Molecular Determinants of αVβ5 Localization in Flat Clathrin Lattices - Role of αVβ5 in Cell Adhesion and Proliferation

Overview

Journal J Cell Sci

Specialty Cell Biology

Date 2022 May 9

PMID 35532004

Authors

Alba Zuidema

Wei Wang

Maaike Kreft

Onno B Bleijerveld

Liesbeth Hoekman

Jonas Aretz

Ralph T Bottcher

Reinhard Fassler

Arnoud Sonnenberg

Affiliations

Soon will be listed here.

Abstract

The vitronectin receptor integrin αVβ5 can reside in two distinct adhesion structures - focal adhesions (FAs) and flat clathrin lattices (FCLs). Here, we investigate the mechanism that regulates the subcellular distribution of β5 in keratinocytes and show that β5 has approximately 7- and 5-fold higher affinity for the clathrin adaptors ARH (also known as LDLRAP1) and Numb, respectively, than for the talin 1 (TLN1); all proteins that bind to the membrane-proximal NPxY motif of the β5 cytoplasmic domain. Using mass spectrometry, we identified β5 interactors, including the Rho GEFs p115Rho-GEF and GEF-H1 (also known as ARHGEF1 and ARHGEF2, respectively), and the serine protein kinase MARK2, depletion of which diminishes the clustering of β5 in FCLs. Replacement of two serine residues (S759 and S762) in the β5 cytoplasmic domain with phospho-mimetic glutamate residues causes a shift in the localization of β5 from FAs into FCLs without affecting the interactions with MARK2, p115Rho-GEF or GEF-H1. Instead, we demonstrate that changes in the actomyosin-based cellular contractility by ectopic expression of activated Rho or disruption of microtubules regulates β5 localization. Finally, we present evidence that β5 in either FAs or FCLs functions to promote adhesion to vitronectin, cell spreading, and proliferation.

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