The protein import apparatus of the mitochondrial outer membrane

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Abstract
The majority of proteins within mitochondria are synthesized on cytosolic ribosomes and imported into the organelles. Protein complexes in the mitochondrial outer membrane harbour both the receptors that recognize these preproteins, and a translocation pore. These "receptor complexes" are the entry points for most preproteins, which are subsequently targeted to their final submitochondrial locations. The outer membrane complexes cooperate with the import machinery of the inner membrane to target preproteins to the inner membrane itself, the matrix, or, in some cases, to the intermembrane space. In isolated outer membranes, these complexes are capable of accurately importing preproteins destined for the outer membrane. Our current understanding of the composition, function, and biogenesis of these outer membrane receptor complexes is the focus of this article. Key words: mitochondria, outer membrane, protein import, receptors.