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The kinesin-14 Klp2 is negatively regulated by the SIN for proper spindle elongation and telophase nuclear positioning.

In Schizosaccharomyces pombe, a late mitotic kinase pathway called the septation initiation network (SIN) triggers cytokinesis. Here we show that the SIN is also involved in regulating anaphase spindle elongation and telophase nuclear positioning via inhibition of Klp2, a minus end-directed kinesin-14. Klp2 is known to localize to microtubules (MTs) and have roles in interphase nuclear positioning, mitotic chromosome alignment, and nuclear migration during karyogamy (nuclear fusion during mating). We observe SIN-dependent disappearance of Klp2 from MTs in anaphase, and we find that this is mediated by direct phosphorylation of Klp2 by the SIN kinase Sid2, which abrogates loading of Klp2 onto MTs by inhibiting its interaction with Mal3 (EB1 homologue). Disruption of Klp2 MT localization is required for efficient anaphase spindle elongation. Furthermore, when cytokinesis is delayed, SIN inhibition of Klp2 acts in concert with microtubules emanating from the equatorial microtubule-organizing center to position the nuclei away from the cell division site. These results reveal novel functions of the SIN in regulating the MT cytoskeleton and suggest that the SIN may have broader functions in regulating cellular organization in late mitosis than previously realized.

Pubmed ID: 23087209 RIS Download

Mesh terms: Anaphase | Cytokinesis | Microtubule-Associated Proteins | Microtubule-Organizing Center | Microtubules | Mitosis | Phosphorylation | Protein Kinases | Schizosaccharomyces | Schizosaccharomyces pombe Proteins | Signal Transduction | Spindle Apparatus | Telophase

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Associated grants

  • Agency: NIGMS NIH HHS, Id: R01 GM058406
  • Agency: NCI NIH HHS, Id: T32 CA119925
  • Agency: NCI NIH HHS, Id: T32CA119925
  • Agency: Howard Hughes Medical Institute, Id: GM058406-14
  • Agency: NIGMS NIH HHS, Id:

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Model organism database that provides organization of and access to scientific data for the fission yeast Schizosaccharomyces pombe. PomBase supports genomic sequence and features, genome-wide datasets and manual literature curation. PomBase also provides a community hub for researchers, providing genome statistics, a community curation interface, news, events, documentation, mailing lists, and welcomes data submissions.

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