Abstract
The membrane-associated enzymes phosphatidylinositol synthase (CDPdiacylglycerol:myo-inositol 3-phosphatidyltransferase; EC 2.7.8.11) and phosphatidylserine synthase (CDPdiacylglycerol:L-serine O-phosphatidyltransferase; EC 2.7.8.8) from Saccharomyces cerevisiae were detected enzymatically after sodium dodecyl sulfate-polyacrylamide gel electrophoresis and electroblotting. Enzyme activities were measured on nitrocellulose blots by using pure enzyme preparations as well as Triton X-100-solubilized membranes. Phosphatidylinositol synthase activity migrated to Mr 34,000, and phosphatidylserine synthase activity migrated to Mr 23,000.
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