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Published 28 April 2003. doi:10.1083/jcb.200211097
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© The Rockefeller University Press, 0021-9525/2003/4/359 $5.00
The Journal of Cell Biology, Volume 161, Number 2, 359-369


Article

Stu2p, the budding yeast member of the conserved Dis1/XMAP215 family of microtubule-associated proteins is a plus end–binding microtubule destabilizer

Mark van Breugel, David Drechsel and Anthony Hyman

Max Planck Institute of Molecular Cell Biology and Genetics, 01307 Dresden, Germany

Address correspondence to Anthony Hyman, Max Planck Institute of Molecular Cell Biology and Genetics, Pfotenhauerstrasse 108, 01307 Dresden, Germany. Tel.: 49-351-210-1280. Fax: 49-351-210-1289. E-mail: hyman{at}mpi-cbg.de

The Dis1/XMAP215 family of microtubule-associated proteins conserved from yeast to mammals is essential for cell division. XMAP215, the Xenopus member of this family, has been shown to stabilize microtubules in vitro, but other members of this family have not been biochemically characterized. Here we investigate the properties of the Saccharomyces cerevisiae homologue Stu2p in vitro. Surprisingly, Stu2p is a microtubule destabilizer that binds preferentially to microtubule plus ends. Quantitative analysis of microtubule dynamics suggests that Stu2p induces microtubule catastrophes by sterically interfering with tubulin addition to microtubule ends. These results reveal both a new biochemical activity for a Dis1/XMAP215 family member and a novel mechanism for microtubule destabilization.

Key Words: microtubule; dynamics; assembly; XMAP215; Dis1


The online version of this article includes supplemental material.

* Abbreviations used in this paper: HU, hydroxyurea; VE-DIC, video-enhanced differential interference contrast microscopy.


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