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The mitochondrial intermediate peptidase (MIP) cleaves characteristic octapeptides, (F/L/I)XX(T/S/G)XXXX(↓), from the N-terminus of many imported mitochondrial proteins. This leader peptidase is activated by divalent cations and inactivated by thiol-blocking agents, properties which are typical of metallo- and cysteine-proteases, respectively. To elucidate the mechanism of action of MIP, we analyzed...
Mitochondrial intermediate peptidase (MIP) is a component of the mitochondrial protein import machinery required for maturation of nuclear-encoded precursor proteins targeted to the mitochondrial matrix or inner membrane. We previously characterized this enzyme in rat (RMIP) and Saccharomyces cerevisiae (YMIP) and showed that MIP activity is essential for mitochondrial function in yeast. We have now...
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