Dual Role of Mitochondrial Porin in Metabolite Transport across the Outer Membrane and Protein Transfer to the Inner Membrane

？ Metabolite channel of mitochondrial outer membrane promotes protein import ？ Porin interacts with carrier precursors accumulated in the intermembrane space ？ Porin recruits the carrier translocase of the inner mitochondrial membrane ？ Dual role of porin as metabolite channel and as coupling factor in protein impor