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FEBS Lett. 2002 Oct 9;529(2-3):275-80.

The vasodilator-stimulated phosphoprotein promotes actin polymerisation through direct binding to monomeric actin.

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  • 1Cell Biology, Zoological Institute, Technical University of Braunschweig, Biocenter, Spielmannstrasse 7, D-38092 Braunschweig, Germany.

Abstract

The vasodilator-stimulated phosphoprotein (VASP) functions as a cellular regulator of actin dynamics. VASP may initialise actin polymerisation, suggesting a direct interaction with monomeric actin. The present study demonstrates that VASP directly binds to actin monomers and that complex formation depends on a conserved four amino acid motif in the EVH2 domain. Point mutations within this motif drastically weaken VASP/G-actin interactions, thereby abolishing any actin-nucleating activity of VASP. Additionally, actin nucleation was found to depend on VASP oligomerisation since VASP monomers fail to induce the formation of actin filaments. Phosphorylation negatively affects VASP/G-actin interactions preventing VASP-induced actin filament formation.

PMID:
12372613
[PubMed - indexed for MEDLINE]
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