The bipolar spindle is a highly dynamic structure that assembles transiently around the chromosomes and provides the mechanical support and the forces required for chromosome segregation. Spindle assembly and chromosome movements rely on the regulation of microtubule dynamics and a fine balance of forces exerted by various molecular motors. Chromosomes are themselves central players in spindle assembly. They generate a RanGTP gradient that triggers microtubule nucleation and stabilization locally and they interact dynamically with the microtubules through motors targeted to the chromatin. We have previously identified and characterized two of these so-called chromokinesins: Xkid (kinesin 10) and Xklp1 (kinesin 4). More recently, we found that Hklp2/kif15 (kinesin 12) is targeted to the chromosomes through an interaction with Ki-67 in human cells and is therefore a novel chromokinesin. Hklp2 also associates with the microtubules specifically during mitosis, in a TPX2 (targeting protein for Xklp2)-dependent manner. We have shown that Hklp2 participates in spindle pole separation and in the maintenance of spindle bipolarity in metaphase. To better understand the function of Hklp2, we have performed a detailed domain analysis. Interestingly, from its positioning on the chromosome arms, Hklp2 seems to restrict spindle pole separation. In the present review, we summarize the current knowledge of the function and regulation of the different kinesins associated with chromosome arms during cell division, including Hklp2 as a novel member of this so-called chromokinesin family.
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Conference Article|
September 21 2011
Chromokinesins: localization-dependent functions and regulation during cell division
David Vanneste;
David Vanneste
*Cell and Developmental Biology Program, Centre for Genomic Regulation (CRG) and Universitat Pompeu Fabra (UPF), Barcelona, Spain
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Vanessa Ferreira;
Vanessa Ferreira
*Cell and Developmental Biology Program, Centre for Genomic Regulation (CRG) and Universitat Pompeu Fabra (UPF), Barcelona, Spain
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Isabelle Vernos
Isabelle Vernos
1
*Cell and Developmental Biology Program, Centre for Genomic Regulation (CRG) and Universitat Pompeu Fabra (UPF), Barcelona, Spain
†Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Spain
1To whom correspondence should be addressed (email isabelle.vernos@crg.eu).
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Publisher: Portland Press Ltd
Received:
April 04 2011
Online ISSN: 1470-8752
Print ISSN: 0300-5127
© The Authors Journal compilation © 2011 Biochemical Society
2011
Biochem Soc Trans (2011) 39 (5): 1154–1160.
Article history
Received:
April 04 2011
Citation
David Vanneste, Vanessa Ferreira, Isabelle Vernos; Chromokinesins: localization-dependent functions and regulation during cell division. Biochem Soc Trans 1 October 2011; 39 (5): 1154–1160. doi: https://doi.org/10.1042/BST0391154
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