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Twisting changes of the actin helical structure associated with its filament extensibility upon activation of frog skeletal muscles stretched to non-overlap length of thin and thick filaments were investigated by measuring the axial spacing of the actin-based first layerline component in the X-ray diffraction pattern. In the first layer-line complex, the thin and thick filament-based components could be resolved in the radial region close to the meridian, by a Gaussian deconvolution method [1]. We inspected the axial spacing change of the first actin layer line together with those of the actin 5.9-nm and 5.1nm layer lines upon activation.

2B1445 Alteration of the helical twist associated with the shortening of the thin actin filaments upon activation of skeletal muscles