Mitochondrial translocation of APE1 relies on the MIA pathway.

Mitochondrial translocation of APE1 relies on the MIA pathway.
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DOI:
10.1093/nar/gkv433
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发表时间:
2015-06-23
影响因子:
14.9
通讯作者:
Vascotto C
Vascotto C
中科院分区:
生物学2区
文献类型:
--
作者:
Barchiesi A;Wasilewski M;Chacinska A;Tell G;Vascotto C

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APE1 是一种多功能蛋白,在修复由氧化剂和烷化剂引起的核和线粒体 DNA 损伤中发挥着重要作用。不幸的是,对调节 APE1 细胞内运输的机制的理解仍然不完整且相互矛盾。最近的数据表明,APE1 与线粒体输入和组装蛋白 Mia40 相互作用,表明依赖于二硫键转移系统的氧化还原辅助机制参与了 APE1 转运至线粒体的过程。 MIA 途径是一种重要机制,它使用富含半胱氨酸的蛋白质的氧化还原系统来驱动它们进入该区室。它由两种主要蛋白质组成:Mia40是氧化还原酶,催化底物中二硫键的形成,而ALR在导入后重新氧化Mia40。在这项研究中,我们证明:(i)APE1 和 Mia40 通过二硫键形成相互作用; (ii) Mia40 表达水平直接影响 APE1 的线粒体易位,因此在维持线粒体 DNA 完整性中发挥作用。总之,我们的数据强烈支持依赖于 Mia40 的氧化还原辅助机制控制 APE1 易位到线粒体内膜空间的假设,从而强调了这种蛋白质转运途径在维持线粒体 DNA 稳定性和细胞存活中的作用。
APE1 is a multifunctional protein with a fundamental role in repairing nuclear and mitochondrial DNA lesions caused by oxidative and alkylating agents. Unfortunately, comprehensions of the mechanisms regulating APE1 intracellular trafficking are still fragmentary and contrasting. Recent data demonstrate that APE1 interacts with the mitochondrial import and assembly protein Mia40 suggesting the involvement of a redox-assisted mechanism, dependent on the disulfide transfer system, to be responsible of APE1 trafficking into the mitochondria. The MIA pathway is an import machinery that uses a redox system for cysteine enriched proteins to drive them in this compartment. It is composed by two main proteins: Mia40 is the oxidoreductase that catalyzes the formation of the disulfide bonds in the substrate, while ALR reoxidizes Mia40 after the import. In this study, we demonstrated that: (i) APE1 and Mia40 interact through disulfide bond formation; and (ii) Mia40 expression levels directly affect APE1's mitochondrial translocation and, consequently, play a role in the maintenance of mitochondrial DNA integrity. In summary, our data strongly support the hypothesis of a redox-assisted mechanism, dependent on Mia40, in controlling APE1 translocation into the mitochondrial inner membrane space and thus highlight the role of this protein transport pathway in the maintenance of mitochondrial DNA stability and cell survival.
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