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To determine the mechanism by which N-WASp mediates activation by Cdc42, actin
polymerization was measured in the presence of purified components. In the presence of the
Arp2/3 complex (ARP), N-WASp stimulates actin polymerization substantially over ARP or N-
WASp alone, but not nearly so dramatically as the C-terminal segment of N-WASp that contains
just the verprolin (V), cofilin (C), and acidic (A) domains (VCA) (Panel A Below). To account
for the difference between N-WASp and its C-terminal VCA segment, N-WASp and ARP were
mixed with combinations of Cdc42-GTPS and vesicles containing PIP2 [PI(4,5)P2] (Panel B
Below).
What is required for full-length N-WASp to stimulate actin polymerization as efficiently as its C-
terminal VCA segment? Explain your reasoning.

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  • 1. To determine the mechanism by which N-WASp mediates activation by Cdc42, actin polymerization was measured in the presence of purified components. In the presence of the Arp2/3 complex (ARP), N-WASp stimulates actin polymerization substantially over ARP or N- WASp alone, but not nearly so dramatically as the C-terminal segment of N-WASp that contains just the verprolin (V), cofilin (C), and acidic (A) domains (VCA) (Panel A Below). To account for the difference between N-WASp and its C-terminal VCA segment, N-WASp and ARP were mixed with combinations of Cdc42-GTPS and vesicles containing PIP2 [PI(4,5)P2] (Panel B Below). What is required for full-length N-WASp to stimulate actin polymerization as efficiently as its C- terminal VCA segment? Explain your reasoning.