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May play a key role in diverse functions ascribed to CD81 and CD9 such as oocytes fertilization or hepatitis C virus function. May regulate proliferation and differentiation of keratinocytes. May be a negative regulator of cell motility: suppresses T-cell mobility coordinately with CD81, associates with CD82 to suppress prostate cancer cell migration, regulates epidermoid cell reaggregation and motility on laminin-5 with CD9 and CD81 as key linkers. May also play a role on integrin-dependent morphology and motility functions. May participate in the regulation of neurite outgrowth and maintenance of the neural network in the adult brain.
Gene References into Functions
EWI-2 negatively regulates TGF-beta signaling and its downstream events including cytostasis (in vitro and in vivo), EMT-like changes, cell migration, CD271-dependent invasion, and lung metastasis (in vivo). PMID: 25656846
Authors demonstrated that EWI-2wint promotes CD81 clustering and confinement in CD81-enriched areas. PMID: 23351194
The EWI-2/alpha-actinin complex is involved in regulation of the actin cytoskeleton at T cell immune and virological synapses, providing a link between membrane microdomains and the formation of polarized membrane structures involved in T cell recognition. PMID: 22689882
analysis of interacting regions of CD81 and two of its partners, EWI-2 and EWI-2wint, and their effect on hepatitis C virus infection PMID: 21343309
EWI2/PGRL associates with the metastasis suppressor KAI1/CD82 and inhibits the migration of prostate cancer cells. PMID: 12750295
EWI-2-dependent reorganization of alpha4beta1-CD81 complexes on the cell surface is responsible for EWI-2 effects on integrin-dependent morphology and motility functions PMID: 15070678
EWI proteins EWI-2 and EWI-F, alpha3beta1 and alpha6beta4 integrins, and protein palmitoylation have contrasting effects on cell surface CD9 organization PMID: 16537545
EWI-2 and EWI-F link the tetraspanin web to the actin cytoskeleton through their direct association with ezrin-radixin-moesin proteins PMID: 16690612
Important functions of recently activated dendritic cells are thus critically modulated by the newly discovered HSPA8-EWI-2 interaction. PMID: 17785435
EWI-2 causes a substantial molecular reorganization of multiple molecules known to affect proliferation and/or invasion of astrocytes and/or glioblastomas. PMID: 19107234
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Subcellular Location
Cell membrane; Single-pass membrane protein.
Tissue Specificity
Expressed in brain, kidney, testis, liver and placenta with moderate expression in all other tissues. Detected on a majority of B-cells, T-cells, and natural killer cells but not on monocytes, polynuclear cells and platelets.