Figure 11.

X-ray patterns of a hypothetical deformed discontinuous actin helix with the exaggerated step increase in strain from Fig. 3 ▸ and the helix containing only 29 monomers. Comparisons between (left) a relaxed and (right) a nonuniformly stretched discontinuous helix. (a) A three-dimensional plot of intensities of averaged X-ray diffraction for all Ψ. Grayscale plots of (b) intensities and (c) phase at Ψ = 0. The helix dimensions are as follows: helix length ∼790 Å, containing only 29 units with 13 subunits in six turns, subunit distance and length of one pitch 27.3 and 59.15 Å, respectively, radial position of a subunit (helix radius) 25 Å, equivalent subunit radius 1.5540 Å. Twenty-nine Bessel functions were used to calculate the intensity on any given layer line. The red dotted line references the equatorial line.