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Originally published as MBC in Press, 10.1091/mbc.E05-07-0644 on December 21, 2005

Vol. 17, Issue 3, 1085-1095, March 2006

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Ena/VASP Proteins Can Regulate Distinct Modes of Actin Organization at Cadherin-adhesive ContactsFormula Formula

Jeanie A. Scott * {dagger}, Annette M. Shewan *, Nicole R. den Elzen *, Joseph J. Loureiro {ddagger}, Frank B. Gertler {ddagger}, and Alpha S. Yap * {dagger}

* Division of Molecular Cell Biology, Institute for Molecular Bioscience, The University of Queensland, St. Lucia, Brisbane, Queensland, Australia 4072; {dagger} School for Biomedical Science, The University of Queensland, St. Lucia, Brisbane, Queensland, Australia 4072; and {ddagger} Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139

Submitted July 19, 2005; Revised October 26, 2005; Accepted December 5, 2005
Monitoring Editor: Richard Assoian

Functional interactions between classical cadherins and the actin cytoskeleton involve diverse actin activities, including filament nucleation, cross-linking, and bundling. In this report, we explored the capacity of Ena/VASP proteins to regulate the actin cytoskeleton at cadherin-adhesive contacts. We extended the observation that Ena/vasodilator-stimulated phosphoprotein (VASP) proteins localize at cell–cell contacts to demonstrate that E-cadherin homophilic ligation is sufficient to recruit Mena to adhesion sites. Ena/VASP activity was necessary both for F-actin accumulation and assembly at cell–cell contacts. Moreover, we identified two distinct pools of Mena within individual homophilic adhesions that cells made when they adhered to cadherin-coated substrata. These Mena pools localized with Arp2/3-driven cellular protrusions as well as at the tips of cadherin-based actin bundles. Importantly, Ena/VASP activity was necessary for both modes of actin activity to be expressed. Moreover, selective depletion of Ena/VASP proteins from the tips of cadherin-based bundles perturbed the bundles without affecting the protrusive F-actin pool. We propose that Ena/VASP proteins may serve as higher order regulators of the cytoskeleton at cadherin contacts through their ability to modulate distinct modes of actin organization at those contacts.


This article was published online ahead of print in MBC in Press (http://www.molbiolcell.org/cgi/doi/10.1091/mbc.E05–07–0644) on December 21, 2005.

Formula Formula The online version of this article contains supplemental material at MBC Online (http://www.molbiolcell.org).

Address correspondence to: Alpha S. Yap (a.yap{at}imb.uq.edu.au).




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