DOI: 10.1083/jcb.138.5.1041. Mitotic Spindle Positioning in <i>Saccharomyces cerevisiae</i> Is Accomplished by Antagonistically Acting Microtubule Motor Proteins

Mitotic Spindle Positioning in Saccharomyces cerevisiae Is Accomplished by Antagonistically Acting Microtubule Motor Proteins

10.1083/jcb.138.5.1041

Crossref journal-article

Rockefeller University Press

The Journal of Cell Biology (291)

Abstract

Proper positioning of the mitotic spindle is often essential for cell division and differentiation processes. The asymmetric cell division characteristic of budding yeast, Saccharomyces cerevisiae, requires that the spindle be positioned at the mother–bud neck and oriented along the mother–bud axis. The single dynein motor encoded by the S. cerevisiae genome performs an important but nonessential spindle-positioning role. We demonstrate that kinesin-related Kip3p makes a major contribution to spindle positioning in the absence of dynein. The elimination of Kip3p function in dyn1Δ cells severely compromised spindle movement to the mother–bud neck. In dyn1Δ cells that had completed positioning, elimination of Kip3p function caused spindles to mislocalize to distal positions in mother cell bodies. We also demonstrate that the spindle-positioning defects exhibited by dyn1 kip3 cells are caused, to a large extent, by the actions of kinesin- related Kip2p. Microtubules in kip2Δ cells were shorter and more sensitive to benomyl than wild-type, in contrast to the longer and benomyl-resistant microtubules found in dyn1Δ and kip3Δ cells. Most significantly, the deletion of KIP2 greatly suppressed the spindle localization defect and slow growth exhibited by dyn1 kip3 cells. Likewise, induced expression of KIP2 caused spindles to mislocalize in cells deficient for dynein and Kip3p. Our findings indicate that Kip2p participates in normal spindle positioning but antagonizes a positioning mechanism acting in dyn1 kip3 cells. The observation that deletion of KIP2 could also suppress the inviability of dyn1Δ kar3Δ cells suggests that kinesin-related Kar3p also contributes to spindle positioning.

Bibliography

Cottingham, F. R., & Hoyt, M. A. (1997). Mitotic Spindle Positioning in Saccharomyces cerevisiae Is Accomplished by Antagonistically Acting Microtubule Motor Proteins. The Journal of Cell Biology, 138(5), 1041â1053.

Authors 2

Frank R. Cottingham (first)
M. Andrew Hoyt (additional)

References 42 Referenced 203

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Dates

Type	When
Created	23 years, 1 month ago (July 26, 2002, 12:47 p.m.)
Deposited	2 years, 1 month ago (July 22, 2023, 3:10 a.m.)
Indexed	4 months, 2 weeks ago (April 11, 2025, 2:08 a.m.)
Issued	27 years, 11 months ago (Sept. 8, 1997)
Published	27 years, 11 months ago (Sept. 8, 1997)
Published Online	27 years, 11 months ago (Sept. 8, 1997)
Published Print	27 years, 11 months ago (Sept. 8, 1997)

Funders 0

None

BibTeX

@article{Cottingham_1997, title={Mitotic Spindle Positioning in Saccharomyces cerevisiae Is Accomplished by Antagonistically Acting Microtubule Motor Proteins}, volume={138}, ISSN={1540-8140}, url={http://dx.doi.org/10.1083/jcb.138.5.1041}, DOI={10.1083/jcb.138.5.1041}, number={5}, journal={The Journal of Cell Biology}, publisher={Rockefeller University Press}, author={Cottingham, Frank R. and Hoyt, M. Andrew}, year={1997}, month=sep, pages={1041–1053} }

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