Motor protein strut

The part I don’t get is how exactly is the movement directional. Wikipedia says that microtubules are polar, so I can see the asymmetry there. But when you look at the single step, what is there to prevent a step in a reverse direction? Gradient over a single step should be minuscule. Or there is nothing to prevent this, and we see a result of a random walk in electric gradient? Wikipedia links to but without access to the article, I’m not sure how much of the influence this effect would have, or how universal it is.

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The woods in the cabin

Photo Manipulations with Foods by Ars Thanea