Outer mitochondrial translocase required to remove mislocalized tail-anchored transmembrane proteins on mitochondria (By similarity). Specifically recognizes and binds tail-anchored transmembrane proteins: acts as a dislocase that mediates the ATP-dependent extraction of mistargeted tail-anchored transmembrane proteins from the mitochondrion outer membrane (By similarity). Also plays a critical role in regulating the surface expression of AMPA receptors (AMPAR), thereby regulating synaptic plasticity and learning and memory (PubMed:21496646). Required for NMDA-stimulated AMPAR internalization and inhibition of GRIA1 and GRIA2 recycling back to the plasma membrane; these activities are ATPase-dependent (PubMed:21496646). [protein]-with a C-terminal TM segment(out) + ATP + H2O = [protein]-with a C-terminal TM segment(in) + ADP + H(+) + phosphate Interacts with GRIA2 and GRIP1 in an ATP-dependent manner (PubMed:21496646). ATAD1-catalyzed ATP hydrolysis disrupts not only its binding to GRIA2 and GRIP1, but also interaction between GRIP1 and GRIA2, leading to AMPAR complex disassembly (PubMed:21496646). Belongs to the AAA ATPase family. MSP1 subfamily. Truncated N-terminus.