PilT and PilU are homohexameric ATPases that coordinate to retract type IVa pili.
Plos Genetics
Chlebek, Jennifer L JL; Hughes, Hannah Q HQ; Ratkiewicz, Aleksandra S AS; Rayyan, Rasman R; Wang, Joseph Che-Yen JC; Herrin, Brittany E BE; Dalia, Triana N TN; Biais, Nicolas N; Dalia, Ankur B AB