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The pattern of phospholipid synthesis during the cell cycle of Caulobacter crescentus has been determined. Although the phospholipid composition of swarmer and stalked cells was indistinguishable in continuously labeled cultures if the two cell types were pulse-labeled for a short time period, marked differences in the pattern of phospholipid synthesis were detected. Pulse-labeled swarmer cells exhibited a higher proportion of phosphatidic acid and a lower proportion of phosphatidylglycerol. In addition, minor phospholipids were detected in the swarmer cells that were not detected in stalked cells. Stalked cells that developed directly from swarmer cells showed that same phospholipid profile as the swarmer cells. The switch to the second phospholipid profile was observed to occur at the predivisional cell stage. Because cell division then yielded a swarmer cell with a different phospholipid profile than its sibling stalked cell, the cell division process may trigger a mechanism which alters the pattern of phospholipid synthesis.

Differential membrane phospholipid synthesis during the cell cycle of Caulobacter crescentus