New splicing variants of mitochondrial Rho GTPase-1 (Miro1) transport peroxisomes.

New splicing variants of mitochondrial Rho GTPase-1 (Miro1) transport peroxisomes.
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DOI:
10.1083/jcb.201708122
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发表时间:
2018-02-05
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Fujiki Y
Fujiki Y
中科院分区:
其他
文献类型:
--
作者:
Okumoto K;Ono T;Toyama R;Shimomura A;Nagata A;Fujiki Y

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哺乳动物细胞中过氧化物酶体依赖微管的长距离运动的机制尚不清楚。奥本等人。鉴定出人类线粒体 Rho GTPase-1 (Miro1) 的剪接变体,这些变体定位于过氧化物酶体并将这些细胞器与包括 TRAK2 在内的微管依赖性转运复合物连接起来。哺乳动物细胞中发生过氧化物酶体依赖微管的长距离运动。然而,其分子机制仍不清楚。在这项研究中,我们鉴定了人类线粒体 Rho GTPase-1 (Miro1) 的三种不同剪接变体,每种变体在跨膜结构域的上游分别包含氨基酸序列插入 1(命名为 Miro1-var2)、2(Miro1-var3)以及 1 和 2(Miro1-var4)。 Miro1-var4 和 Miro1-var2 以依赖于胞质受体 Pex19p 识别的插入 1 的方式定位于过氧化物酶体。 Miro1-var4 的外源表达诱导过氧化物酶体在细胞周围的积累,并增强过氧化物酶体沿着微管的长距离运动。通过敲低 MIRO1 来耗尽所有 Miro1 变体可抑制过氧化物酶体的长距离运动。这种被废除的运动可以通过过氧化物酶体 Miro1 变体的重新表达来恢复。总的来说,我们的研究结果首次确定了过氧化物酶体定位的 Miro1 变体作为衔接蛋白,将过氧化物酶体与微管依赖性转运复合物(包括哺乳动物细胞中过氧化物酶体的细胞内易位中的 TRAK2)连接起来。
The mechanisms underlying microtubule-dependent long-distance movement of peroxisomes in mammalian cells are unclear. Okumoto et al. identify splicing variants of human mitochondrial Rho GTPase-1 (Miro1) that localize to peroxisomes and that link these organelles to microtubule-dependent transport complexes including TRAK2. Microtubule-dependent long-distance movement of peroxisomes occurs in mammalian cells. However, its molecular mechanisms remain undefined. In this study, we identified three distinct splicing variants of human mitochondrial Rho GTPase-1 (Miro1), each containing amino acid sequence insertions 1 (named Miro1-var2), 2 (Miro1-var3), and both 1 and 2 (Miro1-var4), respectively, at upstream of the transmembrane domain. Miro1-var4 and Miro1-var2 are localized to peroxisomes in a manner dependent on the insertion 1 that is recognized by the cytosolic receptor Pex19p. Exogenous expression of Miro1-var4 induces accumulation of peroxisomes at the cell periphery and augments long-range movement of peroxisomes along microtubules. Depletion of all Miro1 variants by knocking down MIRO1 suppresses the long-distance movement of peroxisomes. Such abrogated movement is restored by reexpression of peroxisomal Miro1 variants. Collectively, our findings identify for the first time peroxisome-localized Miro1 variants as adapter proteins that link peroxisomes to the microtubule-dependent transport complexes including TRAK2 in the intracellular translocation of peroxisomes in mammalian cells.
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