ABL (ABL1 or ABL2) associated with the complex of ROBO1, SLIT2, and glypican-1 (GPC1) at the plasma membrane binds CAP (CAP1 or CAP2) and regulates its activity to inhibit net actin assembly. Studies of CAP homologs from yeast, Dictyostelium, mouse, pig, and human suggest that the C-terminal actin binding domain acts to sequester actin monomers to prevent actin polymerization (Wills et al. 2002).
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