BNIP3 and NIX mediate Mieap-induced accumulation of lysosomal proteins within mitochondria.

BNIP3 and NIX mediate Mieap-induced accumulation of lysosomal proteins within mitochondria.
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DOI:
10.1371/journal.pone.0030767
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Arakawa H
Arakawa H
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Nakamura Y;Kitamura N;Shinogi D;Yoshida M;Goda O;Murai R;Kamino H;Arakawa H

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Mieap是一种p53诱导蛋白,通过修复不健康的线粒体来控制线粒体质量。在修复过程中,Mieap通过与NIX相互作用诱导线粒体内溶酶体蛋白的积累(Mieap诱导的线粒体内溶酶体样细胞器的积累称为MALM),导致氧化的线粒体蛋白的消除。在这里,我们报告说,一个额外的线粒体外膜蛋白,BNIP3,也参与了MALM。BNIP3通过BNIP3的BH 3结构域和Mieap的卷曲螺旋结构域以活性氧(ROS)依赖性方式与Mieap相互作用。内源性BNIP3表达的敲低严重抑制了MALM。尽管BNIP3或NIX的过表达没有引起线粒体膜电位(MMP)的显著变化,但是所有三种外源蛋白Mieap、BNIP3和NIX的共表达引起MMP的显著降低,这意味着Mieap、BNIP3和NIX在线粒体外膜处的物理相互作用可以调节线粒体双膜中孔的打开。这种效应与细胞死亡无关。这些结果表明,两个线粒体外膜蛋白,BNIP3和NIX,介导MALM,以维持线粒体的完整性。Mieap、BNIP3和NIX在线粒体外膜的物理相互作用可能在溶酶体蛋白从细胞质易位到线粒体基质中起关键作用。
Mieap, a p53-inducible protein, controls mitochondrial quality by repairing unhealthy mitochondria. During repair, Mieap induces the accumulation of intramitochondrial lysosomal proteins (designated MALM for Mieap-induced accumulation of lysosome-like organelles within mitochondria) by interacting with NIX, leading to the elimination of oxidized mitochondrial proteins. Here, we report that an additional mitochondrial outer membrane protein, BNIP3, is also involved in MALM. BNIP3 interacts with Mieap in a reactive oxygen species (ROS)-dependent manner via the BH3 domain of BNIP3 and the coiled-coil domains of Mieap. The knockdown of endogenous BNIP3 expression severely inhibited MALM. Although the overexpression of either BNIP3 or NIX did not cause a remarkable change in the mitochondrial membrane potential (MMP), the co-expression of all three exogenous proteins, Mieap, BNIP3 and NIX, caused a dramatic reduction in MMP, implying that the physical interaction of Mieap, BNIP3 and NIX at the mitochondrial outer membrane may regulate the opening of a pore in the mitochondrial double membrane. This effect was not related to cell death. These results suggest that two mitochondrial outer membrane proteins, BNIP3 and NIX, mediate MALM in order to maintain mitochondrial integrity. The physical interaction of Mieap, BNIP3 and NIX at the mitochondrial outer membrane may play a critical role in the translocation of lysosomal proteins from the cytoplasm to the mitochondrial matrix.
DOI: 10.1007/s12265-010-9174-x
发表时间: 2010-08
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发表时间: 2011-01-17
期刊: PloS one
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作者:
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影响因子: 3.9
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