PINK1 disables the anti-fission machinery to segregate damaged mitochondria for mitophagy.

PINK1 disables the anti-fission machinery to segregate damaged mitochondria for mitophagy.
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DOI:
10.1083/jcb.201509003
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发表时间:
2016-04-25
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Schapira AH
Schapira AH
中科院分区:
其他
文献类型:
--
作者:
Pryde KR;Smith HL;Chau KY;Schapira AH

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除了将Parkin/自噬受体招募到受损的线粒体外,作者还发现PINK1以一种与Parkin无关的方式触发AKAP1损伤后的PKA位移,从而触发线粒体分裂,这表明PINK1是一个主要的线粒体自噬调节因子。线粒体分裂对受损线粒体的降解至关重要。目前尚不清楚动力蛋白相关蛋白1 (DRP1)相关的裂变机制是如何选择性地靶向分离受损线粒体的。我们发现pten诱导的推定激酶(PINK1)作为一个独立于Parkin的促裂变信号。正常情况下,支架蛋白AKAP1将蛋白激酶A (PKA)招募到线粒体外膜以磷酸化抑制DRP1。我们发现损伤后,PINK1触发a激酶锚定蛋白1的PKA位移。通过释放PKA, PINK1确保受损线粒体进行细胞器降解所必需的裂变。我们提出PINK1通过激活Parkin和DRP1来响应损伤,从而作为线粒体自噬的主要调节因子发挥作用。我们证实,引起帕金森病的PINK1突变干扰了PINK1对选择性裂变和有丝自噬的协调。
In addition to recruiting Parkin/autophagy receptors to damaged mitochondria, the authors show that PINK1 triggers PKA displacement from AKAP1 after damage to trigger mitochondrial fission in a Parkin-independent manner, suggesting that PINK1 is a master mitophagy regulator. Mitochondrial fission is essential for the degradation of damaged mitochondria. It is currently unknown how the dynamin-related protein 1 (DRP1)–associated fission machinery is selectively targeted to segregate damaged mitochondria. We show that PTEN-induced putative kinase (PINK1) serves as a pro-fission signal, independently of Parkin. Normally, the scaffold protein AKAP1 recruits protein kinase A (PKA) to the outer mitochondrial membrane to phospho-inhibit DRP1. We reveal that after damage, PINK1 triggers PKA displacement from A-kinase anchoring protein 1. By ejecting PKA, PINK1 ensures the requisite fission of damaged mitochondria for organelle degradation. We propose that PINK1 functions as a master mitophagy regulator by activating Parkin and DRP1 in response to damage. We confirm that PINK1 mutations causing Parkinson disease interfere with the orchestration of selective fission and mitophagy by PINK1.
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