DNA-dependent ATPase and 5'-3' DNA helicase required for the maintenance of mitochondrial (kinetoplast) genome stability. Involved in processing of minicircle Okazaki fragments. ATP + H2O = ADP + H(+) + phosphate Monomer. Enriched in the antipodal sites flanking the kDNA disk. Belongs to the helicase family. PIF1 subfamily.