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The mitochondrial outer membrane harbors two protein translocases that are essential for cell viability: the translocase of the outer mitochondrial membrane (TOM) and the sorting and assembly machinery (SAM). The precursors of β-barrel proteins use both translocases—TOM for import to the intermembrane space and SAM for export into the outer membrane. It is unknown if the translocases cooperate and...
Communication of mitochondria with the rest of the cell requires β-barrel proteins of the outer membrane. All β-barrel proteins are synthesized as precursors in the cytosol and imported into mitochondria by the general translocase TOM and the sorting machinery SAM. The SAM complex contains two proteins essential for cell viability, the channel-forming Sam50 and Sam35. We have identified the sorting...
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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