Abstract
Expression of the Saccharomyces cerevisiae PIS gene encoding phosphatidylinositol synthase in Escherichia coli was achieved by inserting its coding sequence into lacZ on pUC8. The fused gene encoded a phosphatidylinositol synthase whose amino-terminal three amino acids had been replaced by the amino-terminal five amino acids of E. coli beta-galactosidase. E. coli cells bearing this recombinant plasmid produced a significant level of phosphatidylinositol synthase in the presence of a lacZ inducer, isopropylthio-beta-D-galactopyranoside. When the culture medium was supplemented with myo-inositol and isopropylthio-beta-D-galactopyranoside, the cells accumulated a substantial amount of phosphatidylinositol in their membranes. When a saturating level of myo-inositol was added, phosphatidylinositol constituted about 4% of the total phospholipids. Phosphatidylinositol accumulation occurred at the expense of phosphatidylglycerol. The ratio of phosphatidylethanolamine to total acidic phospholipids remained constant. The growth rate of phosphatidylinositol-containing E. coli cells did not differ significantly from that of cells with the normal phospholipid composition.
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