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Sue1p Is Required for Degradation of Labile Forms of Altered Cytochromes c in Yeast Mitochondria.
- Source :
-
Journal of Biological Chemistry . 7/16/2004, Vol. 279 Issue 29, p30449-30458. 10p. 6 Diagrams, 6 Charts, 2 Graphs. - Publication Year :
- 2004
-
Abstract
- Previous studies on certain altered holo-isocytochromes c revealed a ρ--dependent degradation (RDD) phenotype, in which certain altered holo-iso-1-cytochromes c are at normal or nearly normal levels in ρ+ strains, but are at low levels or absent in ρ- strains, although wild-type holo-iso-1-cytochrome c is present at normal levels in both ρ+ and related ρ- 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 ρ- sue1 strains. Also, ρ+ sue1 strains containing certain altered holo-iso-1-cytochromes c grew better on non-fermentable carbon sources than the corresponding ρ+ 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00219258
- Volume :
- 279
- Issue :
- 29
- Database :
- Academic Search Index
- Journal :
- Journal of Biological Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 14170648
- Full Text :
- https://doi.org/10.1074/jbc.M403742200