Reversing the kinesin ratchet - a diverting tail

Motor proteins such as kinesin help to haul cellular cargo along microtubules, and they are mechanically programmed to move in one direction only -- towards either the rapidly growing plus ends, or the static minus ends. But what determines the direction of movement? To address this question, a chimaera has been created in which the head of a minus-end kinesin is attached to the tail ofa plus-end kinesin. And the chimaera moves in the opposite direction to the minus-end heads.