Autophagy maintains cellular homeostasis by degrading harmful or unnecessary intracellular components. How the autophagy response is induced rapidly and transiently remains largely unknown. We report that the E3 ubiquitin ligases Cullin-5 and Cullin-4 regulate the onset and termination of autophagy, respectively, by dynamically interacting with AMBRA1, a regulator of autophagy. Under normal conditions, Cullin-4 binding to AMBRA1 limits its protein abundance. Autophagy stimuli promote AMBRA1 stabilization by causing ULK1-dependent Cullin-4 release. Notably, Cullin-4/AMBRA1 dissociation is transient, and the re-established interaction triggers AMBRA1 degradation, terminating the autophagy response. Moreover, Cullin-4 inhibits the interaction between AMBRA1 and another Cullin E3 ligase. Indeed, upon Cullin-4 dissociation, AMBRA1 binds and inhibits Cullin-5, thus promoting the accumulation of the mTOR inhibitor DEPTOR. Through DEPTOR stabilization, AMBRA1 establishes a feedback loop that ensures the rapid onset of autophagy by enhancing mTOR inactivation. Our findings show that Cullin-mediated degradation of autophagy regulators temporally controls the autophagy response.

Antonioli, M., Albiero, A., Nazio, F., Vescovo, T., Corazzari, M., Marsella, L.t., et al. (2014). AMBRA1 interplay with cullin E3 Ubiquitin ligases regulates autophagy dynamics. DEVELOPMENTAL CELL, 31(6), 734-746 [10.1016/j.devcel.2014.11.013].

AMBRA1 interplay with cullin E3 Ubiquitin ligases regulates autophagy dynamics

ANTONIOLI, MANUELA;ALBIERO, ALESSANDRA;NAZIO, FRANCESCA;CORAZZARI, MARCO;MARSELLA, LUIGI TONINO;CECCONI, FRANCESCO;PIACENTINI, MAURO;Perdomo, A
2014-01-01

Abstract

Autophagy maintains cellular homeostasis by degrading harmful or unnecessary intracellular components. How the autophagy response is induced rapidly and transiently remains largely unknown. We report that the E3 ubiquitin ligases Cullin-5 and Cullin-4 regulate the onset and termination of autophagy, respectively, by dynamically interacting with AMBRA1, a regulator of autophagy. Under normal conditions, Cullin-4 binding to AMBRA1 limits its protein abundance. Autophagy stimuli promote AMBRA1 stabilization by causing ULK1-dependent Cullin-4 release. Notably, Cullin-4/AMBRA1 dissociation is transient, and the re-established interaction triggers AMBRA1 degradation, terminating the autophagy response. Moreover, Cullin-4 inhibits the interaction between AMBRA1 and another Cullin E3 ligase. Indeed, upon Cullin-4 dissociation, AMBRA1 binds and inhibits Cullin-5, thus promoting the accumulation of the mTOR inhibitor DEPTOR. Through DEPTOR stabilization, AMBRA1 establishes a feedback loop that ensures the rapid onset of autophagy by enhancing mTOR inactivation. Our findings show that Cullin-mediated degradation of autophagy regulators temporally controls the autophagy response.
2014
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore BIO/06 - ANATOMIA COMPARATA E CITOLOGIA
English
Con Impact Factor ISI
Adaptor Proteins, Signal Transducing; Animals; Cell Death; Cullin Proteins; Fibroblasts; HEK293 Cells; Humans; Mice; TOR Serine-Threonine Kinases; Ubiquitin; Ubiquitin-Protein Ligases; Autophagy; Gene Expression Regulation, Developmental
Antonioli, M., Albiero, A., Nazio, F., Vescovo, T., Corazzari, M., Marsella, L.t., et al. (2014). AMBRA1 interplay with cullin E3 Ubiquitin ligases regulates autophagy dynamics. DEVELOPMENTAL CELL, 31(6), 734-746 [10.1016/j.devcel.2014.11.013].
Antonioli, M; Albiero, A; Nazio, F; Vescovo, T; Corazzari, M; Marsella, Lt; Piselli, P; Gretzmeier, C; Dengjel, J; Cecconi, F; Piacentini, M; Fimia, G...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/120367
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