The neck-associated structural element that amplifies conformational changes in the motor domain into displacement.
Bound light chains help stabilize this elongated region. Changing lever-arm geometry can change step size without requiring a corresponding change in the distance of every chemical event at the ATP-binding site. [ref]
Molecular Biology of the Cell, 4th edition by Bruce Alberts and others. Chapters 3, 6 and 15, protein function, translation and cell signalling
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