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- W294303609 abstract "The phosphomannosyl receptor mediates intracellular targeting of newly synthesized acid hydrolases to lysosomes, and is also expressed as a pinocytosis receptor on the cell surface of fibroblasts. We have purified the phosphomannosyl receptor from bovine liver and produced rabbit antibodies to the bovine receptor. The antibodies partially blocked pinocytosis of human spleen beta-glucuronidase by fibroblasts, a process mediated by the phosphomannosyl receptor. Affinity-purified antibodies to the phosphomannosyl receptor were used to study the biosynthesis and turnover of the receptor in human fibroblasts. Phosphomannosyl receptor immunoprecipitated after a 15 min pulse-labelling of fibroblasts with [35S]methionine exhibited an identical mobility on sodium dodecyl sulphate/polyacrylamide gels as purified bovine liver phosphomannosyl receptor. Pulse-chase experiments for up to 3 days provided no evidence for changes in molecular weight attributable to post-translational processing of the phosphomannosyl receptor. Turnover studies determined that the half-life of the phosphomannosyl receptor in normal human fibroblasts was 24-29 h. The half-life of the receptor was slightly longer (32 h) in I-cell disease fibroblasts and normal fibroblasts exposed to leupeptin (32 h), slightly shorter in fibroblasts exposed to NH4Cl (23 h) and saturating amounts of ligand (21 h) and unaffected in cells exposed to mannose 6-phosphate (24 h). These studies show that the turnover of the phosphomannosyl receptor in fibroblasts is very slow, in contrast with its rate of internalization in endocytosis, and that its rate of degradation is not greatly altered by a variety of agents that affect lysosomal protein turnover and/or receptor-mediated endocytosis. These results suggest that the degradative activities of the lysosomes do not play an important role in phosphomannosyl receptor turnover in cultured fibroblasts." @default.
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- W294303609 date "1983-08-15" @default.
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- W294303609 title "Biosynthesis and turnover of the phosphomannosyl receptor in human fibroblasts" @default.
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- W294303609 doi "https://doi.org/10.1042/bj2140353" @default.
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