PTEN dephosphorylates Abi1 to promote epithelial morphogenesis.

ABSTRACT: The tumor suppressor PTEN is essential for early development. Its lipid phosphatase activity converts PIP3 to PIP2 and antagonizes the PI3K-Akt pathway. In this study, we demonstrate that PTEN's protein phosphatase activity is required for epiblast epithelial differentiation and polarization. This is accomplished by reconstitution of PTEN-null embryoid bodies with PTEN mutants that lack only PTEN's lipid phosphatase activity or both PTEN's lipid and protein phosphatase activities. Phosphotyrosine antibody immunoprecipitation and mass spectrometry were used to identify Abi1, a core component of the WASP-family verprolin homologous protein (WAVE) regulatory complex (WRC), as a new PTEN substrate. We demonstrate that PTEN dephosphorylation of Abi1 at Y213 and S216 results in Abi1 degradation

SUBMITTER: Qi Y 

PROVIDER: S-EPMC7480098 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature