SOSEKI proteins locally interpret global polarity cues and can influence cell division orientation to coordinate cell polarization relative to body axes. Homodimer (By similarity). Forms long polymer filaments with other SOKs proteins polymers crucial for polar localization and biological activity (PubMed:32004461). The DIX-like oligomerization domain is required for polymerization, edge localization and biological activity. 'Soseki' means cornerstone in Japanese. Belongs to the SOSEKI family.