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3s0w is a 2 chain structure with sequence from Helicobacter pylori 26695. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
MOTB_HELPY MotA and MotB comprise the stator element of the flagellar motor complex. Required for the rotation of the flagellar motor. Might be a linker that fastens the torque-generating machinery to the cell wall (By similarity).