  Inside cells, various cargos are transported by teams of molecular motors.
Intriguingly, the motors involved generally have opposite pulling directions,
and the resulting cargo dynamics is a biased stochastic motion. It is an open
question how the cell can control this bias. Here we develop a model which
takes explicitly into account the elastic coupling of the cargo with each
motor. We show that bias can be simply controlled or even reversed in a
counterintuitive manner via a change in the external force exerted on the cargo
or a variation of the ATP binding rate to motors. Furthermore, the
superdiffusive behavior found at short time scales indicates the emergence of
motor cooperation induced by cargo-mediated coupling.
