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© Therese Couderc, Marc Lecuit
Publication : Cell reports

Promotion and Suppression of Centriole Duplication Are Catalytically Coupled through PLK4 to Ensure Centriole Homeostasis

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Cell reports - 14 Jul 2016

Kim M, O'Rourke BP, Soni RK, Jallepalli PV, Hendrickson RC, Tsou MB

Link to Pubmed [PMID] – 27425613

Cell Rep 2016 08;16(5):1195-1203

PLK4 is the major kinase driving centriole duplication. Duplication occurs only once per cell cycle, forming one new (or daughter) centriole that is tightly engaged to the preexisting (or mother) centriole. Centriole engagement is known to block the reduplication of mother centrioles, but the molecular identity responsible for the block remains unclear. Here, we show that the centriolar cartwheel, the geometric scaffold for centriole assembly, forms the identity of daughter centrioles essential for the block, ceasing further duplication of the mother centriole to which it is engaged. To ensure a steady block, we found that the cartwheel requires constant maintenance by PLK4 through phosphorylation of the same substrate that drives centriole assembly, revealing a parsimonious control in which “assembly” and “block for new assembly” are linked through the same catalytic reaction to achieve homeostasis. Our results support a recently deduced model that the cartwheel-bound PLK4 directly suppresses centriole reduplication.

https://www.ncbi.nlm.nih.gov/pubmed/27425613