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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Hieber, V. Distler, J. Jourdian, G. W. Sahagian, G. Schmickel, R. |
| Abstract | Bovine testicular beta-galactosidase (beta-D-galactoside galactohydrolase, EC 3.2.1.23) is rapidly and selectively assimilated by human skin fibroblasts. The assimilation of the enzyme is strongly inhibited by mannose 6-phosphate and by a glycoprotein fraction isolated from bovine testes (glycoprotein inhibitors). These results suggest that beta-galactosidase and the glycoprotein inhibitors have a common recognition marker that contains mannose 6-phosphate. The presence of mannose phosphate in the glycoprotein inhibitors was demonstrated by acid hydrolysis of the glycoproteins to liberate mannose phosphate followed by reduction with NaB(3)H(4) to give [(3)H]mannitol phosphate. The (3)H-labeled compound was identified by paper electrophoresis and by the release of [(3)H]mannitol on treatment with phosphatase. The [(3)H]mannitol phosphate was oxidized with periodate and the resulting phosphorylated fragment, on reduction with NaB(3)H(4), yielded [(3)H]ethylene glycol phosphate, indicating substitution of phosphate on carbon 6 of mannitol. Mannose 6-phosphate was also found in a major carbohydrate-containing fraction of peptides produced from the glycoprotein inhibitors by tryspin digestion. It was estimated that about 2% of the mannose residues were present as mannose 6-phosphate. Phosphorylated oligosaccharides were also identified in hydrolysates of the glycoprotein inhibitors. One, a disaccharide, was identified as alpha-(mannosyl-6-phosphate)-(1 --> 2)-mannose. These observations suggest that the recognition marker of beta-galactosidase contains alpha1,2-linked mannose 6-phosphate; terminal alpha1,2-linked mannose residues are known to occur in the high-mannose type oligosaccharides present on beta-galactosidase. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 9 |
| Volume Number | 76 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1979-01-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Fibroblasts Metabolism Galactosidases Glycoproteins Pharmacology Hexosephosphates Mannosephosphates Beta-Galactosidase Carrier Proteins Peptide Fragments Receptors, Drug Structure-Activity Relationship Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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