Inhibitors of Polo-like kinase reveal roles in spindle-pole maintenance - PubMed (original) (raw)
Comparative Study
doi: 10.1038/nchembio825. Epub 2006 Oct 8.
Aveek Mazumdar, Mokdad Mezna, Christopher Meades, Carol Midgley, Fred Scaerou, Lee Carpenter, Mairi Mackenzie, Paul Taylor, Malcolm Walkinshaw, Peter M Fischer, David Glover
Affiliations
- PMID: 17028581
- DOI: 10.1038/nchembio825
Comparative Study
Inhibitors of Polo-like kinase reveal roles in spindle-pole maintenance
Campbell McInnes et al. Nat Chem Biol. 2006 Nov.
Abstract
Polo-like kinases (Plks) have several functions in mitotic progression and are upregulated in many tumor types. Small-molecule Plk inhibitors would be valuable as tools for studying Plk biology and for developing antitumor agents. Guided by homology modeling of the Plk1 kinase domain, we have discovered a chemical series that shows potent and selective Plk1 inhibition. The effects of one such optimized benzthiazole N-oxide, cyclapolin 1 (1), on purified centrosomes indicate that Plks are required to generate MPM2 epitopes, recruit gamma-tubulin and enable nucleation of microtubules. The compound can also promote loss of centrosome integrity and microtubule nucleating ability apparently through increased accessibility of protein phosphatases. We show that treatment of living S2 cells with cyclapolin 1 leads to collapsed spindles, in contrast to the metaphase-arrested bipolar spindles observed after RNAi. This different response to protein depletion and protein inhibition may have significance in the development of antitumor agents.
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