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Microtubule-motor activity of a yeast centromere-binding protein complex

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Abstract

DURING cell division, sister chromosomes segregate from each other on a microtubule-based structure called the mitotic spindle. Proteins bind to the centromere, a region of chromosomal DNA, to form the kinetochore, which mediates chromosome attachment to the mitotic spindle microtubules1,2. In the budding yeast Sac-charomyces cerevisiae, genetic analysis has shown that the 28-base-pair (bp) CDEIII region of the 125-bp centromere DNA sequence (CEN sequence) is the main region controlling chromosome segregation in vivo3,4. Therefore it is likely that proteins binding to the CDEIII region link the centromeres to the microtubules during mitosis. A complex of proteins (CBF3) that binds specifically to the CDEIII DNA sequence has been isolated by affinity chromatography5. Here we describe kinetochore function in vitro. The CBF3 complex can link DNA to microtubules, and the complex contains a minus-end-directed microtubule-based motor. We suggest that microtubule-based motors form the fundamental link between microtubules and chromosomes at mitosis.

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Authors and Affiliations

  1. Department of Pharmacology, University of California, San Francisco, California, 94143, USA

    A. A. Hyman & T. J. Mitchison

  2. Department of Biological Sciences, University of California, Santa Barbara, California, 93106, USA

    K. Middleton, M. Centola & J. Carbon

Authors
  1. A. A. Hyman
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  2. K. Middleton
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  3. M. Centola
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  4. T. J. Mitchison
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  5. J. Carbon
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Hyman, A., Middleton, K., Centola, M. et al. Microtubule-motor activity of a yeast centromere-binding protein complex. Nature 359, 533–536 (1992). https://doi.org/10.1038/359533a0

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  • DOI: https://doi.org/10.1038/359533a0

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