Increases cell migration by inducing filopodia formation at the leading edge of migrating cells. Plays a role in regulation of apoptosis, possibly through control of CASP3. May be involved in a redox-related process (By similarity). Interacts with GPX1. Concentrates at the leading edge of migrating cells. Localizes outside membrane raft regions (By similarity). Isoprenylation facilitates association with the plasma membrane and enhances the migratory phenotype of cells by inducing increased filopodia formation. Belongs to the SelWTH family.