ATG12 conjugation to ATG3 regulates mitochondrial homeostasis and cell death.

ATG12 conjugation to ATG3 regulates mitochondrial homeostasis and cell death.
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DOI:
10.1016/j.cell.2010.07.018
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发表时间:
2010-08-20
期刊:
影响因子:
64.5
通讯作者:
Debnath J
Debnath J
中科院分区:
生物学1区
文献类型:
--
作者:
Radoshevich L;Murrow L;Chen N;Fernandez E;Roy S;Fung C;Debnath J

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ATG 12是一种大自噬所需的泛素样修饰剂,具有一个已知的结合靶点,另一种称为ATG 5的自噬调节剂。在这里,我们确定ATG 3作为ATG 12缀合的底物。ATG 3是自噬过程中ATG 8/LC 3脂化所必需的E2样酶。ATG 12-ATG 3复合物的形成需要ATG 7作为E1酶和ATG 3作为E2的自催化活性,导致ATG 12共价连接到ATG 3上的单个赖氨酸上。令人惊讶的是,破坏ATG 12与ATG 3的缀合不影响饥饿诱导的自噬。相反,ATG 12-ATG 3复合物形成的缺乏导致线粒体质量的扩增并抑制由线粒体途径介导的细胞死亡。总的来说,这些结果揭示了ATG 12-ATG 3在线粒体稳态中的作用,并暗示了ATG 12缀合系统在细胞功能中不同于自噬体形成的早期步骤。
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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