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Matriptase is a type II transmembrane serine protease. This protease is strongly expressed in simple epithelial cells such as enterocytes and kidney tubular cells in which the plasma membranes are separated into apical and basolateral domains. Although matriptase was found previously to occur exclusively on the basolateral membrane of enterocytes, the underlying mechanism of localization is unclear. In the present study, a full-length rat matriptase and a chimera consisting of the cytoplasmic and transmembrane regions of the protease and green fluorescent protein (designated as 1-86GFP) were found to localize exclusively to the basolateral membrane domain when expressed in Madin-Darby canine kidney epithelial cells. Mutagenesis analysis of 1-86GFP revealed that the matriptase cytoplasmic juxtamembrane amino acid residues (Lys45, Val47, and Arg50) play a role in mediating the localization in the cells. This study provides the first evidence that matriptase carries information for its localization in simple epithelia.

cytotechnology

Involvement of the cytoplasmic juxtamembrane region of matriptase in its exclusive localization to the basolateral membrane domain of Madin–Darby canine kidney epithelial cells