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Letter

Nature Cell Biology 10, 602–610 (1 May 2008) | doi:10.1038/ncb1723

Mature ribosomes are selectively degraded upon starvation by an autophagy pathway requiring the Ubp3p/Bre5p ubiquitin protease

Claudine Kraft , Anna Deplazes , Marc Sohrmann & Matthias Peter

Eukaryotic cells use autophagy and the ubiquitin–proteasome system (UPS) as their major protein degradation pathways. Whereas the UPS is required for the rapid degradation of proteins when fast adaptation is needed, autophagy pathways selectively remove protein aggregates and damaged or excess organelles.