The protein import motor of mitochondria |
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Authors: | Neupert Walter Brunner Michael |
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Institution: | Institut für Physiologische Chemie, Universit?t München, Butenandtstrabetae 5, Geb?ude B, D-81377 Munich, Germany. neupert@bio.med.uni-muenchen.de |
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Abstract: | 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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