title: Purification of a phospholipase B inhibitor from Saccharomyces cerevisiae.
abstract: The phospholipase B activity of plasma membrane vesicles from Saccharomyces cerevisiae is inhibited by the 100 000 X g supernatant of mechanically disrupted yeast cells. A 1850-fold purification of the inhibitor activity was achieved by gel filtration, ion exchange chromatography with DEAE-cellulose and hydrophobic interaction chromatography with Octyl-Sepharose. SDS-polyacrylamide gel electrophoresis of the purified inhibitor revealed two main bands with an apparent Mr of 60 000 and 26 500. The phospholipase B activity was strongly reduced but not completely blocked by this preparation, while the lysophospholipase and transacylase reactions, which are catalyzed by the same membrane-bound enzymes (Witt, W. et al. (1984) Biochim. Biophys. Acta 795, 108-116), were not affected.
mesh_terms: D002462:Cell Membrane / Q000201:enzymology; D002848:Chromatography, DEAE-Cellulose; D002850:Chromatography, Gel; D002852:Chromatography, Ion Exchange; D004591:Electrophoresis, Polyacrylamide Gel; D004791:Enzyme Inhibitors / Q000302:isolation & purification; D008245:Lysophospholipase / Q000037:antagonists & inhibitors*; D010455:Peptides / Q000302:isolation & purification*; D010740:Phospholipases / Q000037:antagonists & inhibitors*; D012441:Saccharomyces cerevisiae / Q000201:enzymology*
chemical_list: D004791:Enzyme Inhibitors; D010455:Peptides; D010740:Phospholipases; D008245:Lysophospholipase