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Turnover of Phosphatidylglycerol in Escherichia coli

¹ Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, Massachusetts 02111, and Instituto de Biologia Cellular, Velazquez 144, Madrid 6, Spain

ABSTRACT

In growing cultures of Escherichia coli, the nonacylated glycerol of phosphatidylglycerol (PG) is labeled more rapidly than is the acylated glycerol. This is, in part, due to a rapid exchange reaction of the nonacylated glycerol. Only some of the PG molecules undergo this reaction while others are stable. Using a mutant unable to make glycerophosphate, we have shown that the nonacylated glycerol of PG can exchange with non-phosphorylated glycerol.

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