ATPase component of the type IV secretion system Ptl required for secretion of assembled pertussis toxin (PTX) through the outer membrane (PubMed:10518754, PubMed:15322034, PubMed:8464913, PubMed:9393726, PubMed:17339350). Acts as a molecular motor to provide the energy that is required for the export of proteins (By similarity). ATP + H2O + cellular proteinSide 1 = ADP + phosphate + cellular proteinSide 2. Membrane associated. Tight association with the membrane is dependent on the toxin substrate, certain other Ptl proteins, and ATP binding and/or hydrolysis. Cotranscribed with ptxABCDE (PubMed:8606119). Activated by the two-component regulatory system BvgS/BvgA (PubMed:7592424). Belongs to the GSP E family.