期刊
NATURE REVIEWS MOLECULAR CELL BIOLOGY
卷 3, 期 8, 页码 555-565出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nrm878
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Proteins that are destined for the matrix of mitochondria are transported into this organelle by two translocases: the TOM complex, which transports proteins across the outer mitochondrial membrane; and the TIM23 complex, which gets them through the inner mitochondrial membrane. Two models have been proposed to explain how this protein-import machinery works - a targeted Brownian ratchet, in which random motion is translated into vectorial motion, or a 'power stroke', which is exerted by a component of the import machinery. Here, we review the data for and against each model.
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