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Mitochondrial proteins are almost exclusively imported into mitochondria from the cytosol in an unfolded or partially folded conformation. Regardless of whether they are destined for the outer or inner membrane, the intermembrane space, or the matrix, proteins begin the importation process by crossing the mitochondrial outer membrane via a specialized protein import machinery whose main component...
TOM protein-conducting channels serve as the main entry sites into mitochondria for virtually all mitochondrial proteins. When incorporated into lipid bilayers, they form large, relatively nonspecific ion channels that are blocked by peptides derived from mitochondrial precursor proteins. Using single-channel electrical recordings, we analyzed the interactions of mitochondrial presequence peptides...