title: Effect of environmental factors on the production of oxygenated unsaturated fatty acids from linoleic acids by Bacillus megaterium ALA2.
abstract: We identified many novel oxygenated fatty acids produced from linoleic acid by Bacillus megaterium ALA2: 12,13,17-trihydroxy-9(Z)-octadecenoic acid (12,13,17-THOA); 12,13,16-trihydroxy-9(Z)-octadecenoic acid (12,13,16-THOA); 12-hydroxy-13,16-epoxy-9(Z)-octadecenoic acid; and 12,17;13,17-diepoxy-16-hydroxy-9(Z)-octadecenoic acid. 12,13,17-THOA, the main product, has antiplant pathogenic fungal activity. To develop an industrial process for the production of these new oxygenated fatty acids by strain ALA2, the effect of environmental factors on the production and their impact on the amount of various products were studied. Dextrose at 5 g/l was the optimum amount for the carbon source. A combination of 15 g yeast extract and 10 g tryptone showed good results as nitrogen sources. Among the metal ions tested, the optimum concentrations for the reaction for the different ions were as follows (in mM): magnesium 2.0, iron 0.5, zinc 0.1, nickel 0.01, and cobalt 0.05. Copper ions did not affect the production of oxygenated products; however, manganese ions inhibited the reaction. Addition of these metal ions did not alter the distribution of products. The optimum temperature and pH for the production of THOAs were 30 degrees C and pH 6.5. Time course studies showed 40-48 h is the optimum for the production of both THOAs. These data provide the basis for engineering scale-up production of these new products.
authors.affiliation: National Center for Agricultural Utilization Research, Agricultural Research Service, United States Department of Agriculture, 1815 North University Street, Peoria, IL 61604, USA. houct@ncaur.usda.gov
authors.forename: Ching T
authors.initials: CT
authors.lastname: Hou
mesh_terms: D000332:Aerobiosis; D001410:Bacillus megaterium / Q000254:growth & development* / Q000378:metabolism*; D001431:Bacteriological Techniques; D001709:Biotechnology / Q000379:methods; D002244:Carbon / Q000378:metabolism; D003470:Culture Media; D005231:Fatty Acids, Unsaturated / Q000096:biosynthesis*; D006863:Hydrogen-Ion Concentration; D008041:Linoleic Acids / Q000378:metabolism*; D008670:Metals / Q000494:pharmacology; D009584:Nitrogen / Q000378:metabolism; D013696:Temperature; D013997:Time Factors
chemical_list: D003470:Culture Media; D005231:Fatty Acids, Unsaturated; D008041:Linoleic Acids; D008670:Metals; D002244:Carbon; D009584:Nitrogen