title: Presence of glycerophospholipid: cholesterol acyltransferase and phospholipase in culture supernatant of Aeromonas hydrophila.
abstract: Human erythrocyte membrane glycerophospholipids are deacylated by Aeromonas hydrophila 13-h culture supernatants, resulting in the production of cholesterol ester, free fatty acid, and water-soluble phosphates. This activity appears to be due to the actions of an acyltransferase (phosphatide:cholesterol acyltransferase, EC 2.3.1 group) and a phospholipase (phosphatide acyl-hydrolase). The enzyme activities are produced simultaneously in late exponential/early stationary phase, are precipitated together from the culture supernatant with 85% ammonium sulfate, and are eluted together near the void volume during gel filtration on Sepharose 6B. These results suggest that A. hydrophila produces a multienzyme complex with an unusual mode of action on membrane lipids. The complex is distinct from the hemolytic factor aerolysin, which is also produced by A. hydrophila.
mesh_terms: D000217:Acyltransferases / Q000378:metabolism*; D000333:Aeromonas / Q000201:enzymology* / Q000254:growth & development; D004910:Erythrocyte Membrane; D008081:Liposomes / Q000378:metabolism; D008563:Membrane Lipids / Q000378:metabolism; D009097:Multienzyme Complexes / Q000378:metabolism*; D010740:Phospholipases / Q000378:metabolism*; D010743:Phospholipids / Q000378:metabolism
chemical_list: D008081:Liposomes; D008563:Membrane Lipids; D009097:Multienzyme Complexes; D010743:Phospholipids; D000217:Acyltransferases; D010740:Phospholipases