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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Urushizaki, Y. Seifter, S. |
| Abstract | O5-Phosphohydroxylysine was chemically synthesized and techniques were established for its identification by combined use of cation-exchange chromatography, thin-layer electrophoresis at pH 1.9 and 3.5, and thin-layer chromatography. Clean separation of phosphohydroxylysine from the other phospho amino acids, phosphoethanolamine, and phosphocholine was achieved. Conditions were also determined to permit hydrolysis of proteins in 2 M HCl without loss of the phosphono group of phosphohydroxylysine residues. Experiments were then performed showing that 32P was incorporated into the hydroxylysine residues of cell-associated collagens when cultured calf aorta medial smooth muscle cells were incubated with [32P]orthophosphate. In other experiments, the cells incorporated [3H]lysine into hydroxylysine residues of cell-associated collagen and then 32P into phosphohydroxylysine residues. The doubly labeled phosphohydroxylysine subsequently isolated showed nearly 1:1 stoichiometry with respect to incorporation of precursor lysine and phosphorus. Finally, in preliminary experiments done with a cell-free extract of the smooth muscle cells, 32P was transferred from [gamma-32P]ATP to hydroxylysine residues in several kinds of collagenous substrates. Thus, this work shows that smooth muscle cells have the capacity to phosphorylate hydroxylysine residues in their cell-associated collagens and provides preliminary evidence that a protein kinase is involved. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 10 |
| Volume Number | 82 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1985-06-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Collagen Metabolism Muscle, Smooth, Vascular Acids Animals Aorta Cells, Cultured Biosynthesis Hydrolysis Hydroxylysine Isoelectric Point Phosphorylation Protein Kinases Protein Processing, Post-Translational Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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