Motility protein B also known as MotB is a bacterial protein that is encoded by the motB gene. It`s a component of the flagellar motor. More specifically, MotA and MotB makes the stator of a flagellum and surround the rotor as a ring of about 8-10 particles. MotA and MotB are integral membrane proteins. While both MotA and MotB surround the MS ri.... Found on http://en.wikipedia.org/wiki/MotB