Two V motifs of N-WASP VCA are required for its full activity.
(A) Schematic structures of N-WASP MV1, MV2, and MVD
VCAs. (B) The effect of mutation in V motif on actin
polymerization. Actin polymerization was followed in the presence of
MV1, MV2, or MVD VCAs (100 nM). (C) The ability of MV1,
MV2, and MVD VCAs to bind G-actin and Arp2/3 complex. MV1, MV2, and
MVD VCAs were immobilized on beads and incubated with G-actin or
Arp2/3 complex. Bound proteins were analyzed by Western blotting.