TOMM20Mitochondrial import receptor subunit TOM20 homolog is a protein that in humans is encoded by the TOMM20 gene. TOM20 is one of the receptor systems of the translocase of the outer membrane complex in the outer [mitochondrial membrane].FunctionIn mitochondrial protein import, TOM20 is closely associated with the pore-forming TOM40 complex and acts by recognizing and binding the N-terminal MTSs, which form an amphipathic alpha helix and aid passage of the target proteins into the mitochondrial matrix.