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首页> 外文期刊>Current Biology: CB >A role for Tim21 in membrane-potential-dependent preprotein sorting in mitochondria
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A role for Tim21 in membrane-potential-dependent preprotein sorting in mitochondria

机译:Tim21在线粒体膜电位依赖性前蛋白分选中的作用

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摘要

The mitochondrial inner membrane harbors complexes of the respiratory chain and translocase complexes for preproteins. The membrane potential generated by the respiratory chain is essential for ATP production by the mitochondrial ATP synthase and as a driving force for protein import [1-7]. It is generally believed that the preprotein translocases just use the membrane potential without getting into physical contact with respiratory-chain complexes [3, 6, 7]. Here, we show that the presequence translocase interacts with the respiratory chain. Tim21, a specific subunit of the sorting-active presequence translocase [8, 9], recruits proton-pumping respiratory-chain complexes and stimulates preprotein insertion. Thus, the presequence translocase cooperates with the respiratory chain and promotes membrane-potential-dependent protein sorting into the inner mitochondrial membrane. These findings suggest a new coupling mechanism in an energy-transducing membrane.
机译:线粒体内膜包含呼吸链复合物和前蛋白质的跨酶复合物。呼吸链产生的膜电位对于线粒体ATP合酶产生ATP至关重要,并且是蛋白质导入的驱动力[1-7]。通常认为,前蛋白转座酶仅利用膜电位而不与呼吸链复合物发生物理接触[3,6,7]。在这里,我们显示了前转位酶与呼吸链相互作用。 Tim21是分选活跃的前序列转位酶的一个特定亚基[8,9],可募集质子泵呼吸链复合物并刺激前蛋白的插入。因此,序列前转位酶与呼吸链协同作用,并促进膜电位依赖性蛋白分选进入线粒体内膜。这些发现暗示了在能量传导膜中的新的偶联机制。

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