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- W2074501103 abstract "Excitation-contraction coupling in smooth muscle involves many processes, some of which are outlined in this article. The total amount of Ca2+ released on excitation is considerably in excess of the free Ca2+ concentration and this implies a high capacity, high affinity Ca2+ buffer system. The two major Ca2+-binding proteins are calmodulin and myosin. Only calmodulin has the appropriate binding affinity to act as a component of the Ca2+-buffer system. The Ca2+-calmodulin complex activates myosin light chain kinase and thus is involved in the regulation of contractile activity. Phosphorylation of myosin stabilizes an active conformation and promotes cross bridge cycling and is essential for the initiation of contraction. During the initial contractile response phosphorylation correlates to tension development and velocity of shortening. However, as contraction continues the extent of myosin phosphorylation and velocity often decreases but tension is maintained. In general, the Ca2+ transient is reflected by the extent of phosphorylation that in turn correlates with shortening velocity. Maintenance of tension at low phosphorylation levels is not accounted for within our understanding of the phosphorylation theory and thus alternative regulatory mechanisms have been implicated. Some of the possibilities are discussed." @default.
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- W2074501103 date "1986-12-01" @default.
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- W2074501103 title "Intracellular calcium and smooth muscle contraction" @default.
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- W2074501103 doi "https://doi.org/10.1016/0143-4160(86)90038-2" @default.
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