Bcl-2 family interaction with the mitochondrial morphogenesis machinery.

Bcl-2 family interaction with the mitochondrial morphogenesis machinery.
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DOI:
10.1038/cdd.2010.89
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发表时间:
2011-02
影响因子:
12.4
通讯作者:
--
中科院分区:
生物学1区
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--
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线粒体动力学和细胞凋亡的调节是维持细胞健康的关键。作为细胞凋亡调控中心的bcl2家族蛋白,在维持线粒体网络方面也发挥着重要作用。在此,我们报道了Bax和Bak参与了小鼠胚胎成纤维细胞、原代小鼠神经元和人结肠癌细胞线粒体融合的调节。为了研究Bcl2家族成员如何调控线粒体形态发生,我们测定了Bclxl和Bax之间的一系列嵌合体与丝裂原、Mfn1和Mfn2的结合。与Mfn1和Mfn2共沉淀的嵌合体(含Bax螺旋5(H5)取代BclxL的H5(BclXL/BaxH5))免疫共沉淀明显优于野生型Bax或BclxL。Bclxl/BaxH5在细胞内的表达降低了Mfn1和Mfn2的迁移率,与异位Mfn1和Mfn2以及内源性Mfn2共定位的程度高于野生型Bax。最终,BclxL/BaxH5在健康细胞中诱导了大量的线粒体断裂。因此,我们认为,BclxL/BaxH5通过结合和抑制Mfn1和Mfn2的活性来干扰线粒体的形态,支持了这样的假设,即在健康细胞中,Bclxl/BaxH5家族成员有能力通过结合丝裂原蛋白来调节线粒体的形态。
The regulation of both mitochondrial dynamics and apoptosis is key for maintaining the health of a cell. Bcl-2 family proteins, central in apoptosis regulation, also play roles in maintenance of the mitochondrial network. Here we report that Bax and Bak participate in the regulation of mitochondrial fusion in mouse embryonic fibroblasts, primary mouse neurons and human colon carcinoma cells. To assess how Bcl-2 family members may regulate mitochondrial morphogenesis we determined the binding of a series of chimeras between Bcl-xL and Bax to the mitofusins, Mfn1 and Mfn2. One chimera (containing helix 5 (H5) of Bax replacing H5 of Bcl-xL (Bcl-xL/Bax H5)) co-immunoprecipitated with Mfn1 and Mfn2 significantly better than either wild type Bax or Bcl-xL. Expression of Bcl-xL/Bax H5 in cells reduced the mobility of Mfn1 and Mfn2 and co-localized with ectopic Mfn1 and Mfn2 as well as endogenous Mfn2 to a greater extent than wild type Bax. Ultimately, Bcl-xL/Bax H5 induced substantial mitochondrial fragmentation in healthy cells. Therefore, we propose that Bcl-xL/Bax H5 disturbs mitochondrial morphology by binding and inhibiting Mfn1 and Mfn2 activity, supporting the hypothesis that Bcl-2 family members have the capacity to regulate mitochondrial morphology through binding to the mitofusins in healthy cells.
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