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The Rsp5 ubiquitin ligase and the AAA-ATPase Cdc48 control the ubiquitin-mediated degradation of the COPII component Sec23
Authors:Batool Ossareh-Nazari
Institution:
  • Institut Jacques Monod, Université Paris VII, CNRS, Bâtiment Buffon, 15 rue Hélène Brion, 75205 Paris Cedex 13, France
  • Abstract:Ubp3/Bre5 complex is a substrate-specific deubiquitylating enzyme which mediates deubiquitylation of Sec23, a component of the COPII complex involved in the transport between endoplasmic reticulum and Golgi apparatus 1]. Here we show that ubiquitylation of Sec23 is controlled by the Rsp5 ubiquitin ligase both in vivo and in vitro. We have recently identified Cdc48, a chaperone-like that plays a key role in the proteasomal escort pathway, as a partner of the Ubp3/Bre5 complex 2]. We now found that cdc48 thermosensitive mutant cells not only accumulate ubiquitylated form of Sec23 but also display a stabilization of this protein at the restrictive temperature. This indicates that Cdc48 controls the proteasome-mediated degradation of Sec23. Our data favor the idea that Cdc48 plays a key role in deciphering fates of ubiquitylated Sec23 to degradation or deubiquitylation/stabilization via its cofactors.
    Keywords:Sec23  Ubiquitylation  Deubiquitylation  Stability  Rsp5  Cdc48
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