  We formulate and characterize a model to describe the dynamics of
semiflexible polymers in the presence of activity due to motor proteins
attached irreversibly to a substrate, and a transverse pulling force acting on
one end of the filament. The stochastic binding-unbinding of the motor proteins
and their ability to move along the polymer, generates active forces. As the
pulling force reaches a threshold value, the polymer eventually desorbs from
the substrate. Performing molecular dynamics simulations of the polymer in
presence of a Langevin heat bath, and stochastic motor activity, we obtain
desorption phase diagrams. The correlation time for fluctuations in desorbed
fraction increases as one approaches complete desorption, captured
quantitatively by a power law spectral density. We present theoretical analysis
of the phase diagram using mean field approximations in the weakly bending
limit of the polymer and performing linear stability analysis. This predicts
increase in the desorption force with the polymer bending rigidity, active
velocity and processivity of the motor proteins to capture the main features of
the simulation results.
