Protein kinase D1 regulates cofilin-mediated F-actin reorganization and cell motility through slingshot
Open Access
- 29 March 2009
- journal article
- research article
- Published by Springer Science and Business Media LLC in Nature
- Vol. 11 (5), 545-556
- https://doi.org/10.1038/ncb1861
Abstract
The actin severing factor cofilin is activated by the slingshot phosphatases. Phosphorylation of slingshot 1L by protein kinase D is found to block the association of slingshot 1L with actin, thereby inhibiting cofilin activation and directed cell migration. Dynamic actin remodelling processes at the leading edge of migrating tumour cells are concerted events controlled by a fine-tuned temporal and spatial interplay of kinases and phosphatases. Actin severing is regulated by actin depolymerizing factor (ADF)/cofilin, which regulates stimulus-induced lamellipodia protrusion and directed cell motility. Cofilin is activated by dephosphorylation through phosphatases of the slingshot (SSH) family. SSH activity is strongly increased by its binding to filamentous actin (F-actin); however, other upstream regulators remain unknown. Here we show that in response to RhoA activation, protein kinase D1 (PKD1) phosphorylates the SSH enzyme SSH1L at a serine residue located in its actin-binding motif. This generates a 14-3-3-binding motif and blocks the localization of SSH1L to F-actin-rich structures in the lamellipodium by sequestering it in the cytoplasm. Consequently, expression of constitutively active PKD1 in invasive tumour cells enhanced the phosphorylation of cofilin and effectively blocked the formation of free actin-filament barbed ends and directed cell migration.Keywords
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