The Dri 42 gene, whose expression is up-regulated during epithelial differentiation, encodes a novel endoplasmic reticulum resident transmembrane protein.

The Journal of Biological Chemistry
D BarilàG Perozzi

Abstract

A search for novel genes that are up-regulated during development and differentiation of the epithelial cells of the intestinal mucosa led us to the isolation of the Dri 42 cDNA clone (Dri, differentially expressed in rat intestine). The nucleotide sequence of the full-length cDNA has shown that it encodes a 35.5-kDa protein with one consensus sequence for N-linked glycosylation and alternating hydrophilic and hydrophobic domains. To determine the intracellular localization of Dri 42 we have raised polyclonal antibodies in hens against a bacterially produced Dri 42-glutathione S-transferase fusion protein. Immunofluorescence detection with these antibodies has shown specific staining of the endoplasmic reticulum (ER) in the relatively undifferentiated fetal rat intestinal cell line FRIC B and in sections of rat small intestine. ER membrane localization of Dri 42 was confirmed by laser confocal microscopy of polarized Madin-Darby canine kidney cells overexpressing a Dri 42-chloramphenicol acetyltransferase (CAT) fusion protein by transfection. Pulse labeling experiments on transiently transfected cells demonstrated that the protein does not acquire Golgi modifications up to 4 h after synthesis, thus indicating that Dri 42 is an ...Continue Reading

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