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Newly synthesized lysosomal enzymes acquire phosphomannosyl units, which allow binding of the enzymes to the mannose 6-phosphate receptor and subsequent translocation to lysosomes. In some cell types, this sequence of events is necessary for the delivery of these enzymes to lysosomes. Using a slime mold lysosomal hydrolase as a probe, we have identified three murine cell lines that lack the receptor and one line that contains very low (3%) receptor activity. Each of these lines synthesizes the mannose 6-phosphate recognition marker on its lysosomal enzymes, but, unlike cell lines with high levels of receptor, the cells accumulate oligosaccharides containing phosphomonoesters. The receptor-deficient lines possess high levels of intracellular acid hydrolase activity, which is contained in dense granules characteristic of lysosomes. The data suggest that intracellular mechanisms independent of the mannose 6-phosphate receptor must exist in some cells for the delivery of acid hydrolases to lysosomal organelles.

proceedings of the national academy of sciences of the united states of america

Identification and characterization of cells deficient in the mannose 6-phosphate receptor: evidence for an alternate pathway for lysosomal enzyme targeting.