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The release of free fatty acids from the phospholipids of Escherichia coli is initiated immediately after the attachment of T4 ghosts. A similar accumulation of free fatty acids is observed if the cells are infected with T4 phage in the presence of chloramphenicol or puromycin. An early accumulation of free fatty acids, however, is not observed in T4 infections in which chloramphenicol or puromycin are not present, nor does it occur if the E. coli are infected with T4 phage before ghost infection, suggesting that phage products can prevent the phospholipid deacylation. If E. coli is infected with T4 ghosts before T4 phage infection, the accumulation of free fatty acids is not suppressed. When phospholipase-deficient E, coli are infected with T4 ghosts the appearance of free fatty acids is not observed, suggesting that T4 ghost attachment can activate the phospholipase of wild-type E. coli. Although the formation of free fatty acid apparently is a consequence of activation of the detergent-resistant phospholipase of the outer membrane, it is not observed in mutants deficient in the detergent-sensitive phospholipase.

Phospholipase activity in bacteriophage-infected Escherichia. II. Activation of phospholipase by T4 ghost infection