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- W1994498471 abstract "Microtubules have been implicated as being necessary for the secretion of insulin from beta-cells, although the mechanism by which cytoplasmic microtubules contribute to the release of insulin is unknown. Kinesin is a microtubule-dependent adenosine triphosphatase (ATPase) that is thought to be responsible for the intracellular transport of vesicles and organelles. In this manuscript, the purification and preliminary characterization of a beta-cell form of kinesin is described. A 120-kilodalton antikinesin-reactive polypeptide was identified on blots when cultured insulinoma tumor cell lines were subjected to immunoblot analysis using monoclonal antibodies specific for the heavy chain of mammalian kinesin. The beta-cell form of kinesin was isolated from solid rat insulinoma tumors by cosedimentation of the kinesin with microtubules from tissue homogenates in the presence of adenylyl-imidodiphosphate. The beta-cell kinesin was further purified by gel filtration chromatography, and then the pure enzyme was characterized using in vitro assays. Although beta-cell kinesin showed little ATPase activity alone, the enzyme exhibited considerable ATP hydrolysis activity in the presence of taxol-stabilized microtubules. Moreover, in motility assays beta-cell kinesin was able to translocate microtubules across microscope coverslips in the presence of Mg(2+)-ATP. In summary, we report the identity of a novel islet beta-cell form of the microtubule-dependent ATPase kinesin and suggest a possible contribution of the microtubule cytoskeleton in insulin secretion." @default.
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- W1994498471 title "The identification, purification, and characterization of a pancreatic beta-cell form of the microtubule adenosine triphosphatase kinesin." @default.
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- W1994498471 doi "https://doi.org/10.1210/endo.131.1.1612013" @default.
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