Journal
CELL
Volume 142, Issue 4, Pages 590-600Publisher
CELL PRESS
DOI: 10.1016/j.cell.2010.07.018
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Funding
- NIH [RO1CA126792, KO8CA098419]
- Culpeper Medical Scholar Award
- AACR-Genentech BioOncology Award
- HHMI Physician-Scientist Early Career Award
- Stewart Family Trust Award
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ATG12, an ubiquitin-like modifier required for macroautophagy, has a single known conjugation target, another autophagy regulator called ATG5. Here, we identify ATG3 as a substrate for ATG12 conjugation. ATG3 is the E2-like enzyme necessary for ATG8/LC3 lipidation during autophagy. ATG12-ATG3 complex formation requires ATG7 as the E1 enzyme and ATG3 autocatalytic activity as the E2, resulting in the covalent linkage of ATG12 onto a single lysine on ATG3. Surprisingly, disrupting ATG12 conjugation to ATG3 does not affect starvation-induced autophagy. Rather, the lack of ATG12-ATG3 complex formation produces an expansion in mitochondrial mass and inhibits cell death mediated by mitochondrial pathways. Overall, these results unveil a role for ATG12-ATG3 in mitochondrial homeostasis and implicate the ATG12 conjugation system in cellular functions distinct from the early steps of autophagosome formation.
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