Critical role in assembling adherens junctions; adapter protein involved in polarizing protein trafficking in epithelial cells. Necessary to maintain, not establish, the entire terminal web (organelle-depleted, intermediate filament-rich layer of cytoplasm that underlies the apical microvilli of polarized epithelial cells) or brush border assembly at the apical surface gut cells. Required for correct localization of ifb-2 intermediate filaments in the terminal web. Required for dlg-1 lateral localization (PubMed:18411252). With dlg-1, cooperatively regulates ajm-1 localization to apical junctions (PubMed:11715019). Basolateral membrane of epithelial cells. Expressed in the terminal web of the intestine (PubMed:15063180, PubMed:27506200). Expressed in seam cells (PubMed:27506200). Expressed in all embryonic epithelial cells. Worms display a severely affected epithelial integrity, leading to abnormal morphogenesis of the pharynx, intestine and embryo. Belongs to the LAP (LRR and PDZ) protein family.