Within the IPP (ILK-PINCH-PARVIN) complex, binds to F-actin, promoting F-actin bundling, a process required to generate force for actin cytoskeleton reorganization and subsequent dynamic cell adhesion events such as cell spreading and migration. . This is the function of LIMS1 (LIM zinc finger domain containing 1, Ensembl gene identifier ENSG00000169756).