Essential component of the PAM complex, a complex required for the translocation of transit peptide-containing proteins from the inner membrane into the mitochondrial matrix in an ATP-dependent manner. Recruits mitochondrial HSP70 to drive protein translocation into the matrix using ATP as an energy source. Probable component of the PAM complex at least composed of a mitochondrial HSP70 protein, GrpE, tin-44, tim-16 and tim-14/dnj-21. The complex interacts with the tim-23 component of the TIM23 complex. Belongs to the Tim44 family.