Plays a role in the import of cytosolically synthesized preproteins into mitochondria. Binds the mature portion of precursor proteins. Interacts with cellular components, and possesses weak ATPase activity. May be a chaperone-like protein that helps to keep newly synthesized precursors in an unfolded import compatible state (By similarity). Interacts with HSP90A, VCP, ATP6V1D, KIAA0665, AMPK, and DMAP1 through its TPR repeat. Belongs to the Tom34 family.