Abstract
The protein kinase activity located in the cytosol of hereditary spherocytosis erythrocytes is due to multiple forms which can be resolved by Sepharose 6B filtration at high ionic strength into two fractions phosphorylating the whole casein on different sites. The membrane-bound protein kinases, solubilized by 0.7 M NaCl, display an elution volume from Sepharose column and a phosphorylation behaviour towards casein quite similar to those of the more retarded fraction of hemolysate. When compared with the multiple protein kinase forms from normal human erythrocytes, no significant difference has been found.
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