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Systems analysis of RhoGEF and RhoGAP regulatory proteins reveals spatially organized RAC1 signalling from integrin adhesions

Item Type:Article
Title:Systems analysis of RhoGEF and RhoGAP regulatory proteins reveals spatially organized RAC1 signalling from integrin adhesions
Creators Name:Müller, P.M. and Rademacher, J. and Bagshaw, R.D. and Wortmann, C. and Barth, C. and van Unen, J. and Alp, K.M. and Giudice, G. and Eccles, R.L. and Heinrich, L.E. and Pascual-Vargas, P. and Sanchez-Castro, M. and Brandenburg, L. and Mbamalu, G. and Tucholska, M. and Spatt, L. and Czajkowski, M.T. and Welke, R.W. and Zhang, S. and Nguyen, V. and Rrustemi, T. and Trnka, P. and Freitag, K. and Larsen, B. and Popp, O. and Mertins, P. and Gingras, A.C. and Roth, F.P. and Colwill, K. and Bakal, C. and Pertz, O. and Pawson, T. and Petsalaki, E. and Rocks, O.
Abstract:Rho GTPases are central regulators of the cytoskeleton and, in humans, are controlled by 145 multidomain guanine nucleotide exchange factors (RhoGEFs) and GTPase-activating proteins (RhoGAPs). How Rho signalling patterns are established in dynamic cell spaces to control cellular morphogenesis is unclear. Through a family-wide characterization of substrate specificities, interactomes and localization, we reveal at the systems level how RhoGEFs and RhoGAPs contextualize and spatiotemporally control Rho signalling. These proteins are widely autoinhibited to allow local regulation, form complexes to jointly coordinate their networks and provide positional information for signalling. RhoGAPs are more promiscuous than RhoGEFs to confine Rho activity gradients. Our resource enabled us to uncover a multi-RhoGEF complex downstream of G-protein-coupled receptors controlling CDC42-RHOA crosstalk. Moreover, we show that integrin adhesions spatially segregate GEFs and GAPs to shape RAC1 activity zones in response to mechanical cues. This mechanism controls the protrusion and contraction dynamics fundamental to cell motility. Our systems analysis of Rho regulators is key to revealing emergent organization principles of Rho signalling.
Source:Nature Cell Biology
ISSN:1465-7392
Publisher:Nature Publishing Group
Date:23 March 2020
Official Publication:https://doi.org/10.1038/s41556-020-0488-x
PubMed:View item in PubMed

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