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Translocation arrest of an intramitochondrial sorting signal next to Tim11 at the inner-membrane import site.

机译:在内膜导入位点,靠近Tim11的线粒体内分类信号易位。

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The import of proteins from the cytosol into the mitochondrial matrix involves the concerted action of two separate import systems: the TOM system in the outer membrane, and the TIM system in the inner membrane. Here we report that the inner-membrane system also sorts proteins to the intermembrane space. Some intermembrane-space proteins, such as cytochromes b2 and c1, are synthesized with a complex pre-sequence consisting of a positively charged matrix targeting signal followed by an uncharged sequence that acts as sorting signal for the intermembrane space. We show that this sorting signal can be efficiently crosslinked to an inner-membrane protein of relative molecular mass 11K after the mature part of the precursor has been sorted to the intermembrane space. The 11K protein, which we term Tim11, is a component of the protein import system in the inner membrane.
机译:蛋白质从细胞质中导入线粒体基质涉及两个独立的导入系统的协同作用:外膜中的TOM系统和内膜中的TIM系统。在这里我们报告内膜系统也将蛋白质排序到膜间空间。合成了一些膜间空间蛋白,例如细胞色素b2和c1,它们具有复杂的先序列,该序列由带正电荷的基质靶向信号组成,后接一个不带电荷的序列,该序列充当膜间空间的分类信号。我们表明,在前体的成熟部分被分类到膜间空间后,该分类信号可以有效地交联到相对分子质量为11K的内膜蛋白上。 11K蛋白(我们称为Tim11)是内膜蛋白导入系统的一个组成部分。

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