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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

The product of the Drosophila gene, Glued, is the functional homologue of the p150Glued component of the vertebrate dynactin complex.

p150Glued is the largest polypeptide in the dynactin complex, a protein heteromultimer that binds to and may mediate the microtubule-based motor cytoplasmic dynein. Cloning of a cDNA encoding p150Glued from rat revealed 31% amino acid sequence identity with the product of the Drosophila gene, Glued. A dominant Glued mutation results in neuronal disruption; null mutations are lethal. However, the Glued gene product has not been characterized. To determine whether the Glued polypeptide is functionally similar to vertebrate p150Glued, we characterized the Glued protein in the Drosophila S-2 cell line. Antibodies raised against Glued were used to demonstrate that this protein sediments exclusively at 20 S, and associates with microtubules in a salt- and ATP-dependent manner. Immunoprecipitations from S-2 cytosol with the anti-Glued antibody resulted in the co-precipitation of subunits of both cytoplasmic dynein and the dynactin complex. An affinity column with covalently bound Glued protein retained cytoplasmic dynein from S-2 cytosol. Based on these observations, we conclude that Glued is a component of a dynactin complex in Drosophila and binds to cytoplasmic dynein, and therefore the mutant Glued phenotypes can be interpreted as resulting from a disruption in the function of the dynactin complex.[1]


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