Polar expression of ErbB-2/HER2 in epithelia. Bimodal regulation by Lin-7 - PubMed (original) (raw)
Comparative Study
Polar expression of ErbB-2/HER2 in epithelia. Bimodal regulation by Lin-7
Maya Shelly et al. Dev Cell. 2003 Sep.
Free article
Abstract
ErbB-2/HER2 drives epithelial malignancies by forming heterodimers with growth factor receptors. The primordial invertebrate receptor is sorted to the basolateral epithelial surface by binding of the PDZ domain of Lin-7 to the receptor's tail. We show that all four human ErbBs are basolaterally expressed, even when the tail motif is absent. Mutagenesis of hLin-7 unveiled a second domain, KID, that binds to the kinase region of ErbBs. The PDZ interaction mediates stabilization of ErbB-2 at the basolateral surface. On the other hand, binding of KID is involved in initial delivery to the basolateral surface, and in its absence, unprocessed ErbB-2 molecules are diverted to the apical surface. Hence, distinct domains of Lin-7 regulate receptor delivery to and maintenance at the basolateral surface of epithelia.
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