Abstract
1. 1. Plasma membranes were treated with phospholipase A 2, phospholipase C or phospholipase D. The phosphatidylethanolamine: ceramide-phosphorylethanolamine transferase was deactivated by phospholipase C treatment, whereas phospholipase A 2 and phospholipase D did not affect the enzyme. 2. 2. Incorporation of phosphatidylethanolamine and phosphatidylglycerol into partially delipidated plasma membranes resulted in significant stimulation of the transferase, whereas inclusion of sphingomyelin and phosphatidylserine suppressed the enzyme activity. Our results suggest that phosphatidylserine is a regulator of sphingomyelin level in membranes. 3. 3. The activity of phosphatidylethanolamine xeramide-phosphorylethanolamine transferase was not influenced by the fluidity of its lipid environment.
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