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Journal of Cell Science, Vol 112, Issue 22 4079-4087, Copyright © 1999 by Company of Biologists
JOURNAL ARTICLES |
MU Hutchins, M Veenhuis and DJ Klionsky
University of California, Davis, Section of Microbiology, Davis, CA 95616, USA.
Organelle biogenesis and turnover are necessary to maintain biochemical processes that are appropriate to the needs of the eukaryotic cell. Specific degradation of organelles in response to changing environmental cues is one aspect of achieving proper metabolic function. For example, the yeast Saccharomyces cerevisiae adjusts the level of peroxisomes in response to differing nutritional sources. When cells are grown on oleic acid as the sole carbon source, peroxisome biogenesis is induced. Conversely, a subsequent shift to glucose-rich or nitrogen-limiting conditions results in peroxisome degradation. The degradation process, pexophagy, requires the activity of vacuolar hydrolases. In addition, peroxisome degradation is specific. Analyses of cellular marker proteins indicate that peroxisome degradation under these conditions occurs more rapidly and to a greater extent than mitochondrial, Golgi, or cytosolic protein delivery to the vacuole by the non-selective autophagy pathway. To elucidate the molecular mechanism of selective peroxisome degradation, we examined pexophagy in mutants that are defective in autophagy (apg) and the selective targeting of aminopeptidase I to the vacuole by the cytoplasm to vacuole targeting (Cvt) pathway. Inhibition of peroxisome degradation in cvt and apg mutants indicates that these pathways overlap and that peroxisomes are delivered to the vacuole by a mechanism that utilizes protein components of the Cvt/autophagy pathways.
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