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• W1567981493 abstract "The interaction of several basic peptides with yeast mitochondria has been analyzed. The peptides were selected for their ability to block a cationic channel of the outer membrane, the peptide-sensitive channel. These peptides possess common characteristics, such as a net positive charge superior to 2 and the capacity to form amphiphilic structures. They can be divided into two classes as follows: peptides of class I derived from mitochondrial signal peptides, such as the presequence of cytochrome c oxidase subunit IV, e.g. pCyt OX IV (1-12) Y; and peptides of class II unrelated to the mitochondria, such as dynorphin B (1-13). Class I peptides inhibited the translocation of a chimeric protein, cytochrome b2-DHFR, into the mitochondrial matrix, whereas peptides of class II failed to inhibit this import. Experiments with iodinated pCyt OX IV (1-12) Y and dynorphin B (1-13) showed, however, that both types of peptides were imported into yeast mitochondria in vitro and subsequently degraded. At 30 degrees C, two import mechanisms could be distinguished; the mitochondrial presequences (class I) were translocated into the matrix in a temperature- and potential-sensitive manner, probably along the general import pathway, while class II dynorphin B (1-13) was imported into the intermembrane space by a process that was neither temperature- nor potential-sensitive. At 0 degree C, both peptides were imported in a class II manner. The class II characteristics suggested the existence of a direct pathway into the intermembrane space, which may be associated with the peptide-sensitive channel. This hypothesis is substantiated by the competition for the import into the mitochondria between peptides of the two classes. The import of pCyt OX (1-12) Y was inhibited at 30 degrees C only by peptides of class I, IV whereas, at 0 degree C, this import was also inhibited by peptides of class II. Import of peptides of the latter class was inhibited by peptides of the two classes both at 0 degree C and 30 degrees C." @default.
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• W1567981493 title "Basic peptides can be imported into yeast mitochondria by two distinct targeting pathways. Involvement of the peptide-sensitive channel of the outer membrane." @default.
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• W1567981493 doi "https://doi.org/10.1016/s0021-9258(17)36842-4" @default.
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