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Quantitative Immunofluorescence Assay to Measure the Variation in Protein Levels at Centrosomes
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DNA replication licensing factor Cdc6 and Plk4 kinase antagonistically regulate centrosome duplication via Sas-6
Xiaowei Xu1, Shijiao Huang1, Boyan Zhang1
1The MOE Key Laboratory of Cell Proliferation and Differentiation and the State Key Laboratory of Membrane Biology, College of Life Sciences, Peking University, Beijing 100871, China.
Nature Communications
|April 28, 2017
Summary
The DNA replication factor Cdc6 inhibits centrosome duplication by blocking Sas-6. However, Plk4 phosphorylates Cdc6, disrupting this inhibition and ensuring proper cell division.
Area of Science:
- Cell Biology
- Molecular Biology
- Genetics
Background:
- Centrosome duplication is critical for cell division, but the regulatory mechanisms are not fully understood.
- Maintaining correct centrosome number is essential for accurate spindle assembly and genomic stability.
Purpose of the Study:
- To elucidate the molecular mechanisms controlling centrosome duplication.
- To identify key proteins involved in regulating centrosome number during the cell cycle.
Main Methods:
- Co-immunoprecipitation assays to study protein interactions.
- Immunofluorescence microscopy to analyze protein localization.
- Overexpression studies of wild-type and mutant proteins.
Main Results:
- Cdc6 binds to Sas-6, inhibiting cartwheel formation and centrosome duplication.
- Cdc6 is recruited to centrioles via cyclin A.
- Plk4 phosphorylates Cdc6, disrupting the Cdc6-Sas-6 interaction and promoting duplication.
- Overexpression of Cdc6 or a non-phosphorylatable Cdc6 mutant reduces centrosome over-duplication.
Conclusions:
- Cdc6 acts as a negative regulator of centrosome duplication.
- Plk4 antagonizes Cdc6 activity through phosphorylation.
- Cdc6 and Plk4 form a regulatory axis controlling centrosome duplication during the cell cycle.
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