Serine phosphorylation site of the 46-kDa mannose 6-phosphate receptor is required for transport to the plasma membrane in Madin-Darby canine kidney and mouse fibroblast cells

P Breuer, C Korner, C Boker, A Herzog, R Pohlmann and T Braulke

Institute for Biochemistry II, Georg-August-Universitat Gottingen, Germany.

Up to 4% of the human 46-kDa mannose 6-phosphate receptor (MPR46) expressed in Madin-Darby canine kidney (MDCK) cells are localized at the cell surface. At steady state, the expression of MPR46 on the apical surface of filter-grown MDCK cells is about sixfold lower than on the basolateral surface. The cytoplasmic domain of the MPR46 is phosphorylated on serine 56 at low stoichiometry. By expressing mutant MPR46 we have shown that the MPR46 phosphorylation site is required for delivery to the plasma membrane. In addition, mutant MPR46 expressed in MPR-deficient mouse embryonic fibroblasts were not detected at the cell surface and their ability to sort newly synthesized cathepsin D was not altered. Since the loss of MPR46 phosphorylation correlates with the lack of cell surface expression, phosphorylation of serine 56 may either function as a direct plasma membrane targeting signal or inhibit MPR46 recycling from endosomes to Golgi, resulting in trafficking to the cell surface.

Volume 8, Issue 4, pp. 567-576, 04/01/1997
Copyright © 1997 by The American Society for Cell Biology

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