control of [[protein|7024E4162A6D827069F882FDEACA696EBC05DD40]] activity, required for full [[protein|7024E4162A6D827069F882FDEACA696EBC05DD40]] activity, activates the flagellar type III secretion export apparatus by the membrane protein [[protein|6ED6C3DDC4F3142FD01D32840D955B7E4A19F385]]