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• W2001971083 abstract "Whether mitotic structures like the centrosome can self-organize from the regulated mobility of their dynamic protein components remains unclear. Here, we combine fluorescence spectroscopy and chemical genetics to study in living cells the diffusion of polo-like kinase 1 (PLK1), an enzyme critical for centrosome maturation at the onset of mitosis. The cytoplasmic diffusion of a functional EGFP-PLK1 fusion correlates inversely with known changes in its enzymatic activity during the cell cycle. Specific EGFP-PLK1 inhibition using chemical genetics enhances mobility, as do point mutations inactivating the polo-box or kinase domains responsible for substrate recognition and catalysis. Spatial mapping of EGFP-PLK1 diffusion across living cells, using raster image correlation spectroscopy and line scanning, detects regions of low mobility in centrosomes. These regions exhibit characteristics of increased transient recursive EGFP-PLK1 binding, distinct from the diffusion of stable EGFP-PLK1–containing complexes in the cytoplasm. Chemical genetic suppression of mitotic EGFP-PLK1 activity, even after centrosome maturation, causes defects in centrosome structure, which recover when activity is restored. Our findings imply that continuous PLK1 activity during mitosis maintains centrosome self-organization by a mechanism dependent on its reaction and diffusion, suggesting a model for the formation of stable mitotic structures using dynamic protein kinases." @default.
• W2001971083 created "2016-06-24" @default.
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• W2001971083 date "2011-05-16" @default.
• W2001971083 modified "2023-09-27" @default.
• W2001971083 title "Continuous polo-like kinase 1 activity regulates diffusion to maintain centrosome self-organization during mitosis" @default.
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• W2001971083 doi "https://doi.org/10.1073/pnas.1101112108" @default.
• W2001971083 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3107272" @default.
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• W2001971083 hasPublicationYear "2011" @default.
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