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 (By similarity). Seems to control the nucleotide-dependent binding of mitochondrial HSP70 to substrate proteins (By similarity). Binds ATP (PubMed:17137349). Interacts with copper ions Cu(2+) (PubMed:20018591). Probable component of the PAM complex, at least composed of SSC1 (mtHsp70), MGE1, TIM44, PAM16/TIM16, PAM17 and PAM18/TIM14. Interacts with SSQ1. By UV-B. Belongs to the GrpE family.