Proteomic analysis of integrin-associated complexes identifies RCC2 as a dual regulator of Rac1 and Arf6

Jonathan D Humphries, Adam Byron, Mark D. Bass, Sue E. Craig, John W. Pinney, David Knight, Martin J Humphries

Research output: Contribution to journalArticlepeer-review


The binding of integrin adhesion receptors to their extracellular matrix ligands controls cell morphology, movement, survival, and differentiation in various developmental, homeostatic, and disease processes. Here, we report a methodology to isolate complexes associated with integrin adhesion receptors, which, like other receptor-associated signaling complexes, have been refractory to proteomic analysis. Quantitative, comparative analyses of the proteomes of two receptor-ligand pairs, α4β1-vascular cell adhesion molecule-1 and α5β1-fibronectin, defined both core and receptor-specific components. Regulator of chromosome condensation-2 (RCC2) was detected in the α5β1-fibronectin signaling network at an intersection between the Rac1 and adenosine 5′-diphosphate ribosylation factor 6 (Arf6) subnetworks. RCC2 knockdown enhanced fibronectin-induced activation of both Rac1 and Arf6 and accelerated cell spreading, suggesting that RCC2 limits the signaling required for membrane protrusion and delivery. Dysregulation of Rac1 and Arf6 function by RCC2 knockdown also abolished persistent migration along fibronectin fibers, indicating a functional role for RCC2 in directional cell movement. This proteomicsworkflow now opens the way to further dissection and systems-level analyses of adhesion signaling. Copyright 2008 by the American Association for the Advancement of Science; all rights reserved.
Original languageEnglish
Pages (from-to)ra51
JournalScience Signaling
Issue number87
Publication statusPublished - 8 Sept 2009


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