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A new chromosomal protein essential for mitotic spindle assembly

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A Corrigendum to this article was published on 14 August 1997

Abstract

ASSEMBLY of the mitotic spindle, the machinery responsible for chromosomal segregation, is regulated by Cdc2 kinase1–5 and requires mitotic chromatin5–8. However, the molecular identity of the kinase substrate and chromatin factor is unknown. Here we have cloned a human complementary DNA encoding an evolution-arily conserved chromosomal protein of relative molecular mass 47,000 (Mr 47K) which has three consensus motifs for Cdc2 kinase-mediated phosphorylation9. The protein is phosphorylated only during mitosis and is associated with polypeptides having Mrs of 31K, 67K and 200K. Mitotic arrest is induced by antisense messenger RNA or by affinity-purified autoantibody. In the arrested cells, the chromosomes remain unsegregated and the mitotic spindle is absent. We propose that the chromosomal protein is activated by phosphorylation at the interphase/mitosis transition by Cdc2 kinase, and that the protein, alone or as a complex, is a previously unidentified Cdc2 kinase substrate and chromatin factor necessary for spindle assembly.

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Authors and Affiliations

  1. Department of Pathology and Immunology, Monash University Medical School, Melbourne, Victoria, 3181, Australia

    Jing-Ping Yeo, Frank Alderuccio & Ban-Hock Teh

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  1. Jing-Ping Yeo
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  2. Frank Alderuccio
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  3. Ban-Hock Teh
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Yeo, JP., Alderuccio, F. & Teh, BH. A new chromosomal protein essential for mitotic spindle assembly. Nature 367, 288–291 (1994). https://doi.org/10.1038/367288a0

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