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Reference: Wei J and Sherman F (2004) Sue1p is required for degradation of labile forms of altered cytochromes C in yeast mitochondria. J Biol Chem 279(29):30449-58

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Abstract


Previous studies on certain altered holo-isocytochromes c revealed a rho(-)-dependent degradation (RDD) phenotype, in which certain altered holo-iso-1-cytochromes c are at normal or nearly normal levels in rho+ strains, but are at low levels or absent in rho- strains, although wild-type holo-iso-1-cytochrome c is present at normal levels in both rho+ and related rho- strains. The diminished levels of altered holo-iso-1-cytochrome c are due to the rapid degradation that is carried out by a novel proteolytic pathway in the IMS of mitochondria. SUE1, a nuclear gene that encodes a mitochondrial protein, was identified with a genetic screen for mutants that diminish RDD. The levels of RDD and certain other types of altered holo-iso-1-cytochrome c were elevated in rho- sue1 strains. Also, rho+ sue1 strains containing certain altered holo-iso-1-cytochromes c grew better on non-fermentable carbon sources than the corresponding rho+ SUE1 strains. These results indicate that Sue1p may play an important role in the degradation of abnormal holo-iso-1-cytochrome c in the mitochondria.

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Journal Article
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Wei J, Sherman F
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