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Published online 21 April 2003. doi:10.1083/jcb.200208092
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© The Rockefeller University Press, 0021-9525/2003/4/281 $5.00
The Journal of Cell Biology, Volume 161, Number 2, 281-294


Article

The small molecule Hesperadin reveals a role for Aurora B in correcting kinetochore–microtubule attachment and in maintaining the spindle assembly checkpoint



Silke Hauf1, Richard W. Cole2, Sabrina LaTerra2, Christine Zimmer1, Gisela Schnapp3, Rainer Walter3, Armin Heckel3, Jacques van Meel4, Conly L. Rieder2 and Jan-Michael Peters1

1 Research Institute of Molecular Pathology, 1030 Vienna, Austria
2 Laboratory for Cell Regulation, Wadsworth Center for Laboratories and Research, Albany, NY 12201
3 Boehringer Ingelheim Pharma KG, 88397 Biberach/Riss, Germany
4 Boehringer Ingelheim Austria, 1121 Vienna, Austria

Address correspondence to Jan-Michael Peters, Research Institute of Molecular Pathology, Dr. Bohr-Gasse 7, 1030 Vienna, Austria. Tel.: 43-1-797-30-886. Fax: 43-1-798-71-53. E-mail: peters{at}imp.univie.ac.at

The proper segregation of sister chromatids in mitosis depends on bipolar attachment of all chromosomes to the mitotic spindle. We have identified the small molecule Hesperadin as an inhibitor of chromosome alignment and segregation. Our data imply that Hesperadin causes this phenotype by inhibiting the function of the mitotic kinase Aurora B. Mammalian cells treated with Hesperadin enter anaphase in the presence of numerous monooriented chromosomes, many of which may have both sister kinetochores attached to one spindle pole (syntelic attachment). Hesperadin also causes cells arrested by taxol or monastrol to enter anaphase within <1 h, whereas cells in nocodazole stay arrested for 3–5 h. Together, our data suggest that Aurora B is required to generate unattached kinetochores on monooriented chromosomes, which in turn could promote bipolar attachment as well as maintain checkpoint signaling.

Key Words: mitosis; chromosome segregation; kinetochores; spindle assembly checkpoint; chemical biology


The online version of this article includes supplemental material.

* Abbreviations used in this paper: APC, anaphase-promoting complex; NEB, nuclear envelope breakdown; RNAi, RNA interference; siRNA, small inhibitory RNA.


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