Stress-induced phosphorylation and proteasomal degradation of mitofusin 2 facilitates mitochondrial fragmentation and apoptosis.

Stress-induced phosphorylation and proteasomal degradation of mitofusin 2 facilitates mitochondrial fragmentation and apoptosis.
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DOI:
10.1016/j.molcel.2012.05.041
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发表时间:
2012-08-24
期刊:
影响因子:
16
通讯作者:
Weissman, Allan M.
Weissman, Allan M.
中科院分区:
生物学1区
文献类型:
--
作者:
Leboucher, Guillaume P.;Tsai, Yien Che;Yang, Mei;Shaw, Kristin C.;Zhou, Ming;Veenstra, Timothy D.;Glickman, Michael H.;Weissman, Allan M.

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Mitochondria play central roles in integrating pro- and anti-apoptotic stimuli and JNK is well-known to have roles in activating apoptotic pathways. We establish a critical link between stress-induced JNK activation, mitofusin 2, which is an essential component of the mitochondrial outer membrane fusion apparatus, and the ubiquitin-proteasome system (UPS). JNK phosphorylation of mitofusin 2 in response to cellular stress leads to recruitment of the ubiquitin ligase (E3) Huwe1/Mule/ARF-BP1/HectH9/E3Histone/Lasu1 to mitofusin 2, with the BH3 domain of Huwe1 implicated in this interaction. This results in ubiquitin-mediated proteasomal degradation of mitofusin 2, leading to mitochondrial fragmentation and enhanced apoptotic cell death. The stability of a non-phosphorylatable mitofusin 2 mutant is unaffected by stress and protective against apoptosis. Conversely, a mitofusin 2 phosphomimic is more rapidly degraded without cellular stress. These findings demonstrate how proximal signaling events can influence both mitochondrial dynamics and apoptosis through phosphorylation-stimulated degradation of the mitochondrial fusion machinery.
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