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WAVE binds Ena/VASP for enhanced Arp2/3 complex-based actin assembly
Svitlana Havrylenko1, Philippe Noguera1, Majdouline Abou-Ghali1
1Institut Curie, Centre de Recherche Centre National de la Recherche Scientifique, Unité Mixte de Recherche 168 Université Pierre et Marie Curie, Paris F-75248, France.
Molecular Biology of the Cell
|October 31, 2014
Summary
The WAVE complex directly binds Ena/VASP proteins, enhancing Arp2/3 complex-mediated actin assembly crucial for cell movement and lamellipodia formation.
Area of Science:
- Cell Biology
- Biochemistry
- Developmental Biology
Background:
- The WAVE complex activates the Arp2/3 complex for actin nucleation in lamellipodia.
- Ena/VASP proteins promote actin filament elongation, contributing to cell protrusion.
Purpose of the Study:
- To investigate the molecular coordination between WAVE and Ena/VASP proteins in actin network formation.
- To understand how these proteins collectively regulate lamellipodia dynamics.
Main Methods:
- In vitro bead motility assay to study protein interactions and actin assembly.
- In vivo studies during Caenorhabditis elegans embryogenesis to assess lamellipodia formation.
Main Results:
- WAVE directly binds VASP, leading to increased Arp2/3 complex-based actin assembly.
- This interaction is essential for lamellipodia formation during C. elegans ventral enclosure.
- Ena/VASP binding to F-actin and profilin-G-actin is critical, but tetramerization is not required.
Conclusions:
- Ena/VASP binding to WAVE potentiates Arp2/3 complex activity.
- This coordinated action promotes efficient lamellipodial actin assembly and cell motility.
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