part_of protein transport pathway mitochondria homeostasis pathway mitochondrial protein import pathway 2015-09-24T14:05:05Z Mitochondria are essential organelles that provide most of the ATP fuel for the cell, are the site of several important metabolic pathways and play essential roles in calcium storage, signaling and apoptosis. Of the many proteins involved, only 13 are encoded in the mammalian mitochondrial DNA. The remaining ~99% of mitochondrial proteins are translocated from the cytosol via a complex, multicomponent pathway system. Mitochondria-encoded proteins are translocated from the mitochondrial matrix into the inner mitochondrial membrane by a single system. Mitochondrial protein import PW:0001962 pathway protein targeting to mitochondrion vpetri