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. 1985 Apr;162(1):50–54. doi: 10.1128/jb.162.1.50-54.1985

Phosphoglycerides and phospholipase C in membrane fractions of Escherichia coli B.

M H Bayer, M E Bayer
PMCID: PMC218951  PMID: 3920208

Abstract

The phospholipid composition and the phospholipase C activity of envelope fractions of Escherichia coli B were determined with special consideration of fractions containing sites at which an attachment of inner and outer membranes had been observed in the electron microscope (Int.M). Phosphoglycerides labeled with [14C]palmitic acid and [3H]serine were extracted from membrane fractions and identified by two-dimensional thin-layer chromatography. The amount of phosphatidylethanolamine was highest in the outer membrane, whereas the amounts of phosphatidylglycerol and cardiolipin were highest in the inner membrane. The Int.M fractions were observed to have concentrations of phospholipids intermediate to those of the inner and outer membranes. This result supports the assumption that a concentration gradient of inner membrane-outer membrane lipids might exist at the membrane contact sites. The highest phospholipase C activity was detected in the inner membrane and Int.M fractions. The presence of phospholipase C and other lipolytic enzymes in the Int.M fractions suggests a possible involvement of adhesion sites in lipid metabolism, adding a further set of activities to the function of these domains.

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Selected References

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