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J. Biol. Chem., Vol. 280, Issue 31, 28653-28662, August 5, 2005
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Ena/VASP Proteins Enhance Actin Polymerization in the Presence of Barbed End Capping Proteins*
**
From the
Department of Biology, University of Virginia, Charlottesville, Virginia 22903, the Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, the ¶Department of Biochemistry, Dartmouth Medical School, Hanover, New Hampshire 03755, and the ||Cell Adhesion Program, The Burnham Institute, La Jolla, California 92037
Ena/VASP proteins influence the organization of actin filament networks within lamellipodia and filopodia of migrating cells and in actin comet tails. The molecular mechanisms by which Ena/VASP proteins control actin dynamics are unknown. We investigated how Ena/VASP proteins regulate actin polymerization at actin filament barbed ends in vitro in the presence and absence of barbed end capping proteins. Recombinant His-tagged VASP increased the rate of actin polymerization in the presence of the barbed end cappers, heterodimeric capping protein (CP), CapG, and gelsolin-actin complex. Profilin enhanced the ability of VASP to protect barbed ends from capping by CP, and this required interactions of profilin with G-actin and VASP. The VASP EVH2 domain was sufficient to protect barbed ends from capping, and the F-actin and G-actin binding motifs within EVH2 were required. Phosphorylation by protein kinase A at sites within the VASP EVH2 domain regulated anti-capping and F-actin bundling by VASP. We propose that Ena/VASP proteins associate at or near actin filament barbed ends, promote actin assembly, and restrict the access of barbed end capping proteins.
Received for publication, April 12, 2005 , and in revised form, May 31, 2005.
* This work was supported by the Jeffress Foundation and National Institutes of Health Grants GM067222 (to D. A. S) and GM055801 (to F. B. G). Electron microscopy and image analysis was supported by National Institutes of Health Glue Grant for Cell Migration U54 GM646346 (to D. H.). The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.
The on-line version of this article (available at http://www.jbc.org) contains Figs. S1-S3.
** To whom correspondence should be addressed: Dept. of Biology, University of Virginia, Charlottesville, VA 22903. Tel.: 434-243-5297; Fax: 434-982-5626; E-mail: das9w{at}virginia.edu.
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