Abstract：
:Ubiquitin and ubiquitin-like chains are finely balanced by conjugating and de-conjugating enzymes. Alterations in this balance trigger the response to stress conditions and are often observed in pathologies. How such changes are detected is not well understood. We identify the HSP70 chaperone as a sensor of changes in the balance between mono- and poly-NEDDylation. Upon DNA damage, the induction of the de-NEDDylating enzyme NEDP1 restricts the formation of NEDD8 chains, mainly through lysines K11/K48. This promotes APAF1 oligomerization and apoptosis induction, a step that requires the HSP70 ATPase activity. HSP70 binds to NEDD8, and, in vitro, the conversion of NEDD8 chains into mono-NEDD8 stimulates HSP70 ATPase activity. This effect is independent of NEDD8 conjugation onto substrates. The study indicates that the NEDD8 cycle is a regulatory module of HSP70 function. These findings may be important in tumorigenesis, as we find decreased NEDP1 levels in hepatocellular carcinoma with concomitant accumulation of NEDD8 conjugates.
journal_name
Cell Repjournal_title
Cell reportsauthors
Bailly AP,Perrin A,Serrano-Macia M,Maghames C,Leidecker O,Trauchessec H,Martinez-Chantar ML,Gartner A,Xirodimas DPdoi
10.1016/j.celrep.2019.08.070subject
Has Abstractpub_date
2019-10-01 00:00:00pages
212-224.e8issue
1issn
2211-1247pii
S2211-1247(19)31125-8journal_volume
29pub_type
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