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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Structure-function studies of adenine nucleotide transport in mitochondria. II. Biochemical analysis of distinct AAC1 and AAC2 proteins in yeast.

AAC1 and AAC2 genes in yeast each encode functional ADP/ATP carrier (AAC) proteins of the mitochondrial inner membrane. In the present study, mitochondria harboring distinct AAC proteins and the pet9 Arg96 to HIS mutant (Lawson, J., Gawaz, M., Klingenberg, M., and Douglas, M. G. (1990) J. Biol. Chem. 265, 14195-14201) protein have been characterized. In addition, properties of the different AAC proteins have been defined following reconstitution into proteoliposomes. Deletion of AAC2 but not AAC1 causes a major reduction in the mitochondrial cytochrome content and respiration, and this level remains low even when the level of AAC1 protein is increased to 20% that of the AAC2 gene product. In reconstitution studies, the rate of nucleotide transport by isolated AAC1 protein is approximately 40% that of the AAC2 protein. Thus, the lack of mitochondrial-dependent growth supported by the AAC1 gene product alone may be due to the combination of low abundance and reduced activity. Surprisingly, analysis of the Arg96 to His mutant protein revealed binding and transport activities similar to the functional AAC1 and AAC2 gene products. These observations are discussed in relation to a molecular analysis of this highly conserved small transporter and its function in conjunction with other proteins in the mitochondrial membrane.[1]


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