Abstract
1. 1. The phospholipase A 1 activity of beef pancreas was purified till near homogeneity using 1[9,10- 3H 2]-palmitoyl-2[1- 14C]-linoleoylphosphatidylethanolamine as substrate. 2. 2. The phospholipase A 1 activity was found to be different from pancreatic lipase. 3. 3. Evidence is provided indicating that phospholipase A 1 activity in beef pancreas is caused by an esterolytic enzyme that also exhibits lysophospholipase activity. 4. 4. Phospholipase A 1 activity is greatly stimulated by sodium deoxycholate, whereas lysophospholipase activity is inhibited by this detergent. 5. 5. Under certain conditions this enzyme exhibits phospholipase B activity i.e. catalyses the complete deacylation of phosphatidylcholine. 6. 6. Some similarities between this enzyme and other phospholipases A 1 described in the literature are discussed.
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