The human kinesin Kif18A is a motile microtubule depolymerase essential for chromosome congression

Mayr, Monika; Hümmer, Stefan; Bormann, Jenny; Grüner, Tamara; Adio, Sarah; Woehlke, Günther; Mayer, Thomas U.

The human kinesin Kif18A is a motile microtubule depolymerase essential for chromosome congression

Dateien

mayr_140416.pdfGröße: 946.13 KBDownloads: 811

Datum

2007

Autor:innen

Mayr, Monika

Hümmer, Stefan

Bormann, Jenny

Grüner, Tamara

Adio, Sarah

Woehlke, Günther

Mayer, Thomas U.

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Biologie

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Current Biology. 2007, 17(6), pp. 488-498. ISSN 0960-9822. Available under: doi: 10.1016/j.cub.2007.02.036

Zusammenfassung

BACKGROUND:
The accurate alignment of chromosomes at the spindle equator is fundamental for the equal distribution of the genome in mitosis and thus for the genetic integrity of eukaryotes. Although it is well established that chromosome movements are coupled to microtubule dynamics, the underlying mechanism is not well understood.

RESULTS:
By combining RNAi-depletion experiments with in vitro biochemical assays, we demonstrate that the human kinesin Kif18A is a motile microtubule depolymerase essential for chromosome congression in mammalian tissue culture cells. We show that in vitro Kif18A is a slow plus-end-directed kinesin that possesses microtubule depolymerizing activity. Notably, Kif18A like its yeast ortholog Kip3p depolymerizes longer microtubules more quickly than shorter ones. In vivo, Kif18A accumulates in mitosis where it localizes close to the plus ends of kinetochore microtubules. The depletion of Kif18A induces aberrantly long mitotic spindles and loss of tension across sister kinetochores, resulting in the activation of the Mad2-dependent spindle-assembly checkpoint. Live-cell microscopy studies revealed that in Kif18A-depleted cells, chromosomes move at reduced speed and completely fail to align at the spindle equator.

CONCLUSIONS:
These studies identify Kif18A as a dual-functional kinesin and a key component of chromosome congression in mammalian cells.

Fachgebiet (DDC)

570 Biowissenschaften, Biologie

Schlagwörter

Kif18A, KInesin, Microtubule, Mitose, Chromosomenbande, Zellteilung, Mikrotubuli, Kinesin

Zitieren

ISO 690

MAYR, Monika, Stefan HÜMMER, Jenny BORMANN, Tamara GRÜNER, Sarah ADIO, Günther WOEHLKE, Thomas U. MAYER, 2007. The human kinesin Kif18A is a motile microtubule depolymerase essential for chromosome congression. In: Current Biology. 2007, 17(6), pp. 488-498. ISSN 0960-9822. Available under: doi: 10.1016/j.cub.2007.02.036

BibTex

@article{Mayr2007-03-20human-14041,
  year={2007},
  doi={10.1016/j.cub.2007.02.036},
  title={The human kinesin Kif18A is a motile microtubule depolymerase essential for chromosome congression},
  number={6},
  volume={17},
  issn={0960-9822},
  journal={Current Biology},
  pages={488--498},
  author={Mayr, Monika and Hümmer, Stefan and Bormann, Jenny and Grüner, Tamara and Adio, Sarah and Woehlke, Günther and Mayer, Thomas U.}
}

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    <dcterms:abstract xml:lang="eng">BACKGROUND:&lt;br /&gt;The accurate alignment of chromosomes at the spindle equator is fundamental for the equal distribution of the genome in mitosis and thus for the genetic integrity of eukaryotes. Although it is well established that chromosome movements are coupled to microtubule dynamics, the underlying mechanism is not well understood.&lt;br /&gt;&lt;br /&gt;RESULTS:&lt;br /&gt;By combining RNAi-depletion experiments with in vitro biochemical assays, we demonstrate that the human kinesin Kif18A is a motile microtubule depolymerase essential for chromosome congression in mammalian tissue culture cells. We show that in vitro Kif18A is a slow plus-end-directed kinesin that possesses microtubule depolymerizing activity. Notably, Kif18A like its yeast ortholog Kip3p depolymerizes longer microtubules more quickly than shorter ones. In vivo, Kif18A accumulates in mitosis where it localizes close to the plus ends of kinetochore microtubules. The depletion of Kif18A induces aberrantly long mitotic spindles and loss of tension across sister kinetochores, resulting in the activation of the Mad2-dependent spindle-assembly checkpoint. Live-cell microscopy studies revealed that in Kif18A-depleted cells, chromosomes move at reduced speed and completely fail to align at the spindle equator.&lt;br /&gt;&lt;br /&gt;CONCLUSIONS:&lt;br /&gt;These studies identify Kif18A as a dual-functional kinesin and a key component of chromosome congression in mammalian cells.</dcterms:abstract>
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Universitätsbibliographie

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