  In this work we study the assisted translocation of a polymer across a
membrane nanopore, inside which a molecular motor exerts a force fuelled by the
hydrolysis of ATP molecules. In our model the motor switches to its active
state for a fixed amount of time, while it waits for an ATP molecule binding
and triggering the impulse, during an exponentially distributed time lapse. The
polymer is modelled as a beads-springs chain with both excluded volume and
bending contributions, and moves in a stochastic three dimensional environment
modelled with a Langevin dynamics at fixed temperature. The resulting dynamics
shows a Michaelis-Menten translocation velocity that depends on the chain
flexibility. The scaling behavior of the mean translocation time with the
polymer length for different bending values is also investigated.
