Motility protein A, also known as
MotA, is a bacterial
protein that is encoded by the
motA gene. It is a component of the
flagellar motor. More specifically, MotA and
MotB make the
stator of a H
+ driven bacterial flagellum and surround the rotor as a ring of about 8–10 particles. MotA and MotB are
integral membrane proteins. MotA has four transmembrane domains.