Abstract
Here we show that suppression of synthesis of the microtubule motor CENP-E (centromere-associated protein E), a component of the kinetochore corona fibres of mammalian centromeres, yields chromosomes that are chronically mono-orientated, with spindles that are flattened along the plane of the substrate. Despite apparently normal microtubule numbers and the continued presence at kinetochores of other microtubule motors, spindle poles fragment in the absence of CENP-E, which implicates this protein in delivery of components from kinetochores to poles. CENP-E represents a link between attachment of spindle microtubules and the mitotic checkpoint signalling cascade, as depletion of this motor leads to profound checkpoint activation, whereas immunoprecipitation reveals a nearly stoichiometric association of CENP-E with the checkpoint kinase BubR1 during mitosis.
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Acknowledgements
This work was supported by a grant from the National Institute of Health (GM29513) to D.W.C. Salary support for D.W.C. is provided by the Ludwig Institute for Cancer Research. X.Y. was supported by postdoctoral fellowships from the Bank of America Giannini Foundation and the American Cancer Society (California Division), and by a Career Development Award from the Howard Hughes Medical Institute/University of Wisconsin.
Correspondence and requests for materials should be addressed to D.W.C.
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Yao, X., Abrieu, A., Zheng, Y. et al. CENP-E forms a link between attachment of spindle microtubules to kinetochores and the mitotic checkpoint. Nat Cell Biol 2, 484–491 (2000). https://doi.org/10.1038/35019518
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DOI: https://doi.org/10.1038/35019518
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