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; Takanari Inoue

doi:10.1038/s41467-024-46855-y

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

Nat Commun. 2024 Mar 23;15(1):2612. doi: 10.1038/s41467-024-46855-y.

Authors

Hideaki T Matsubayashi^{1

2

3}, Jack Mountain^{4

5}, Nozomi Takahashi⁶, Abhijit Deb Roy^{4

5}, Tony Yao^{4

5}, Amy F Peterson^{4

5}, Cristian Saez Gonzalez^{4

5}, Ibuki Kawamata^{7

8

9}, Takanari Inoue^{10

11}

Affiliations

¹ Department of Cell Biology, School of Medicine, Johns Hopkins University, Baltimore, MD, USA. [email protected].
² Center for Cell Dynamics, Institute of Basic Biomedical Sciences, Johns Hopkins University, Baltimore, MD, USA. [email protected].
³ Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Tohoku, Japan. [email protected].
⁴ Department of Cell Biology, School of Medicine, Johns Hopkins University, Baltimore, MD, USA.
⁵ Center for Cell Dynamics, Institute of Basic Biomedical Sciences, Johns Hopkins University, Baltimore, MD, USA.
⁶ Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Tohoku, Japan.
⁷ Department of Robotics, Tohoku University, Tohoku, Japan.
⁸ Natural Science Division, Ochanomizu University, Kyoto, Japan.
⁹ Graduate School of Science, Kyoto University, Kyoto, Japan.
¹⁰ Department of Cell Biology, School of Medicine, Johns Hopkins University, Baltimore, MD, USA. [email protected].
¹¹ Center for Cell Dynamics, Institute of Basic Biomedical Sciences, Johns Hopkins University, Baltimore, MD, USA. [email protected].

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.

MeSH terms

Cell Movement
Endocytosis
Phosphatidylinositol 3-Kinase* / metabolism
Phosphatidylinositol 3-Kinases* / metabolism
src Homology Domains

Substances

Phosphatidylinositol 3-Kinase
Phosphatidylinositol 3-Kinases

Abstract

MeSH terms

Substances

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