Abstract
The bacterial flagellum is a macromolecular complex essential for the motility and virulence of several bacteria. In spirochetes, such as Leptospira interrogans, the flagellum has a unique structure and location, being periplasmic and presenting a specific component called "P-collar" (FlbD). The FliL protein also plays an important role in generating torque in the flagellar motor, interac…