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| Content Provider | PubMed Central |
|---|---|
| Author | Pagh, K. Maruta, H. Claviez, M. Gerisch, G. |
| Abstract | Phosphorylation of the myosin heavy chains of Dictyostelium discoideum is known to be inhibited following chemotactic stimulation of the cells. Effects of dephosphorylation on the assembly of myosin and on its actin-activated ATPase activity raised the question of where the phosphorylated sites are located with respect to sites responsible for polymerization and actin binding. Using seven monoclonal antibodies the binding sites of which were mapped in the electron microscope, two phosphorylation sites, i.e., threonine residues that were phosphorylated by a kinase from D. discoideum, were localized by immunoblotting of chymotryptic fragments. Two of the antibodies bound to the terminal one fifth of the tail and recognized a phosphorylated chymotryptic fragment of 38 kd. The non-phosphorylated form and single and double phosphorylated forms of this fragment were separated by two-dimensional electrophoresis. Antibody labeling of lower mol. wt. polypeptides indicated that both phosphorylation sites were located at least 32 kd from the end of the tail. A non-phosphorylated fragment, that was insoluble at low ionic strength due to polymerization, proved to be an internal cleavage product of the tail. A segment of this fragment necessary for polymerization was mapped adjacent to the phosphorylation sites. |
| Starting Page | 3271 |
| File Format | |
| ISSN | 14602075 |
| e-ISSN | 14602075 |
| Journal | The EMBO Journal |
| Issue Number | 13 |
| Volume Number | 3 |
| Language | English |
| Publisher Date | 1984-12-20 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Neuroscience Immunology and Microbiology Medicine Molecular Biology |
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