Villin-1 (VIL1)

Epithelial cell-specific Ca(2+)-regulated actin- modifying protein that modulates the reorganization of microvillar actin filaments. Binds phosphatidylinositol 4,5-bisphosphate (PIP2) and lysophosphatidic acid (LPA); binds LPA with higher affinity than PIP2.

Binding to LPA increases its phosphorylation by SRC and inhibits all actin-modifying actions. Binding to PIP2 inhibits actin-capping and -severing actions but enhances actin-bundling activity.