The mitochondrial preprotein translocases of the outer membrane (Tom) is a multisubunit protein complex that facilitates the import of nucleus-encoded precursor proteins across the mitochondrial outer membrane. The Tom machinery consists of import receptors for the initial binding of cytosolically synthesized preproteins and a general import pore (GIP) for the membrane translocation of various preproteins into the mitochondria. The import receptors include Tom20 and Tom22, which form a heteromeric receptor complex that initiates the insertion of newly synthesized proteins into the outer membrane and then directs the precursor protein into the GIP. In yeast, Tom22 is the essential component of the import receptor complex as it functions as both a receptor for the preproteins and serves as a docking point for both Tom20 and the GIP.
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Protein Aliases: Mitochondrial 20 kDa outer membrane protein; Mitochondrial import receptor subunit TOM20 homolog; outer mitochondrial membrane receptor rTOM20; Outer mitochondrial membrane receptor Tom20; translocase of outer mitochondrial membrane 20 homolog type II
Gene Aliases: 1810060K07Rik; BB284719; Gm19268; KIAA0016; MAS20; mKIAA0016; MOM19; TOM20; TOMM20
Molecular Function: primary active transporter