title: Production of [14C]fumonisin B1 by Fusarium moniliforme MRC 826 in corn cultures.
abstract: Kinetics of growth and fumonisin production by Fusarium moniliforme MRC 826 in corn "patty" cultures were investigated, and a technique was developed for the production of [14C]fumonisin B1 ([14C]FB1) by using L-[methyl-14C]methionine as the precursor. A significant (P < 0.01) correlation exists between fungal growth and FB1 (r = 0.89) and FB2 (r = 0.87) production in corn patties, beginning after 2 days and reaching the stationary phase after 14 days of incubation. [14C]FB1 was produced by adding L-[methyl-14C]methionine daily to cultures during the logarithmic phase of production. Incorporation of the isotope occurred at C-21 and C-22 of the fumonism molecule and was enhanced in the presence of unlabeled L-methionine. Although the concentration of exogenous unlabeled methionine is critical for incorporation of the 14C label, optimum incorporation was achieved by adding 50 mg of unlabeled L-methionine and 200 mu Ci of L-[methyl-14C]methionine to a corn patty (30 g) over a period of 9 days, yielding [14C]FB1 with a specific activity of 36 mu Ci/mmol.
authors.affiliation: Programme on Mycotoxins and Experimental Carcinogenesis, South African Medical Research Council, Tygerberg.
authors.forename: J F
authors.initials: JF
authors.lastname: Alberts
authors.forename: W C
authors.initials: WC
authors.lastname: Gelderblom
authors.forename: R
authors.initials: R
authors.lastname: Vleggaar
authors.forename: W F
authors.initials: WF
authors.lastname: Marasas
authors.forename: J P
authors.initials: JP
authors.lastname: Rheeder
mesh_terms: D002250:Carbon Radioisotopes; D037341:Fumonisins; D005670:Fusarium / Q000254:growth & development / Q000378:metabolism*; D007700:Kinetics; D008715:Methionine / Q000378:metabolism; D009172:Mycology / Q000379:methods; D009183:Mycotoxins / Q000096:biosynthesis* / Q000737:chemistry; D003313:Zea mays / Q000382:microbiology
chemical_list: D002250:Carbon Radioisotopes; D037341:Fumonisins; D009183:Mycotoxins; C056933:fumonisin B1; D008715:Methionine