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Stringent and Relaxed Control of Phospholipid Metabolism in Escherichia coli

From the ¹ From the Department of Chemistry and Geology, Clemson University, Clemson, South Carolina 29631

Stringent cells of Escherichia coli (rel⁺) cease growth and protein, RNA, and lipid synthesis when deprived of a required amino acid; relaxed cells (rel^-) cease growth and protein synthesis but continue lipid synthesis when deprived of a required amino acid, as assayed by [¹⁴C]acetate incorporation. When phospholipid synthesis was assayed by using ³²P_i, some net synthesis does occur, but the majority of the incorporation is a consequence of rapid breakdown and resynthesis (turnover) of phosphatidylethanolamine, normally a stable component of the cell envelope.

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