Cdc48 and Ufd3, new partners of the ubiquitin protease Ubp3, are required for ribophagy.

ABSTRACT: Ubiquitin-dependent processes can be antagonized by substrate-specific deubiquitination enzymes involved in many cellular functions. In this study, we show that the yeast Ubp3-Bre5 deubiquitination complex interacts with both the chaperone-like Cdc48, a major actor of the ubiquitin and proteasome system, and Ufd3, a ubiquitin-binding cofactor of Cdc48. We observed that these partners are required for the Ubp3-Bre5-dependent and starvation-induced selective degradation of yeast mature ribosomes, also called ribophagy. By contrast, proteasome-dependent degradation does not participate in this process. Our data favour the idea that these factors cooperate to recognize and deubiquitinate specific substrates of ribophagy before their vacuolar degradation.

SUBMITTER: Ossareh-Nazari B 

PROVIDER: S-EPMC2897114 | biostudies-other | 2010 Jul

REPOSITORIES: biostudies-other