Integrin alpha-6/beta-4 is a receptor for laminin. Plays a critical structural role in the hemidesmosome of epithelial cells. Is required for the regulation of keratinocyte polarity and motility. ITGA6:ITGB4 binds to NRG1 (via EGF domain) and this binding is essential for NRG1-ERBB signaling . ITGA6:ITGB4 binds to IGF1 and this binding is essential for IGF1 signaling . ITGA6:ITGB4 binds to IGF2 and this binding is essential for IGF2 signaling .
Subcellular locations: Cell membrane, Cell membrane, Cell junction, Hemidesmosome
Colocalizes with DST at the leading edge of migrating keratinocytes.
Integrin alpha-6/beta-4 is predominantly expressed by epithelia. Isoform beta-4D is also expressed in colon and placenta. Isoform beta-4E is also expressed in epidermis, lung, duodenum, heart, spleen and stomach.