Figure 14.

(a) In the geometric clutch model (Lindemann, 2002, 1994, e.g.) the probability of dynein (blue) attachment depends on inter-doublet spacing. (b-c) Tension and compression (black arrows) in curved doublets will lead to resultant transverse force components (red arrows) that pull the doublets together or push them apart. (d) Finite element mechanical simulations of curved beams with internal shear forces show that these forces lead to longitudinal tension (red) and compression (blue) in the doublets. (e) Tension and compression in curved doublets attached to one another produce transverse tensile (red) and compressive (blue) forces between the doublets. (f) A simulation of mathematical equations based on the geometric clutch model (Bayly and Wilson, 2014) shows that the transverse tensile force between doublets is greatest (red) near the base at the conclusion of the power stroke.