Scaffold protein involved in different aspects of polarized cell differentiation regulating epithelial and neuronal morphogenesis and T-cell polarization (PubMed:15182672, PubMed:16344308, PubMed:19041750, PubMed:18716323, PubMed:18641685, PubMed:16965391, PubMed:27380321). Via its interaction with CRTAM, required for the late phase polarization of a subset of CD4+ T-cells, which in turn regulates TCR-mediated proliferation and IFNG and IL22 production (By similarity). Most probably functions in the establishment of apico-basal cell polarity (PubMed:16344308, PubMed:19041750). May function in cell proliferation regulating progression from G1 to S phase and as a positive regulator of apoptosis for instance during acinar morphogenesis of the mammary epithelium (PubMed:16965391, PubMed:19041750). May also function in cell migration and adhesion and hence regulate cell invasion through MAPK signaling (PubMed:18716323, PubMed:18641685). May play a role in exocytosis and in the targeting of synaptic vesicles to synapses (PubMed:15182672). Functions as an activator of Rac GTPase activity. Interacts with UBE3A (PubMed:11027293). Interacts with PAK1 and PAK2 (PubMed:18716323). Interacts (via PDZ domains) with VANGL2 (By similarity). Interacts (via PDZ domains) with LPP and TRIP6; the interaction is direct (PubMed:15649318, PubMed:16137684). Interacts (via PDZ domains) with TJP2 (PubMed:15975580). Interacts (via PDZ domains) with APC; may mediate APC targeting to adherens junctions of epithelial cells (PubMed:16611247). Interacts (via PDZ domains) with TSHR; regulates TSHR trafficking and function (PubMed:15775968). Interacts with ARHGEF7 and GIT1; interacts directly with ARHGEF7 (PubMed:15182672). Interacts with CTNNB1 (By similarity). Interacts with MAPK12 (By similarity). Interacts (via PDZ domains 1 and 3) with MCC (PubMed:19555689, PubMed:22480440). Interacts with DLG5 (PubMed:28169360). Interacts with STK4/MST1 and LATS1 in the presence of DLG5 (PubMed:28169360). Interacts (via PDZ domain 3) with CRTAM (via PDZ-binding motif); the interaction promotes CRTAM and SCRIB polarization in a subset of CD4+ T-cells (By similarity). (Microbial infection) Interacts (via fourth PDZ domain) with tick-borne encephalitis virus RNA-directed RNA polymerase NS5; this interaction targets viral NS5 to the cell membrane periphery and nucleus and prevents STAT1 phosphorylation, and thus, the activation of the JAK-STAT signaling pathway (PubMed:18042258). Interacts with HPV E6 (PubMed:11027293). Targeting to cell-cell junctions which is CDH1-dependent is required for the pro-apoptotic activity. In a subset of CD4+ T-cells, colocalizes with CRTAM at the immunological synapse during the late phase of T-cell activation (By similarity). Expressed in kidney, skeletal muscles, liver, lung, breast, intestine, placenta and skin mainly in epithelial cells (at protein level). Ubiquitinated; targeted for UBE3A-dependent multiubiquitination in the presence of high-risk HPV E6 proteins and degraded. Palmitoylated (PubMed:27380321). Could be depalmitoylated by LYPLA1 and/or LYPLA2 (PubMed:27380321). Palmitoylation of SCRIB by ZDHHC7 is required for its localization to cell-cell junctions, function in the establishement of epithelial cell polarity and the regulation of downstream signaling pathways important for epithelial cell differentiation (PubMed:27380321). The disease is caused by variants affecting the gene represented in this entry. Belongs to the LAP (LRR and PDZ) protein family.