Borealin: a novel chromosomal passenger required for stability of the bipolar mitotic spindle

The Journal of Cell Biology
Reto GassmannWilliam C Earnshaw

Abstract

The chromosomal passenger complex of Aurora B kinase, INCENP, and Survivin has essential regulatory roles at centromeres and the central spindle in mitosis. Here, we describe Borealin, a novel member of the complex. Approximately half of Aurora B in mitotic cells is complexed with INCENP, Borealin, and Survivin; and Borealin binds Survivin and INCENP in vitro. A second complex contains Aurora B and INCENP, but no Borealin or Survivin. Depletion of Borealin by RNA interference delays mitotic progression and results in kinetochore-spindle misattachments and an increase in bipolar spindles associated with ectopic asters. The extra poles, which apparently form after chromosomes achieve a bipolar orientation, severely disrupt the partitioning of chromosomes in anaphase. Borealin depletion has little effect on histone H3 serine10 phosphorylation. These results implicate the chromosomal passenger holocomplex in the maintenance of spindle integrity and suggest that histone H3 serine10 phosphorylation is performed by an Aurora B-INCENP subcomplex.

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Citations

Sep 8, 2004·Chromosoma·Paola Vagnarelli, William C Earnshaw
Oct 21, 2010·Investigational New Drugs·Linda VidarsdottirJorunn Erla Eyfjord
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Methods Mentioned

BETA
nucleotide exchange
immunoprecipitation
fluorescence microscopy
transfection
GTPases
PCR

Software Mentioned

ImageQuant
SPTrEMBL

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