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. 1981 Jul;78(7):4289–4293. doi: 10.1073/pnas.78.7.4289

Characterization of a membrane-associated receptor from bovine liver that binds phosphomannosyl residues of bovine testicular beta-galactosidase.

G G Sahagian, J Distler, G W Jourdian
PMCID: PMC319775  PMID: 6270668

Abstract

A receptor that binds the phosphomannosyl recognition marker of bovine testicular beta-galactosidase (beta-D-galactoside galactohydrolase, EC 3.2.1.23) was isolated from bovine liver membranes. The receptor was extracted from crude plasma membrane preparations with Triton X-100 and immunoprecipitated as a receptor--beta-galactosidase complex with anti-beta-galactosidase. The receptor was dissociated from the precipitate with mannose 6-phosphate, labeled with 125I, and purified on a beta-galactosidase-Sepharose 4B affinity matrix. A quantitative binding assay employing anti-beta-galactosidase and IgGsorb (formalin-fixed Staphylococcus aureus) was devised to study the binding of 125I-labeled receptor to beta-galactosidase. Maximal binding of receptor to enzyme occurred at pH values between 5.7 and 6.5. Divalent cations were not required for binding. The values of the dissociation constant obtained for beta-galactosidase varied between 200 nM observed with "lower uptake" forms and 20 nM for "higher uptake" forms of the enzyme. A number of phosphorylated monosaccharides were tested as inhibitors of binding of enzyme to receptor; mannose 6-phosphate and fructose 1-phosphate served as inhibitors and exhibited Ki values of 0.064 mM and 0.24 mM, respectively. The receptor has a subunit molecular weight of 215,000. Similar receptors were also demonstrated in Triton X-100 extracts of human skin fibroblasts, Chinese hamster ovary cells, and rat hepatocytes. These cell types are known to assimilate lysosomal enzymes containing covalently bound mannose 6-phosphate residues.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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