title: Production of enniatins A, A1, B, B1, B4, J1 by Fusarium tricinctum in solid corn culture: structural analysis and effects on mitochondrial respiration.
abstract: Enniatins (ENs) are secondary fungal metabolites with hexadepsipeptidic chemical structure and they possess a number of potent biological activities that can contaminate several kind of food and foodstuffs increasing the exposure risk for consumers. ENs are produced by several Fusariun strains including Fusarium subglutinans, Fusarium proliferatum and Fusarium tricinctum. Production of a mixture of ENs was performed by culturing F. tricinctum ITEM 9496 on white corn as substrate. The solid culture components were dried and subsequently extracted with water/methanol (50/50 v/v, 0.5% NaCl), homogenised, filtered, extracted by ethyl acetate and analysed by liquid chromatography with diode array detection (LC-DAD). The crude extract was first separated by low pressure liquid chromatography (LPLC) and then further purified by liquid chromatography (LC), resulting in six compounds with a purity higher than 95% as calculated by (1)H NMR, and with a yield of 30-300mg per compound. The chemical structures of the ENs were determined by liquid chromatography coupled to mass spectrometry (LC-MS) and nuclear magnetic resonance (NMR). The biological activity of the resulting ENs was determined using a mitochondrial respiration test. We discovered that all the ENs studied induced an increase in the mitochondrial respiration resulting in uncoupling of the oxidative phosphorylation. This effect was most likely due to flux of K(+) ions into the mitochondrial matrix. The order of potency of the ENs derivatives was: A1>B1>B>A>B4>J1. These results suggest a correlation between the chemical structures and bioactivity and confirm the severe risks for human associated with consumption of enniatins.
authors.affiliation: Department of Food Science. University of Naples "Federico II", via Universitá 100, 80055 Portici, Napoli, Italy.
authors.forename: Valentina
authors.initials: V
authors.lastname: Cuomo
authors.forename: Antonio
authors.initials: A
authors.lastname: Randazzo
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Meca
authors.forename: Antonio
authors.initials: A
authors.lastname: Moretti
authors.forename: Annunziata
authors.initials: A
authors.lastname: Cascone
authors.forename: Ove
authors.initials: O
authors.lastname: Eriksson
authors.forename: Ettore
authors.initials: E
authors.lastname: Novellino
authors.forename: Alberto
authors.initials: A
authors.lastname: Ritieni
mesh_terms: D002851:Chromatography, High Pressure Liquid; D003470:Culture Media / Q000737:chemistry / Q000378:metabolism; D047630:Depsipeptides / Q000737:chemistry* / Q000378:metabolism; D005670:Fusarium / Q000737:chemistry / Q000378:metabolism*; D009682:Magnetic Resonance Spectroscopy; D008928:Mitochondria / Q000378:metabolism*; D015394:Molecular Structure; D009183:Mycotoxins / Q000737:chemistry*; D003313:Zea mays / Q000378:metabolism / Q000382:microbiology*
chemical_list: D003470:Culture Media; D047630:Depsipeptides; D009183:Mycotoxins; C100264:enniatins