Abstract
It was shown that the cytosol fraction of bovine retinal rod outer segments contains three forms of tyrosine kinase. One of them was purified 171-fold to attain a specific activity of 1.6 nmol/min per mg protein. The isolated protein had a molecular weight of about 54,000 in SDS electrophoresis. It was shown that this protein is a tyrosine-specific protein kinase, capable of autophosphorylation at the tyrosine residues and restoration of kinase activity upon denaturation-renaturation.
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