Abstract
Members of the Mps1 protein kinase family have been implicated in the regulation of the kinetochore-mediated spindle assembly checkpoint in species ranging from yeast to man. However, conflicting data have been reported on the subcellular localization of vertebrate Mps1 kinases and their possible roles in centrosome duplication. Moreover, little is presently known about the regulation of Mps1 kinases during the cell cycle. Here, we have used immunofluorescence microscopy, immunoblotting and siRNA-mediated depletion of hMps1 to re-investigate the subcellular localization of this kinase. Our data confirm the kinetochore association of hMps1 but suggest that the centrosome staining produced by some anti-hMps1 antibodies could be due to cross-reactivity with other proteins. We also show that the kinetochore association of hMps1 is mediated by the amino-terminal, non-catalytic domain and specifically requires the presence of the Hec1/Ndc80-Nuf2 complex at the kinetochore. Finally, we have combined in vitro binding studies and kinase assays to explore the influence of microtubules on hMps1 activity. Our data indicate that the catalytic domain of hMps1 displays affinity for microtubules and that microtubule binding could contribute to the regulation of kinase activity.
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Abbreviations
- DAPI:
-
4′,6-Diamidino-2-phenylindole
- EGFP:
-
Enhanced green fluorescent protein
- Mab:
-
Monoclonal antibody
- MBP:
-
Myelin basic protein
- PBS:
-
Phosphate-buffered saline
- RT:
-
Room temperature
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Acknowledgements
We are particularly grateful to Drs. Emma Lees and Mark Winey for kindly providing the Ag3 antibody and the bacterial hMps1 expression plasmids, respectively. We also thank Drs. Martin-Lluesma, H.H.W. Silljé, and S. Taylor for providing additional antibodies and plasmids, and Dr. T.U. Mayer for a generous gift of polymerized microtubules. Finally, we thank Dr. R. Neef and T.A. Kufer for helpful discussions and advice. This work was supported by the Max Planck Society and the Fonds der Chemischen Industrie.
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Stucke, V.M., Baumann, C. & Nigg, E.A. Kinetochore localization and microtubule interaction of the human spindle checkpoint kinase Mps1. Chromosoma 113, 1–15 (2004). https://doi.org/10.1007/s00412-004-0288-2
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DOI: https://doi.org/10.1007/s00412-004-0288-2