Crossref journal-article
Rockefeller University Press
The Journal of Cell Biology (291)
Abstract

Previous genetic and biochemical studies have led to the hypothesis that the essential mitotic bipolar kinesin, KLP61F, cross-links and slides microtubules (MTs) during spindle assembly and function. Here, we have tested this hypothesis by immunofluorescence and immunoelectron microscopy (immunoEM). We show that Drosophila embryonic spindles at metaphase and anaphase contain abundant bundles of MTs running between the spindle poles. These interpolar MT bundles are parallel near the poles and antiparallel in the midzone. We have observed that KLP61F motors, phosphorylated at a cdk1/cyclin B consensus domain within the BimC box (BCB), localize along the length of these interpolar MT bundles, being concentrated in the midzone region. Nonphosphorylated KLP61F motors, in contrast, are excluded from the spindle and display a cytoplasmic localization. Immunoelectron microscopy further suggested that phospho-KLP61F motors form cross-links between MTs within interpolar MT bundles. These bipolar KLP61F MT-MT cross-links should be capable of organizing parallel MTs into bundles within half spindles and sliding antiparallel MTs apart in the spindle midzone. Thus we propose that bipolar kinesin motors and MTs interact by a “sliding filament mechanism” during the formation and function of the mitotic spindle.

Bibliography

Sharp, D. J., McDonald, K. L., Brown, H. M., Matthies, H. J., Walczak, C., Vale, R. D., Mitchison, T. J., & Scholey, J. M. (1999). The Bipolar Kinesin, KLP61F, Cross-links Microtubules within Interpolar Microtubule Bundles of Drosophila Embryonic Mitotic Spindles. The Journal of Cell Biology, 144(1), 125–138.

Authors 8
  1. David J. Sharp (first)
  2. Kent L. McDonald (additional)
  3. Heather M. Brown (additional)
  4. Heinrich J. Matthies (additional)
  5. Claire Walczak (additional)
  6. Ron D. Vale (additional)
  7. Timothy J. Mitchison (additional)
  8. Jonathan M. Scholey (additional)
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Dates
Type When
Created 23 years, 1 month ago (July 26, 2002, 12:45 p.m.)
Deposited 2 years, 1 month ago (July 28, 2023, 8:01 p.m.)
Indexed 2 months ago (June 27, 2025, 10:24 a.m.)
Issued 26 years, 7 months ago (Jan. 11, 1999)
Published 26 years, 7 months ago (Jan. 11, 1999)
Published Online 26 years, 7 months ago (Jan. 11, 1999)
Published Print 26 years, 7 months ago (Jan. 11, 1999)
Funders 0

None

@article{Sharp_1999, title={The Bipolar Kinesin, KLP61F, Cross-links Microtubules within Interpolar Microtubule Bundles of Drosophila Embryonic Mitotic Spindles}, volume={144}, ISSN={1540-8140}, url={http://dx.doi.org/10.1083/jcb.144.1.125}, DOI={10.1083/jcb.144.1.125}, number={1}, journal={The Journal of Cell Biology}, publisher={Rockefeller University Press}, author={Sharp, David J. and McDonald, Kent L. and Brown, Heather M. and Matthies, Heinrich J. and Walczak, Claire and Vale, Ron D. and Mitchison, Timothy J. and Scholey, Jonathan M.}, year={1999}, month=jan, pages={125–138} }