bodies in Escherichia coli. It has been solubilized in the presence of sarkosyl, re-constituted into liposomes and shown to transport ornithine in exchange for protons. Its main physiological role is probably to take ornithine synthesized from glutamate in the mitochondrial matrix to the cytosol where it is converted to arginine.[1]

References

  1. Identification of the yeast ARG-11 gene as a mitochondrial ornithine carrier involved in arginine biosynthesis. Palmieri, L., De Marco, V., Iacobazzi, V., Palmieri, F., Runswick, M.J., Walker, J.E. FEBS Lett. (1997) [Pubmed]
 
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