Figure 2.

The effect of velocity on the mechanical and energetic properties. (a) Force-velocity relation for the models with two tensing steps (solid line) and one tensing step (dashed line). Solid symbols represent the experimental data of Edman (36) and open symbols those of Ford et al. (55). (b) The effect of velocity on the rate of turnover (ATPase) of the models with two tensing steps (solid line) and one tensing step (dashed line). (c) The effect of shortening velocity on the thermodynamic efficiency of the models with two tensing steps (solid line) and one tensing step (dashed line). (d) The effect of velocity on the occupancies of attached states for the model with two tensing steps. Shown are the occupancy of all attached heads (black line), pretensing heads (gray line), midtensing heads (dotted line), and posttensing heads (dashed line).