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The presequence translocase of the inner mitochondrial membrane (TIM23 complex) operates at a central junction of protein import. It accepts preproteins from the outer membrane TOM complex and directs them to inner membrane insertion or, in cooperation with the presequence translocase-associated motor (PAM), to the matrix. Little is known of how the TIM23 complex coordinates these tasks. We have identified...
Mitochondrial proteins with N-terminal targeting signals are transported across the inner membrane via the presequence translocase, which consists of membrane-integrated channel proteins and the matrix Hsp70 import motor. It has not been known how preproteins are directed to the import channel. We have identified the essential protein Tim50, which exposes its major domain to the intermembrane space...
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