Fig 5. The maximum work per ATP produced by the motor.

(A,B) The maximum work per ATP as a function of two dimensionless kinetic parameters for two levels of asymmetry in the force-induced unbinding rates: (A) $\overline{\delta }=6\text{nm}$ and ${\delta }_a=0.1\overline{\delta }$ and (B) $\overline{\delta }={\delta }_a=6\text{nm}$. In each plot, the maximum is marked by a cross. (C) The work per ATP in the optimal kinetic regime as a function of the mean distance parameter $\overline{\delta }$ and its asymmetry distance δ_a. The dashed line separates different bond types with respect to their behavior under backward load: The area below the dashed line describes a slip bond, the area above the line a catch bond, and the line itself an ideal bond.