OPA1 processing controls mitochondrial fusion and is regulated by mRNA splicing, membrane potential, and Yme1L.

OPA1 processing controls mitochondrial fusion and is regulated by mRNA splicing, membrane potential, and Yme1L.
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DOI:
10.1083/jcb.200704110
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发表时间:
2007-08-27
影响因子:
7.8
通讯作者:
Chan, David C.
Chan, David C.
中科院分区:
生物学1区
文献类型:
--
作者:
Song, Zhiyin;Chen, Hsiuchen;Fiket, Maja;Alexander, Christiane;Chan, David C.

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OPA 1是一种在显性视神经萎缩中突变的动力蛋白相关的鸟苷三磷酸酶,是线粒体融合所必需的。线粒体加工肽酶的蛋白水解切割从八种信使RNA(mRNA)剪接形式产生长同种型,而在蛋白酶位点S1和S2处的进一步切割产生短形式。使用OPA 1-null细胞,我们开发了一个细胞系统来研究单个OPA 1剪接形式在线粒体融合中的功能。只有除了一个或多个短同种型之外还产生长同种型的mRNA剪接形式支持实质性线粒体融合活性。长和短OPA 1同种型本身几乎没有活性,但是,当共表达时,它们在功能上相互补充。线粒体膜电位的丧失使长亚型不稳定,并增强OPA 1在S1而不是S2的裂解。S2处的切割由i-AAA蛋白酶Yme 1 L调节。我们的研究结果表明,哺乳动物细胞有多种途径来控制线粒体融合,通过调节OPA 1亚型的频谱。
OPA1, a dynamin-related guanosine triphosphatase mutated in dominant optic atrophy, is required for the fusion of mitochondria. Proteolytic cleavage by the mitochondrial processing peptidase generates long isoforms from eight messenger RNA (mRNA) splice forms, whereas further cleavages at protease sites S1 and S2 generate short forms. Using OPA1-null cells, we developed a cellular system to study how individual OPA1 splice forms function in mitochondrial fusion. Only mRNA splice forms that generate a long isoform in addition to one or more short isoforms support substantial mitochondrial fusion activity. On their own, long and short OPA1 isoforms have little activity, but, when coexpressed, they functionally complement each other. Loss of mitochondrial membrane potential destabilizes the long isoforms and enhances the cleavage of OPA1 at S1 but not S2. Cleavage at S2 is regulated by the i-AAA protease Yme1L. Our results suggest that mammalian cells have multiple pathways to control mitochondrial fusion through regulation of the spectrum of OPA1 isoforms.
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影响因子: 5.3
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影响因子: 7.8
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