Non-catalytic role of phosphoinositide 3-kinase in mesenchymal cell migration through non-canonical induction of p85β/AP2-mediated endocytosis

Hideaki T. Matsubayashi (), Jack Mountain, Nozomi Takahashi, Abhijit Deb Roy, Tony Yao, Amy F. Peterson, Cristian Saez Gonzalez, Ibuki Kawamata and Takanari Inoue ()
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Hideaki T. Matsubayashi: Johns Hopkins University
Jack Mountain: Johns Hopkins University
Nozomi Takahashi: Tohoku University
Abhijit Deb Roy: Johns Hopkins University
Tony Yao: Johns Hopkins University
Amy F. Peterson: Johns Hopkins University
Cristian Saez Gonzalez: Johns Hopkins University
Ibuki Kawamata: Tohoku University
Takanari Inoue: Johns Hopkins University

Nature Communications, 2024, vol. 15, issue 1, 1-16

Abstract: Abstract Class IA phosphoinositide 3-kinase (PI3K) galvanizes fundamental cellular processes such as migration, proliferation, and differentiation. To enable these multifaceted roles, the catalytic subunit p110 utilizes the multi-domain, regulatory subunit p85 through its inter SH2 domain (iSH2). In cell migration, its product PI(3,4,5)P3 generates locomotive activity. While non-catalytic roles are also implicated, underlying mechanisms and their relationship to PI(3,4,5)P3 signaling remain elusive. Here, we report that a disordered region of iSH2 contains AP2 binding motifs which can trigger clathrin and dynamin-mediated endocytosis independent of PI3K catalytic activity. The AP2 binding motif mutants of p85 aberrantly accumulate at focal adhesions and increase both velocity and persistency in fibroblast migration. We thus propose the dual functionality of PI3K in the control of cell motility, catalytic and non-catalytic, arising distinctly from juxtaposed regions within iSH2.

Date: 2024
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DOI: 10.1038/s41467-024-46855-y

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