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The effect of Ca2+ on the structure of synthetic filaments of smooth muscle myosin

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Abstract

Using electron microscopy and negative staining we have studied the effect of Ca2+ on the structure of synthetic filaments of chicken gizzard smooth muscle myosin under conditions applied by Frado and Craig (1989) for demonstration of the influence of Ca2+ on the structure of synthetic filaments of scallop striated muscle myosin. The results show that Ca2+ induces the transition of compact, ordered structure of filaments with a 14.5 nm axial repeat of the myosin heads close to the filament backbone (characteristic of the relaxing conditions) to a disordered structure with randomly arranged myosin heads together with subfragments-2 (S-2) seen at a distance of up to 50 nm from the filament backbone. This order/disorder transition is much more pronounced in filaments formed of unphosphorylated myosin, since a substantial fraction of phosphorylated filaments in the relaxing solution is already disordered due to phosphorylation. Under rigor conditions some of the filaments of unphosphorylated and phosphorylated myosin retain a certain degree of order resembling those under relaxing conditions, while most of them have a substantially disordered appearance. The results indicate that Ca2+-induced movement of myosin heads away from the filament backbone is an inherent property of smooth muscle myosin, like molluscan muscle myosin regulated exclusively by Ca2+ binding, and can play a modulatory role in smooth muscle contraction.

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Podlubnaya, Z., Kulikova, N. & Dąbrowska, R. The effect of Ca2+ on the structure of synthetic filaments of smooth muscle myosin. J Muscle Res Cell Motil 20, 547–554 (1999). https://doi.org/10.1023/A:1005533020784

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