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Journal of Cell Science, Vol 107, Issue 6 1557-1569, Copyright © 1994 by Company of Biologists
JOURNAL ARTICLES |
TS Hays, ME Porter, M McGrail, P Grissom, P Gosch, MT Fuller and JR McIntosh
Department of Genetics and Cell Biology, University of Minnesota, St. Paul 55108-1020.
We have characterized a cytoplasmic dynein motor isoform that is present in extracts of Drosophila embryos. A prominent high molecular weight (HMW) polypeptide (> 400 kDa) is enriched in microtubules prepared from nucleotide-depleted embryonic extracts. Based on its ATP-sensitive microtubule binding activity, 20 S sedimentation coefficient, sensitivity to UV-vanadate and nucleotide specificity, the HMW polypeptide resembles cytoplasmic dyneins prepared from other organisms. The Drosophila cytoplasmic dynein acts as a minus-end motor that promotes microtubule translocation in vitro. A polyclonal antibody raised against the dynein heavy chain polypeptide was used to localize the dynein antigen in whole-mount preparations of embryos by immunofluorescence microscopy. These studies show that the dynein motor is associated with microtubules throughout embryogenesis, including mitotic spindle microtubules and microtubules of the embryonic nervous system.
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