Mechanism of membrane anchoring affects polarized expression of two proteins in MDCK cells - PubMed (original) (raw)
. 1989 Sep 29;245(4925):1499-501.
doi: 10.1126/science.2571189.
Affiliations
- PMID: 2571189
- DOI: 10.1126/science.2571189
Mechanism of membrane anchoring affects polarized expression of two proteins in MDCK cells
D A Brown et al. Science. 1989.
Abstract
The signals that direct membrane proteins to the apical or basolateral plasma membrane domains of polarized epithelial cells are not known. Several of the class of proteins anchored in the membrane by glycosyl-phosphatidylinositol (GPI) are expressed on the apical surface of such cells. However, it is not known whether the mechanism of membrane anchorage or the polypeptide sequence provides the sorting information. The conversion of the normally basolateral vesicular stomatitis virus glycoprotein (VSV G) to a GPI-anchored protein led to its apical expression. Conversely, replacement of the GPI anchor of placental alkaline phosphatase with the transmembrane and cytoplasmic domains of VSV G shifted its expression from the apical to the basolateral surface. Thus, the mechanism of membrane anchorage can determine the sorting of proteins to the apical or basolateral surface, and the GPI anchor itself may provide an apical transport signal.
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