期刊
DEVELOPMENTAL CELL
卷 20, 期 4, 页码 550-562出版社
CELL PRESS
DOI: 10.1016/j.devcel.2011.02.005
关键词
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资金
- NIH National Center for Research Resources (NCRR)
- C. elegans gene knock-out consortium
- JSPS
- EMBO [ALTF-667-2007]
- Oncosuisse [OCS KLS 02024-02-2007]
- ERC [AdG 233335]
- INSERM
- INSERM-AVENIR
- Grants-in-Aid for Scientific Research [23870032] Funding Source: KAKEN
Centrosome duplication occurs once per cell cycle and ensures that the two resulting centrosomes assemble a bipolar mitotic spindle. Centriole formation is fundamental for centrosome duplication. In Caenorhabditis elegans, the evolutionarily conserved proteins SPD-2, ZYG-1, SAS-6, SAS-5, and SAS-4 are essential for centriole formation, but how they function is not fully understood. Here, we demonstrate that Protein Phosphatase 2A (PP2A) is also critical for centriole formation in C. elegans embryos. We find that PP2A subunits genetically and physically interact with the SAS-5/SAS-6 complex. Furthermore, we show that PP2A-mediated dephosphorylation promotes centriolar targeting of SAS-5 and ensures SAS-6 delivery to the site of centriole assembly. We find that PP2A is similarly needed for the presence of HsSAS-6 at centrioles and for centriole formation in human cells. These findings lead us to propose that PP2A-mediated loading of SAS-6 proteins is critical at the onset of centriole formation.
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