Lipid-Dependence of the Membrane Interactions of the Tim23 Channel Subunit of the Mitochondrial Protein Import Machinery

Abstract

The TIM23 complex of the mitochondrial inner membrane mediates the translocation and integration of most nuclear-encoded polypeptides that reside within the mitochondrion. The central subunit of this complex is Tim23, a voltage-gated channel-forming protein that constitutes part of the polypeptide-conducting channel. Tim23 has a bipartite domain organization with a carboxy-terminal integral membrane domain and an amino-terminal intrinsically disordered region that resides in the intermembrane space (IMS).