BAG6/BAT3 modulates autophagy by affecting EP300/p300 intracellular localization
Résumé
We recently reported that BAG6/BAT3 (BCL2-associated athanogene 6) is essential for basal and starvation-induced autophagy in E18.5 bag6(-/-) mouse embryos and in mouse embryonic fibroblasts (MEFs) through the modulation of the EP300/p300-dependent acetylation of TRP53 and autophagy-related (ATG) proteins. We observed that BAG6 increases TRP53 acetylation during starvation and pro-autophagic TRP53-target gene expression. BAG6 also decreases the EP300 dependent-acetylation of ATG5, ATG7, and LC3-I, posttranslational modifications that inhibit autophagy. In addition, in the absence of BAG6 or when using a mutant of BAG6 exclusively located in the cytoplasm, autophagy is inhibited, ATG7 is hyperacetylated, TRP53 acetylation is abrogated, and EP300 accumulates in the cytoplasm indicating that BAG6 is involved in the regulation of the nuclear localization of EP300. We also reported that the interaction between BAG6 and EP300 occurs in the cytoplasm rather than the nucleus. Moreover, during starvation, EP300 is transported to the nucleus in a BAG6-dependent manner. We concluded that BAG6 regulates autophagy by controlling the localization of EP300 and its accessibility to nuclear (TRP53) and cytoplasmic (ATGs) substrates.
Mots clés
*Autophagy
acetylation
Intracellular Space/*metabolism
Molecular Chaperones/*metabolism
Intracellular Space
ATG
autophagy
Animals
Protein Transport
Models
Biological
Mice
Nuclear Proteins
BAT3
Molecular Chaperones
E1A-Associated p300 Protein
E1A-Associated p300 Protein/*metabolism
Tumor Suppressor Protein p53
Nuclear Proteins/*metabolism
nucleocytoplasmic shuttling
p53
Tumor Suppressor Protein p53/metabolism