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- W2073070083 abstract "We have identified a novel mitochondrial targeting signal in the precursor of the DNA helicase Hmi1p of Saccharomyces cerevisiae that is located at the C terminus of the protein. Similar to classical N-terminal presequences, this C-terminal targeting signal consists of a stretch of positively charged amino acids that has the potential to form an amphipathic alpha-helix. Deletion of the C-terminal 36 amino acids of helicase resulted in loss of import into mitochondria, while deletion of the N-terminal 40 amino acids had no effect. When C-terminal regions of the helicase were placed at the C terminus of a passenger protein, dihydrofolate reductase, the resulting fusion proteins were directed into the mitochondrial matrix, and the C-terminal region of helicase became proteolytically processed. Import of helicase occurs in a C- to N-terminal direction; it requires a membrane potential and the TIM17-23 translocase together with mitochondrial Hsp70. Helicase is the only mitochondrial matrix protein identified thus far with a cleavable targeting signal at its C terminus." @default.
- W2073070083 created "2016-06-24" @default.
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- W2073070083 date "1999-07-01" @default.
- W2073070083 modified "2023-10-18" @default.
- W2073070083 title "The DNA Helicase, Hmi1p, Is Transported into Mitochondria by a C-terminal Cleavable Targeting Signal" @default.
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- W2073070083 doi "https://doi.org/10.1074/jbc.274.30.20937" @default.
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