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Synthesis of the cation-dependent mannose 6-phosphate-specific receptor was followed in cells of human (fibroblasts, Hep G2 cells, U937 monocytes, blood-derived macrophages) or rat (Morris hepatoma 7777 cells) origin. The mature form of the receptor has an apparent molecular size of 46 kDa except in fibroblasts, where the apparent molecular size was 43 kDa. The receptor contains 7-8 N-linked oligosaccharide chains, about 5 of which are converted into endo H-resistant forms within 2 h of synthesis. A small fraction of the receptor (about 3% of total in U937 monocytes) is located at the cell surface while the bulk of the receptor resides in internal membranes. Part of the internal receptors (20% in fibroblasts) resides in membranes of the endocytic pathway. The receptor was not detectable in dense lysosomes. The receptor is a hydrophobic transmembrane protein partitioning with Triton X-114. The cytosolic portion of the receptor comprises a molecular size of about 5 kDa and contains the C-terminus. The luminal (or external) portion of the receptor comprises a molecular size of greater than or equal to 37.5 kDa, of which more than half is represented by carbohydrate. Cross-linking experiments suggest that the mature receptor exists in membranes as a dimer.

46-kDa Mannose 6-phosphate-Specific Receptor: Biosynthesis, Processing, Subcellular Location and Topology