Isolation and characterization of activin receptor from mouse embryonal carcinoma cells. Identification of its serine/threonine/tyrosine protein kinase activity. |
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Authors: | T Nakamura K Sugino N Kurosawa M Sawai K Takio Y Eto S Iwashita M Muramatsu K Titani H Sugino |
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Institution: | Frontier Research Program, Institute of Physical and Chemical Research (RIKEN), Saitama, Japan. |
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Abstract: | The activin receptor protein was isolated from the mouse embryonal carcinoma (EC) cell line P19 by three cycles of affinity chromatography on an activin A-immobilized column. The purified receptor had a specific and high affinity for activins A, AB, and B (Kd = 345 pM), but not for transforming growth factor beta. The purified activin receptor was identified by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and ligand blotting analysis as a single protein of 70 kDa. The amino acid sequence of the first 18 NH2-terminal residues revealed that the receptor is a member of the activin receptor family. The purified receptor phosphorylated itself and exogenous substrate proteins on serine, threonine, and tyrosine residues, indicating that the activin receptor is a transmembrane serine/threonine/tyrosine protein kinase. These results suggest that signal transduction of activin employs a novel pathway via a new class of cellular receptor in EC P19 cells. |
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