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

The identification of apocytochrome b as a mitochondrial gene product and immunological evidence for altered apocytochrome b in yeast strains having mutations in the COB region of mitochondrial DNA.

The yeast mitochondrial translation product of Mr 30 000 is identical with apocytochrome b. After labelling in vivo with [35S]sulphate in the presence of cycloheximide, the radioactivity in this product present in solubilized submitochondrial particles, was completely recovered in pure cytochrome bc1 complex as a single polypeptide. We show that this translation product is identical with apocytochrome b using peptide mapping by limited proteolysis according to Cleveland et al. [J. Biol. Chem. 250 (1977) 8236-8242] and by immunoprecipitation with a specific antiserum against apocytochrome b. New mitochondrial translation products in 36 strains of Saccharomyces cerevisiae having mutations in the COB region of the mitochondrial DNA, are precipitated by this antiserum. This is consistent with the assumption that many of the cob mutations are localized in the structural gene for apolcytochrome b on mitochondrial DNA. Mutations in two intervening sequences can give rise to products related to apocytochrome b that are considerably longer than normal apocytochrome b. We discuss the hypothesis that in these mutants splicing of the messenger RNA does not occur correctly and that, as a consequence of this, ribosomes read through in an intervening sequence.[1]


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