Abstract
A decrease in epidermal growth factor (EGF) * binding to its receptor was induced by Ca 2+ -pretreatment of liver membrane. In the iodoacetamide-pretreated membrane whose endogenous transglutaminase (TGase) * was inactivated, the effect of Ca 2+ -pretreatment was not observed, but this was again observed on the addition of TGase. Labeled putrescines were incorporated into 35 kD, 43 kD and 90 kD membrane proteins in the presence of Ca 2+ , but not in its absence. In the iodoacetamide-pretreated membrane, the putrescine was not incorporated into any proteins in the presence of Ca 2+ , but was incorporated into 43 kD protein in the presence of Ca 2+ and TGase. This 43 kD protein seemed to be identical to actin in immunoblotting analysis
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