1
|
Zhang J, Huang R, Feng Y, Yang T, Sun M, Kuang H, Xu C, Guo L. Development and validation of stable isotope dilution LC-MS/MS method for simultaneous quantification of four Alternaria toxins in 15 food commodities. Food Chem 2024; 457:140122. [PMID: 38908243 DOI: 10.1016/j.foodchem.2024.140122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2024] [Revised: 05/24/2024] [Accepted: 06/13/2024] [Indexed: 06/24/2024]
Abstract
Alternaria toxins (ATs) are produced from Alternaria species that result in crop losses and harmful impacts on human health. A stable isotope dilution LC-MS/MS method was established to quantify four ATs in 15 food commodities: alternariol (AOH), alternariol monomethyl ether (AME), tentoxin (TEN), and tenuazonic acid (TeA). Based on systematically optimization of detection conditions and pre-processing steps, the limits of detection and limits of quantification of the four ATs ranged from 0.1 to 10 μg/kg and 0.2 to 30 μg/kg, respectively. The results showed that the recoveries of the four ATs were 72.0%-119.1%. The intra-precision and inter-precision ranged from 0.7% to 11.1% and 1.1% to 13.1%, respectively. The method was successfully applied to the determination of four ATs in 35 food samples, suggesting that this method could provide meaningful occurrence data to support the assessment of emerging ATs in food commodities.
Collapse
Affiliation(s)
- Jia Zhang
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu 214122, People's Republic of China; International Joint Research Laboratory for Biointerface and Biodetection, and School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, People's Republic of China
| | - Renzhi Huang
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu 214122, People's Republic of China; International Joint Research Laboratory for Biointerface and Biodetection, and School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, People's Republic of China
| | - Yongwei Feng
- Wuxi Food Safety Inspection and Test Center, 35-210 South Changjiang Road, Wuxi, Jiangsu Province 214142, People's Republic of China
| | - Ting Yang
- Wuxi Food Safety Inspection and Test Center, 35-210 South Changjiang Road, Wuxi, Jiangsu Province 214142, People's Republic of China
| | - Maozhong Sun
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu 214122, People's Republic of China; International Joint Research Laboratory for Biointerface and Biodetection, and School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, People's Republic of China
| | - Hua Kuang
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu 214122, People's Republic of China; International Joint Research Laboratory for Biointerface and Biodetection, and School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, People's Republic of China
| | - Chuanlai Xu
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu 214122, People's Republic of China; International Joint Research Laboratory for Biointerface and Biodetection, and School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, People's Republic of China
| | - Lingling Guo
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu 214122, People's Republic of China; International Joint Research Laboratory for Biointerface and Biodetection, and School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, People's Republic of China.
| |
Collapse
|
2
|
Kryukov V, Kosman E, Tomilova O, Polenogova O, Rotskaya U, Yaroslavtseva O, Salimova D, Kryukova N, Berestetskiy A. Tenuazonic acid alters immune and physiological reactions and susceptibility to pathogens in Galleria mellonella larvae. Mycotoxin Res 2023; 39:135-149. [PMID: 37071305 DOI: 10.1007/s12550-023-00479-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 03/06/2023] [Accepted: 03/07/2023] [Indexed: 04/19/2023]
Abstract
Tenuazonic acid (TeA) is synthesized by phytopathogenic and opportunistic fungi and is detected in a broad range of foods. This natural compound is of interest in terms of toxicity to animals, but its mechanisms of action on insects are poorly understood. We administered TeA orally at different concentrations (0.2-5.0 mg/[gram of a growth medium]) to the model insect Galleria mellonella, with subsequent estimation of physiological, histological, and immunological parameters in different tissues (midgut, fat body, and hemolymph). Susceptibility of the TeA-treated larvae to pathogenic microorganisms Beauveria bassiana and Bacillus thuringiensis was also analyzed. The feeding of TeA to the larvae led to a substation delay of larval growth, apoptosis-like changes in midgut cells, and an increase in midgut bacterial load. A decrease in activities of detoxification enzymes and downregulation of genes Nox, lysozyme, and cecropin in the midgut and/or hemocoel tissues were detected. By contrast, genes gloverin, gallerimycin, and galiomycin and phenoloxidase activity proved to be upregulated in the studied tissues. Hemocyte density did not change under the influence of TeA. TeA administration increased susceptibility of the larvae to B. bassiana but diminished their susceptibility to B. thuringiensis. The results indicate that TeA disturbs wax moth gut physiology and immunity and also exerts a systemic action on this insect. Mechanisms underlying the observed changes in wax moth susceptibility to the pathogens are discussed.
Collapse
Affiliation(s)
- Vadim Kryukov
- Institute of Systematics and Ecology of Animals, Siberian Branch of Russian Academy of Sciences, 630091, Frunze 11, Novosibirsk, Russia
| | - Elena Kosman
- Institute of Systematics and Ecology of Animals, Siberian Branch of Russian Academy of Sciences, 630091, Frunze 11, Novosibirsk, Russia
| | - Oksana Tomilova
- Institute of Systematics and Ecology of Animals, Siberian Branch of Russian Academy of Sciences, 630091, Frunze 11, Novosibirsk, Russia
- All-Russian Institute of Plant Protection, 196608, Podbel'skogo Sh. 3, Pushkin, St. Petersburg, Russia
| | - Olga Polenogova
- Institute of Systematics and Ecology of Animals, Siberian Branch of Russian Academy of Sciences, 630091, Frunze 11, Novosibirsk, Russia.
| | - Ulyana Rotskaya
- Institute of Systematics and Ecology of Animals, Siberian Branch of Russian Academy of Sciences, 630091, Frunze 11, Novosibirsk, Russia
| | - Olga Yaroslavtseva
- Institute of Systematics and Ecology of Animals, Siberian Branch of Russian Academy of Sciences, 630091, Frunze 11, Novosibirsk, Russia
| | - Dilara Salimova
- All-Russian Institute of Plant Protection, 196608, Podbel'skogo Sh. 3, Pushkin, St. Petersburg, Russia
| | - Natalia Kryukova
- Institute of Systematics and Ecology of Animals, Siberian Branch of Russian Academy of Sciences, 630091, Frunze 11, Novosibirsk, Russia
| | - Alexander Berestetskiy
- All-Russian Institute of Plant Protection, 196608, Podbel'skogo Sh. 3, Pushkin, St. Petersburg, Russia
| |
Collapse
|
3
|
Chang CH, Lee YC, Hsiao G, Chang LK, Chi WC, Cheng YC, Huang SJ, Wang TC, Lu YS, Lee TH. Anti-Epstein-Barr Viral Agents from the Medicinal Herb-Derived Fungus Alternaria alstroemeriae Km2286. JOURNAL OF NATURAL PRODUCTS 2022; 85:2667-2674. [PMID: 36346918 DOI: 10.1021/acs.jnatprod.2c00783] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Chromatographic separation on the liquid-state fermented products produced by the fungal strain Alternaria alstroemeriae Km2286 isolated from the littoral medicinal herb Atriplex maximowicziana Makino resulted in the isolation of compounds 1-9. Structures were determined by spectroscopic analysis as four undescribed perylenequinones, altertromins A-D (1-4), along with altertoxin IV (5), altertoxin VIII (6), stemphyperylenol (7), tenuazonic acid (8), and allo-tenuazonic acid (9). Compounds 1-6 exhibited antiviral activities against Epstein-Barr virus (EBV) with EC50 values ranging from 0.17 ± 0.07 to 3.13 ± 0.31 μM and selectivity indices higher than 10. In an anti-neuroinflammatory assay, compounds 1-4, 6, and 7 showed inhibitory activity of nitric oxide production in lipopolysaccharide-induced microglial BV-2 cells, with IC50 values ranging from 0.33 ± 0.04 to 4.08 ± 0.53 μM without significant cytotoxicity. This is the first report to describe perylenequinone-type compounds with potent anti-EBV and anti-neuroinflammatory activities.
Collapse
Affiliation(s)
- Chia-Hao Chang
- Institute of Fisheries Science, National Taiwan University, Taipei 10617, Taiwan
| | - Yi-Chieh Lee
- Institute of Fisheries Science, National Taiwan University, Taipei 10617, Taiwan
| | - George Hsiao
- Department of Pharmacology, School of Medicine, College of Medicine, Taipei Medical University, Taipei 11031, Taiwan
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei 11031, Taiwan
| | - Li-Kwan Chang
- Department of Biochemical Science and Technology, College of Life Science, National Taiwan University, Taipei 10617, Taiwan
| | - Wei-Chiung Chi
- Department of Food Science, National Quemoy University, Kinmen 89250, Taiwan
| | - Yuan-Chung Cheng
- Department of Chemistry and Center for Quantum Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
| | - Shu-Jung Huang
- Institute of Fisheries Science, National Taiwan University, Taipei 10617, Taiwan
| | - Tai-Chou Wang
- Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan
| | - Yi-Shan Lu
- Department of Biochemical Science and Technology, College of Life Science, National Taiwan University, Taipei 10617, Taiwan
| | - Tzong-Huei Lee
- Institute of Fisheries Science, National Taiwan University, Taipei 10617, Taiwan
| |
Collapse
|
4
|
Determination of Alternaria Toxins in Food by SPE and LC-IDMS: Development and In-House Validation of a Candidate Method for Standardisation. SEPARATIONS 2022. [DOI: 10.3390/separations9030070] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Alternaria toxins (ATs) are frequently found contaminants in foodstuffs (e.g., alternariol), often reaching high concentrations (e.g., tenuazonic acid). They can spoil a wide variety of food categories (e.g., cereals, vegetables, seeds and drinks) and storage at fridge temperatures does not prevent the growth of Alternaria fungi. Therefore, reliable and validated analytical methods are needed to protect human health and to ensure a transparent and fair trade. This paper describes new technical features that improved a liquid chromatography-tandem mass spectrometry (LC-MS/MS) method for the analysis of ATs in tomato, wheat and sunflower seeds. This analytical method should be simple to implement in different laboratories across the EU and thus be an attractive candidate for standardisation. The major element for improvement was the use of isotopically labelled internal standards, only recently commercially available, thereby reducing the sample handling and improving the accuracy of the results. In addition, the sample extraction and the solid-phase extraction (SPE) enrichment/clean-up were fine-tuned, whereas a more suitable analytical column (XSelect HSS T3) with improved selectivity was also employed. Overall, this method shows adequate precision (repeatability < 5.7% RSD; intermediate precision < 7.0% RSD) and trueness (recoveries ranging from 74% to 112%). The limits of quantification in wheat (the most analytically demanding matrix) vary between 0.19 and 1.40 µg/kg. These figures were deemed satisfactory by the European Committee for Standardization (CEN) and have formed the basis for a subsequent interlaboratory validation study. The corresponding standard was published by CEN in 2021.
Collapse
|
5
|
Quílez-Alburquerque J, García-Iriepa C, Marazzi M, Descalzo AB, Orellana G. Interaction of a 1,3-Dicarbonyl Toxin with Ru(II)-Biimidazole Complexes for Luminescence Sensing: A Spectroscopic and Photochemical Experimental Study Rationalized by Time-Dependent Density Functional Theory Calculations. Inorg Chem 2022; 61:328-337. [PMID: 34923820 PMCID: PMC8753653 DOI: 10.1021/acs.inorgchem.1c02887] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Indexed: 12/05/2022]
Abstract
A family of ruthenium(II) complexes containing one 2,2'-biimidazole (bim) ligand and two polypyridyl (NN) ligands has been prepared and their photophysical and photochemical features have been tested in the presence of tenuazonic acid (TeA), a widespread food and feed mycotoxin of current concern. While not tested in in vivo studies, TeA and other secondary metabolites of Alternaria fungi are suspected to exert adverse effects on the human health, so sensors and rapid analytical procedures are required. It is well-known that 1,3-dicarbonyl compounds such as TeA are relatively easy to deprotonate (the pKa of TeA is 3.5), yielding an enolate anion stabilized by resonance. The chelating and hydrogen-donor features of bim allow simultaneous binding to the metal core and to the target β-diketonate delocalized anion. Such a binding induces changes in the blue absorption (40 nm bathochromic shift), red luminescence intensity (>75% quenching), and triplet lifetime (0.2 μs decrease) of the Ru(NN)2(bim)2+ luminophore. Moreover, we have computationally rationalized, by time-dependent density functional theory, the structure of the different adducts of Ru-bim complexes with TeA and the electronic nature of the spectral absorption bands and their change upon the addition of TeA.
Collapse
Affiliation(s)
- José Quílez-Alburquerque
- Department
of Organic Chemistry, Faculty of Chemistry, Universidad Complutense de Madrid, Madrid 28040, Spain
| | - Cristina García-Iriepa
- Departamento
de Química Analítica, Química Física e
Ingeniería Química, Universidad
de Alcalá, Alcalá
de Henares (Madrid) 28871, Spain
- Instituto
de Investigación Química “Andrés M. del
Río” (IQAR), Universidad de
Alcalá, Alcalá de
Henares (Madrid) 28871, Spain
| | - Marco Marazzi
- Departamento
de Química Analítica, Química Física e
Ingeniería Química, Universidad
de Alcalá, Alcalá
de Henares (Madrid) 28871, Spain
- Instituto
de Investigación Química “Andrés M. del
Río” (IQAR), Universidad de
Alcalá, Alcalá de
Henares (Madrid) 28871, Spain
| | - Ana B. Descalzo
- Department
of Organic Chemistry, Faculty of Chemistry, Universidad Complutense de Madrid, Madrid 28040, Spain
| | - Guillermo Orellana
- Department
of Organic Chemistry, Faculty of Chemistry, Universidad Complutense de Madrid, Madrid 28040, Spain
| |
Collapse
|
6
|
Salimova D, Dalinova A, Dubovik V, Senderskiy I, Stepanycheva E, Tomilova O, Hu Q, Berestetskiy A. Entomotoxic Activity of the Extracts from the Fungus, Alternaria tenuissima and Its Major Metabolite, Tenuazonic Acid. J Fungi (Basel) 2021; 7:774. [PMID: 34575812 PMCID: PMC8468458 DOI: 10.3390/jof7090774] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 09/08/2021] [Accepted: 09/13/2021] [Indexed: 12/22/2022] Open
Abstract
The study of fungal antibiotics in their competitive interactions with arthropods may lead to the development of novel biorational insecticides. Extracts of Alternaria tenuissima MFP253011 obtained using various methods showed a wide range of biological activities, including entomotoxic properties. Analysis of their composition and bioactivity allowed us to reveal several known mycotoxins and unidentified compounds that may be involved in the entomotoxic activity of the extracts. Among them, tenuazonic acid (TeA), which was the major component of the A. tenuissima extracts, was found the most likely to have larvicidal activity against Galleria mellonella. In the intrahaemocoel injection bioassay, TeA was toxic to G. mellonella and of Zophobas morio with an LT50 of 6 and 2 days, respectively, at the level of 50 µg/larva. Administered orally, TeA inhibited the growth of G. mellonella larvae and caused mortality of Acheta domesticus adults (LT50 7 days) at a concentration of 250 µg/g of feed. TeA showed weak contact intestinal activity against the two phytophages, Tetranychus urticae and Schizaphis graminum, causing 15% and 27% mortality at a concentration of 1 mg/mL, respectively. TeA was cytotoxic to the Sf9 cell line (IC50 25 µg/mL). Thus, model insects such as G. mellonella could be used for further toxicological characterization of TeA.
Collapse
Affiliation(s)
- Dilara Salimova
- Department of Phytotoxicology and Biotechnology, All-Russian Institute of Plant Protection, Podbelskogo Shosse, 3, Pushkin, 196608 Saint-Petersburg, Russia; (D.S.); (A.D.); (V.D.); (I.S.); (E.S.)
| | - Anna Dalinova
- Department of Phytotoxicology and Biotechnology, All-Russian Institute of Plant Protection, Podbelskogo Shosse, 3, Pushkin, 196608 Saint-Petersburg, Russia; (D.S.); (A.D.); (V.D.); (I.S.); (E.S.)
| | - Vsevolod Dubovik
- Department of Phytotoxicology and Biotechnology, All-Russian Institute of Plant Protection, Podbelskogo Shosse, 3, Pushkin, 196608 Saint-Petersburg, Russia; (D.S.); (A.D.); (V.D.); (I.S.); (E.S.)
| | - Igor Senderskiy
- Department of Phytotoxicology and Biotechnology, All-Russian Institute of Plant Protection, Podbelskogo Shosse, 3, Pushkin, 196608 Saint-Petersburg, Russia; (D.S.); (A.D.); (V.D.); (I.S.); (E.S.)
| | - Elena Stepanycheva
- Department of Phytotoxicology and Biotechnology, All-Russian Institute of Plant Protection, Podbelskogo Shosse, 3, Pushkin, 196608 Saint-Petersburg, Russia; (D.S.); (A.D.); (V.D.); (I.S.); (E.S.)
| | - Oksana Tomilova
- Institute of Systematics and Ecology of Animals SB RAS, Frunze Str. 11, 630091 Novosibirsk, Russia;
| | - Qiongbo Hu
- Key Laboratory of Bio-Pesticide Innovation and Application of Guangdong Province, College of Plant Protection, South China Agricultural University, Guangzhou 510642, China;
| | - Alexander Berestetskiy
- Department of Phytotoxicology and Biotechnology, All-Russian Institute of Plant Protection, Podbelskogo Shosse, 3, Pushkin, 196608 Saint-Petersburg, Russia; (D.S.); (A.D.); (V.D.); (I.S.); (E.S.)
| |
Collapse
|
7
|
Quílez-Alburquerque J, Descalzo AB, Moreno-Bondi MC, Orellana G. Luminescent molecularly imprinted polymer nanocomposites for emission intensity and lifetime rapid sensing of tenuazonic acid mycotoxin. POLYMER 2021. [DOI: 10.1016/j.polymer.2021.124041] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
|
8
|
Agwupuye JA, Neji PA, Louis H, Odey JO, Unimuke TO, Bisiong EA, Eno EA, Utsu PM, Ntui TN. Investigation on electronic structure, vibrational spectra, NBO analysis, and molecular docking studies of aflatoxins and selected emerging mycotoxins against wild-type androgen receptor. Heliyon 2021; 7:e07544. [PMID: 34345733 PMCID: PMC8319581 DOI: 10.1016/j.heliyon.2021.e07544] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 05/17/2021] [Accepted: 07/07/2021] [Indexed: 01/21/2023] Open
Abstract
The geometry, frontier molecular orbitals (FMOs), vibrational, NBO analysis, and molecular docking simulations of aflatoxins (B1, B2, M1, M2, G1, G2), zearalenone (ZEA) emodin (EMO), alternariol (AOH), alternariol monoethyl ether (AMME), and tenuazonic acid (TeA) mycotoxins have been extensively theoretically studied and discussed based on quantum density functional theory calculations using Gaussian 16 software package. The theoretical computation for the geometry optimization, NBOs, and the molecular docking interaction was conducted using Density Functional Theory with B3LYP/6-31+G(d,p), NBO program, and AutoDock Vina tools respectively. Charge delocalization patterns and second-order perturbation energies of the most interacting natural bond orbitals (NBOs) of these mycotoxins have also been computed and predicted. Interestingly, among the mycotoxins investigated, aflatoxin G1 is seen to give the strongest stabilization energy while Zearalenone shows the highest tendency to accept electron(s) and emodin, an emerging mycotoxin gave the best binding pose within the androgen receptor pocket with a mean binding affinity of -7.40 kcal/mol.
Collapse
Affiliation(s)
- John A. Agwupuye
- Department of Pure and Applied Chemistry, Faculty of Physical Sciences, University of Calabar, Calabar, Nigeria
- Computational Quantum Chemistry Research Group, Faculty of Physical Sciences, University of Calabar, Calabar, Nigeria
| | - Peter A. Neji
- Department of Chemistry, Faculty of Sciences, Cross River University of Technology, Calabar, Nigeria
| | - Hitler Louis
- Department of Pure and Applied Chemistry, Faculty of Physical Sciences, University of Calabar, Calabar, Nigeria
- Computational Quantum Chemistry Research Group, Faculty of Physical Sciences, University of Calabar, Calabar, Nigeria
| | - Joseph O. Odey
- Department of Pure and Applied Chemistry, Faculty of Physical Sciences, University of Calabar, Calabar, Nigeria
| | - Tomsmith O. Unimuke
- Department of Pure and Applied Chemistry, Faculty of Physical Sciences, University of Calabar, Calabar, Nigeria
| | - Emmanuel A. Bisiong
- Department of Pure and Applied Chemistry, Faculty of Physical Sciences, University of Calabar, Calabar, Nigeria
| | - Ededet A. Eno
- Department of Pure and Applied Chemistry, Faculty of Physical Sciences, University of Calabar, Calabar, Nigeria
| | - Patrick M. Utsu
- Department of Pure and Applied Chemistry, Faculty of Physical Sciences, University of Calabar, Calabar, Nigeria
| | - Tabe N. Ntui
- Department of Chemistry, Faculty of Sciences, Cross River University of Technology, Calabar, Nigeria
| |
Collapse
|
9
|
Liang Y, Wang Y, Wang F, Li J, Wang C, Dong J, Ueda H, Xiao Z, Shen Y, Xu Z, Wang H. An enhanced open sandwich immunoassay by molecular evolution for noncompetitive detection of Alternaria mycotoxin tenuazonic acid. Food Chem 2021; 361:130103. [PMID: 34082388 DOI: 10.1016/j.foodchem.2021.130103] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Revised: 05/10/2021] [Accepted: 05/11/2021] [Indexed: 10/21/2022]
Abstract
Open sandwich enzyme-linked immunosorbent assay (OS-ELISA), a novel noncompetitive immunoassay format, has shown great potential in rapid detection for small molecules compared with traditional competitive format. Here, an enhanced OS-ELISA towards the mycotoxin tenuazonic acid (TeA) was developed for the first time based on heavy chain variable region (VH) and light chain variable region (VL) from the hybridoma cells (3F10) producing anti-TeA monoclonal antibody (mAb). The established OS-ELISA exhibited a limit of detection of 0.08 ng/mL, and was 13 times more sensitive than mAb-based indirect competitive ELISA (ic-ELISA). The proposed assay was also applied to detect TeA contents in juice, flour and tomato ketchup samples with satisfactory recoveries of 87.6%-111.3%. Finally, the great accuracy of the established OS-ELISA method was validated by the standard ultra-performance liquid chromatography/tandem mass spectrometry (UPLC-MS/MS).
Collapse
Affiliation(s)
- Yifan Liang
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China
| | - Yu Wang
- Guangzhou Institute of Food Inspection, Guangzhou 510080, China
| | - Feng Wang
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China
| | - Jiadong Li
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China
| | - Chenglong Wang
- Guangzhou Institute of Food Inspection, Guangzhou 510080, China
| | - Jinhua Dong
- Key Laboratory for Biological Medicine in Shandong Universities, Weifang Key Laboratory for Antibody Medicine, School of Bioscience and Technology, Weifang Medical University, Weifang 261053, China
| | - Hiroshi Ueda
- World Research Hub Initiative, Institute of Innovative Research, Tokyo Institute of Technology, Yokohama 226-8503, Japan
| | - Zhili Xiao
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China
| | - Yudong Shen
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China
| | - Zhenlin Xu
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China.
| | - Hong Wang
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China.
| |
Collapse
|
10
|
Chang CC, Li CY, Tsai YH, El-Shazly M, Wei CK, Yang ZJ, Chen SL, Wu CC, Wu YC, Chang FR. Bioactive polyketides from the pathogenic fungus of Epicoccum sorghinum. PLANTA 2021; 253:116. [PMID: 33956231 DOI: 10.1007/s00425-021-03635-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2021] [Accepted: 04/24/2021] [Indexed: 06/12/2023]
Abstract
We discovered and identified a series of characteristic substances, including one new polyketide, epicorepoxydon B, of the important pathogenic fungus, Epicoccum sorghinum, of sorghum. The fungal extract and some isolated polyketides are sensitive to a malignant triple-negative breast cancer cell line, MDA-MB-231. Sorghum (Kaoliang) grain is an important crop with high economic value and several applications. In Taiwan, sorghum has been used in the wine industry, and "Kinmen Kaoliang Liquor" is a well-known Asian brand. Fungal contamination is one of the major threats affecting the production of sorghum grain resulting in economic losses as well as human and animal health problems. Several fungal species can infect sorghum grain and generate some toxic secondary metabolites. Epicoccum sorghinum is one of the major fungal contaminants of sorghum grains and a potent producer of mycotoxins such as tenuazonic acid (TeA). However, except for TeA, few studies focused on chemical compounds produced by this fungus. To explore the potential biological and toxic effects of E. sorghinum, a chemical investigation was carried out on the ethyl acetate extract of the fungus because it showed cytotoxic activity against a triple-negative breast cancer cell line, MDA-MB-231 (54.82% inhibition at 20 µg/mL). One new polyketide, epicorepoxydon B (1), along with six known compounds including 4,5-dihydroxy-6-(6'-methylsalicyloxy)-2-hydroxymethyl-2-cyclohexenl-one (2), epicorepoxydon A (3), 3-hydroxybenzyl alcohol (4), 6-methylsalicylic acid (5), gentisyl alcohol (6), and 6-(hydroxymethyl)benzene-1,2,4-triol (7) were obtained, and their structures were established by the interpretation of their MS and NMR spectroscopic data. The cytotoxic activity of all isolated polyketides 1-7 was evaluated, and compounds 2, 6, and 7 exhibited potent activities against A549, HepG2, and MDA-MB-231 human cancer cell lines with IC50 value ranging from 1.86 to 18.31 μM. The structure-activity relationship of the isolated compounds was proposed.
Collapse
Affiliation(s)
- Ching-Chia Chang
- Graduate Institute of Natural Products, College of Pharmacy, Kaohsiung Medical University, Kaohsiung, 807, Taiwan
| | - Chi-Ying Li
- Department of Pharmacology and Pharmaceutical Sciences, School of Pharmacy, University of Southern California, 1985 Zonal Avenue, Los Angeles, CA, 90089, USA
| | - Yi-Hong Tsai
- Graduate Institute of Natural Products, College of Pharmacy, Kaohsiung Medical University, Kaohsiung, 807, Taiwan
| | - Mohamed El-Shazly
- Department of Pharmacognosy, Faculty of Pharmacy, Ain-Shams University, Organization of African Unity Street, Abassia, 11566, Cairo, Egypt
- Department of Pharmaceutical Biology, Faculty of Pharmacy and Biotechnology, The German University in Cairo, Cairo, 11835, Egypt
| | - Chien-Kei Wei
- Graduate Institute of Natural Products, College of Pharmacy, Kaohsiung Medical University, Kaohsiung, 807, Taiwan
| | - Zih-Jie Yang
- Graduate Institute of Natural Products, College of Pharmacy, Kaohsiung Medical University, Kaohsiung, 807, Taiwan
| | - Shu-Li Chen
- Graduate Institute of Natural Products, College of Pharmacy, Kaohsiung Medical University, Kaohsiung, 807, Taiwan
| | - Chin-Chung Wu
- Graduate Institute of Natural Products, College of Pharmacy, Kaohsiung Medical University, Kaohsiung, 807, Taiwan
| | - Yang-Chang Wu
- Graduate Institute of Integrated Medicine, China Medical University, Taichung, 404, Taiwan
- Chinese Medicine Research and Development Center, China Medical University Hospital, Taichung, 404, Taiwan
| | - Fang-Rong Chang
- Graduate Institute of Natural Products, College of Pharmacy, Kaohsiung Medical University, Kaohsiung, 807, Taiwan.
- Drug Development and Value Creation Research Center, Kaohsiung Medical University, Kaohsiung, 807, Taiwan.
- Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, 807, Taiwan.
- Department of Marine Biotechnology and Resources, National Sun Yat-sen University, Kaohsiung, 804, Taiwan.
| |
Collapse
|
11
|
Poliseno V, Chaves S, Brunetti L, Loiodice F, Carrieri A, Laghezza A, Tortorella P, Magalhães JD, Cardoso SM, Santos MA, Piemontese L. Derivatives of Tenuazonic Acid as Potential New Multi-Target Anti-Alzheimer's Disease Agents. Biomolecules 2021; 11:111. [PMID: 33467709 PMCID: PMC7830597 DOI: 10.3390/biom11010111] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 01/12/2021] [Accepted: 01/13/2021] [Indexed: 12/17/2022] Open
Abstract
Alzheimer's disease (AD) is generally recognized as a multifactorial neurodegenerative pathology with an increasing impact on society. Tenuazonic acid (TA) is a natural compound that was recently identified as a potential multitarget ligand with anti-cholinesterase, anti-amyloidogenic and antioxidant activities. Using its structure as a chemical scaffold, we synthesized and evaluated new derivatives (1-5), including tenuazonic-donepezil (TA-DNP) hybrids (4 and 5) due to the clinical importance of the anti-AD drug donepezil. These novel compounds all achieved activity in the micromolar range towards all selected targets and demonstrated to be potentially orally absorbed. Moreover, a selected compound (1) was further investigated as a chelating agent towards copper (II), zinc (II) and iron (III) and showed good chelating ability (pFe = 16.6, pCu = 11.6, pZn = 6.0 at pH 7.4). Therefore, the TA motif can be considered an interesting building block in the search for innovative multi-functional anti-neurodegenerative drugs, as exemplified by hybrid 5, a promising non-cytotoxic lead compound adequate for the early stages of AD, and capable of ameliorating the oxidative status of SH-SY5Y human neuroblastoma cells.
Collapse
Affiliation(s)
- Viviana Poliseno
- Department of Pharmacy and Pharmaceutical Sciences, University of Bari “A. Moro”, via E. Orabona 4, 70125 Bari, Italy; (V.P.); (L.B.); (F.L.); (A.C.); (A.L.); (P.T.)
- Centro de Química Estrutural and Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;
| | - Sílvia Chaves
- Centro de Química Estrutural and Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;
| | - Leonardo Brunetti
- Department of Pharmacy and Pharmaceutical Sciences, University of Bari “A. Moro”, via E. Orabona 4, 70125 Bari, Italy; (V.P.); (L.B.); (F.L.); (A.C.); (A.L.); (P.T.)
| | - Fulvio Loiodice
- Department of Pharmacy and Pharmaceutical Sciences, University of Bari “A. Moro”, via E. Orabona 4, 70125 Bari, Italy; (V.P.); (L.B.); (F.L.); (A.C.); (A.L.); (P.T.)
| | - Antonio Carrieri
- Department of Pharmacy and Pharmaceutical Sciences, University of Bari “A. Moro”, via E. Orabona 4, 70125 Bari, Italy; (V.P.); (L.B.); (F.L.); (A.C.); (A.L.); (P.T.)
| | - Antonio Laghezza
- Department of Pharmacy and Pharmaceutical Sciences, University of Bari “A. Moro”, via E. Orabona 4, 70125 Bari, Italy; (V.P.); (L.B.); (F.L.); (A.C.); (A.L.); (P.T.)
| | - Paolo Tortorella
- Department of Pharmacy and Pharmaceutical Sciences, University of Bari “A. Moro”, via E. Orabona 4, 70125 Bari, Italy; (V.P.); (L.B.); (F.L.); (A.C.); (A.L.); (P.T.)
| | - João D. Magalhães
- CNC—Center for Neuroscience and Cell Biology, University of Coimbra, 3004-504 Coimbra, Portugal; (J.D.M.); (S.M.C.)
| | - Sandra M. Cardoso
- CNC—Center for Neuroscience and Cell Biology, University of Coimbra, 3004-504 Coimbra, Portugal; (J.D.M.); (S.M.C.)
- Institute of Molecular and Cell Biology, Faculty of Medicine, University of Coimbra, 3000-548 Coimbra, Portugal
| | - M. Amélia Santos
- Centro de Química Estrutural and Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;
| | - Luca Piemontese
- Department of Pharmacy and Pharmaceutical Sciences, University of Bari “A. Moro”, via E. Orabona 4, 70125 Bari, Italy; (V.P.); (L.B.); (F.L.); (A.C.); (A.L.); (P.T.)
| |
Collapse
|
12
|
Development of a Monoclonal Antibody-Based ELISA for the Detection of Alternaria Mycotoxin Tenuazonic Acid in Food Samples. FOOD ANAL METHOD 2020. [DOI: 10.1007/s12161-020-01780-w] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
|
13
|
Li J, Chen M, Hao X, Li S, Li F, Yu L, Xiao C, Gan M. Structural Revision and Absolute Configuration of Burnettramic Acid A. Org Lett 2019; 22:98-101. [DOI: 10.1021/acs.orglett.9b04008] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jiao Li
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People’s Republic of China
| | - Minghua Chen
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People’s Republic of China
| | - Xiaomeng Hao
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People’s Republic of China
| | - Shasha Li
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People’s Republic of China
| | - Fang Li
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People’s Republic of China
| | - Liyan Yu
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People’s Republic of China
| | - Chunling Xiao
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People’s Republic of China
| | - Maoluo Gan
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People’s Republic of China
| |
Collapse
|
14
|
Hossain MZ, Maragos CM. Coordination of mycotoxins with lanthanides in luminescent complexes. Mycotoxin Res 2019; 35:279-292. [PMID: 30949954 DOI: 10.1007/s12550-019-00356-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 03/08/2019] [Accepted: 03/15/2019] [Indexed: 12/01/2022]
Abstract
The ability of several chelating mycotoxins to form coordination complexes with the lanthanide metals europium and terbium was explored. The mycotoxins examined included ochratoxin A, citrinin, cyclopiazonic acid (CPA), kojic acid, and tenuazonic acid (TeA). Of these compounds, TeA and CPA resulted in the greatest luminescence. Parameters influencing luminescence of TeA were investigated further. These included the type of lanthanide and its concentration, certain environmental factors, and the effect of competing metal cations. Of the two lanthanide metals, the terbium coordination complex (TeA-Tb3+) showed greater luminescence relative to the europium complex (TeA-Eu3+). The effects of solvent type, water content, and pH on the TeA-Tb3+ system suggested that optimal conditions for luminescence were in 90% methanol with 10% aqueous buffer at pH 3. In competitive assays, the luminescence of the TeA-Tb3+ complex decreased as the concentration of competing metal cations increased. Among the cations tested, Cu2+ was the best inhibitor followed by Al3+, Au3+, Fe3+, Co2+, Mn2+, Mg2+, and Ca2+. Two cations, Na+ and K+, showed no significant inhibition. This is the first report to describe the coordination of the metal-chelating mycotoxin TeA with lanthanides and the ability of TeA to serve as an "antenna" for the efficient transfer of energy to the lanthanide with resulting luminescence. Understanding the ability of mycotoxins such as TeA to chelate metals provides insight into how they exert their toxic effects.
Collapse
Affiliation(s)
- Md Zakir Hossain
- Mycotoxin Prevention and Applied Microbiology Research Unit, Agricultural Research Service, US Department of Agriculture, National Center for Agricultural Utilization Research, Peoria, IL, 61604, USA
| | - Chris M Maragos
- Mycotoxin Prevention and Applied Microbiology Research Unit, Agricultural Research Service, US Department of Agriculture, National Center for Agricultural Utilization Research, Peoria, IL, 61604, USA.
| |
Collapse
|
15
|
Fluorescence Polarization Immunoassay for Alternaria Mycotoxin Tenuazonic Acid Detection and Molecular Modeling Studies of Antibody Recognition. FOOD ANAL METHOD 2018. [DOI: 10.1007/s12161-018-1236-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
16
|
|
17
|
Mousa WK, Schwan A, Davidson J, Strange P, Liu H, Zhou T, Auzanneau FI, Raizada MN. An endophytic fungus isolated from finger millet (Eleusine coracana) produces anti-fungal natural products. Front Microbiol 2015; 6:1157. [PMID: 26539183 PMCID: PMC4612689 DOI: 10.3389/fmicb.2015.01157] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Accepted: 10/05/2015] [Indexed: 12/29/2022] Open
Abstract
Finger millet is an ancient African cereal crop, domesticated 7000 years ago in Ethiopia, reaching India at 3000 BC. Finger millet is reported to be resistant to various fungal pathogens including Fusarium sp. We hypothesized that finger millet may host beneficial endophytes (plant-colonizing microbes) that contribute to the antifungal activity. Here we report the first isolation of endophyte(s) from finger millet. Five distinct fungal species were isolated from roots and predicted taxonomically based on 18S rDNA sequencing. Extracts from three putative endophytes inhibited growth of F. graminearum and three other pathogenic Fusarium species. The most potent anti-Fusarium strain (WF4, predicted to be a Phoma sp.) was confirmed to behave as an endophyte using pathogenicity and confocal microscopy experiments. Bioassay-guided fractionation of the WF4 extract identified four anti-fungal compounds, viridicatol, tenuazonic acid, alternariol, and alternariol monomethyl ether. All the purified compounds caused dramatic breakage of F. graminearum hyphae in vitro. These compounds have not previously been reported to have anti-Fusarium activity. None of the compounds, except for tenuazonic acid, have previously been reported to be produced by Phoma. We conclude that the ancient, disease-tolerant crop, finger millet, is a novel source of endophytic anti-fungal natural products. This paper suggests the value of the crops grown by subsistence farmers as sources of endophytes and their natural products. Application of these natural chemicals to solve real world problems will require further validation.
Collapse
Affiliation(s)
- Walaa K. Mousa
- Department of Plant Agriculture, University of GuelphGuelph, ON, Canada
- Department of Pharmacognosy, Mansoura UniversityMansoura, Egypt
| | - Adrian Schwan
- Department of Chemistry, University of GuelphGuelph, ON, Canada
| | | | - Philip Strange
- Agriculture and Agri-Food Canada, Guelph Food Research CentreGuelph, ON, Canada
| | - Huaizhi Liu
- Agriculture and Agri-Food Canada, Guelph Food Research CentreGuelph, ON, Canada
| | - Ting Zhou
- Agriculture and Agri-Food Canada, Guelph Food Research CentreGuelph, ON, Canada
| | | | - Manish N. Raizada
- Department of Plant Agriculture, University of GuelphGuelph, ON, Canada
| |
Collapse
|
18
|
Tölgyesi Á, Stroka J, Tamosiunas V, Zwickel T. Simultaneous analysis of Alternaria toxins and citrinin in tomato: an optimised method using liquid chromatography-tandem mass spectrometry. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2015; 32:1512-22. [PMID: 26212568 PMCID: PMC4673541 DOI: 10.1080/19440049.2015.1072644] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Accepted: 07/07/2015] [Indexed: 10/25/2022]
Abstract
Alternaria toxins and citrinin are mycotoxins produced by fungi growing on different raw materials and agricultural commodities. Maximum levels of these toxins in foods are currently under consideration by the European Commission as a risk management measure. In this study, a new quantitative method is described for the determination of five Alternaria toxins and citrinin in tomato and tomato juice samples based on LC-MS/MS detection. Samples were extracted with pure methanol, followed by a derivatisation step with 2,4-dinitrophenylhydrazine to improve the determination of tenuazonic acid and to decrease the wide polarity difference between the compounds of interest. Samples were purified on hydrophilic-modified styrene polymer solid-phase extraction cartridges. High-performance liquid chromatographic columns packed with different core-shell materials were tested for the separation of toxins and a C-18 phase was in the final method applied to achieve sufficient separation of all relevant analytes. A key element of this approach was to prove successful transferability of the method to three different triple quadrupole mass spectrometers. A full single laboratory method validation was performed on two LC-MS/MS systems and performance characteristics met the predefined requirements. Moreover, the method was used in an international proficiency test and the satisfactory z-scores obtained (-0.1 to 0.8 in tomato juice samples) demonstrated the reliability of the approach described. The method will be validated in an inter-laboratory collaborative study and if the criteria for method precision are met, the method will be proposed as a new Work Item to the European Committee for Standardisation.
Collapse
Affiliation(s)
- Ádám Tölgyesi
- European Commission, Directorate-General Joint Research Centre, Institute for Reference Materials and Measurements, Geel, Belgium
| | - Joerg Stroka
- European Commission, Directorate-General Joint Research Centre, Institute for Reference Materials and Measurements, Geel, Belgium
| | - Vytautas Tamosiunas
- European Commission, Directorate-General Joint Research Centre, Institute for Reference Materials and Measurements, Geel, Belgium
- National Food and Veterinary Risk Assessment Institute, Vilnius, Lithuania
| | - Theresa Zwickel
- BfR Federal Institute for Risk Assessment, Department of Safety in the Food Chain, Berlin, Germany
| |
Collapse
|
19
|
Appell M, Bosma WB. Assessment of the electronic structure and properties of trichothecene toxins using density functional theory. JOURNAL OF HAZARDOUS MATERIALS 2015; 288:113-123. [PMID: 25698572 DOI: 10.1016/j.jhazmat.2015.01.051] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2014] [Revised: 01/17/2015] [Accepted: 01/21/2015] [Indexed: 06/04/2023]
Abstract
A comprehensive quantum chemical study was carried out on 35 type A and B trichothecenes and biosynthetic precursors, including selected derivatives of deoxynivalenol and T-2 toxin. Quantum chemical properties, Natural Bond Orbital (NBO) analysis, and molecular parameters were calculated on structures geometry optimized at the B3LYP/6-311+G** level. Type B trichothecenes possessed significantly larger electrophilicity index compared to the type A trichothecenes studied. Certain hydroxyl groups of deoxynivalenol, nivalenol, and T-2 toxin exhibited considerable rotation during molecular dynamics simulations (5 ps) at the B3LYP/6-31G** level in implicit aqueous solvent. Quantitative structure activity relationship (QSAR) models were developed to evaluate toxicity and detection using genetic algorithm, principal component, and multilinear analyses. The models suggest electronegativity and several 2-dimensional topological descriptors contain important information related to trichothecene cytotoxicity, phytotoxicity, immunochemical detection, and cross-reactivity.
Collapse
Affiliation(s)
- Michael Appell
- Bacterial Foodborne Pathogens and Mycology Research USDA, ARS, National Center for Agricultural Utilization Research 1815 N. University St., Peoria, IL 61604, USA.
| | - Wayne B Bosma
- Mund-Lagowski Department of Chemistry and Biochemistry Bradley University 1501 W. Bradley Ave., Peoria, IL 61625, USA.
| |
Collapse
|
20
|
Shang Z, Li L, Espósito BP, Salim AA, Khalil ZG, Quezada M, Bernhardt PV, Capon RJ. New PKS-NRPS tetramic acids and pyridinone from an Australian marine-derived fungus, Chaunopycnis sp. Org Biomol Chem 2015; 13:7795-802. [DOI: 10.1039/c5ob01058f] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Marine-derived fungus Chaunopycnis sp. yielded the tetramic acid F-14329 (1) and new analogues, chaunolidines A–C (2–4), together with the new pyridinone chaunolidone A (5), and pyridoxatin (6).
Collapse
Affiliation(s)
- Zhuo Shang
- Institute for Molecular Bioscience
- The University of Queensland
- Brisbane
- Australia
| | - Li Li
- Beijing Key Laboratory of Active Substances Discovery and Druggability Evaluation
- Institute of Materia Medica
- Chinese Academy of Medical Sciences & Peking Union Medical College
- Beijing 100050
- China
| | | | - Angela A. Salim
- Institute for Molecular Bioscience
- The University of Queensland
- Brisbane
- Australia
| | - Zeinab G. Khalil
- Institute for Molecular Bioscience
- The University of Queensland
- Brisbane
- Australia
| | - Michelle Quezada
- Institute for Molecular Bioscience
- The University of Queensland
- Brisbane
- Australia
| | - Paul V. Bernhardt
- School of Chemistry and Molecular Biosciences
- The University of Queensland
- Brisbane
- Australia
| | - Robert J. Capon
- Institute for Molecular Bioscience
- The University of Queensland
- Brisbane
- Australia
| |
Collapse
|
21
|
Mikula H, Svatunek D, Skrinjar P, Horkel E, Hametner C, Fröhlich J. DFT study of the Lewis acid mediated synthesis of 3-acyltetramic acids. J Mol Model 2014; 20:2181. [PMID: 24794137 DOI: 10.1007/s00894-014-2181-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Accepted: 02/11/2014] [Indexed: 11/28/2022]
Abstract
The synthesis of 3-acyltetramic acids by C-acylation of pyrrolidine-2,4-diones was studied by density functional theory (DFT). DFT was applied to the mycotoxin tenuazonic acid (TeA), an important representative of these bioactive natural compounds. Lewis acid mediated C-acylation in combination with previous pH-neutral domino N-acylation-Wittig cyclization can be used for the efficient preparation of 3-acyltetramic acids. Nevertheless, quite harsh conditions are still required to carry out this synthetic step, leading to unwanted isomerization of stereogenic centers in some cases. In the presented study, the reaction pathway for the C-acetylation of (5S,6S-5-s-butylpyrrolidine-2,4-dione was studied in terms of mechanism, solvent effects, and Lewis acid activation, in order to obtain an appropriate theoretical model for further investigations. Crucial steps were identified that showed rather high activation barriers and rationalized previously reported experimental discoveries. After in silico optimization, aluminum chlorides were found to be promising Lewis acids that promote the C-acylation of pyrrolidine-2,4-diones, whereas calculations performed in various organic solvents showed that the solvent had only a minor effect on the energy profiles of the considered mechanisms. This clearly indicates that further synthetic studies should focus on the Lewis-acidic mediator rather than other reaction parameters. Additionally, given the results obtained for different reaction routes, the stereochemistry of this C-acylation is discussed. It is assumed that the formation of Z-configured TeA is favored, in good agreement with our previous studies.
Collapse
Affiliation(s)
- Hannes Mikula
- Institute of Applied Synthetic Chemistry, Vienna University of Technology, 1060, Vienna, Austria,
| | | | | | | | | | | |
Collapse
|
22
|
Kyeremeh K, Acquah KS, Sazak A, Houssen W, Tabudravu J, Deng H, Jaspars M. Butremycin, the 3-hydroxyl derivative of ikarugamycin and a protonated aromatic tautomer of 5'-methylthioinosine from a Ghanaian Micromonospora sp. K310. Mar Drugs 2014; 12:999-1012. [PMID: 24534843 PMCID: PMC3944527 DOI: 10.3390/md12020999] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2013] [Revised: 12/24/2013] [Accepted: 01/21/2014] [Indexed: 11/16/2022] Open
Abstract
A new actinomycete strain Micromonospora sp. K310 was isolated from Ghanaian mangrove river sediment. Spectroscopy-guided fractionation led to the isolation of two new compounds from the fermentation culture. One of the compounds is butremycin (2) which is the (3-hydroxyl) derivative of the known Streptomyces metabolite ikarugamycin (1) and the other compound is a protonated aromatic tautomer of 5′-methylthioinosine (MTI) (3). Both new compounds were characterized by 1D, 2D NMR and MS data. Butremycin (2) displayed weak antibacterial activity against Gram-positive S. aureus ATCC 25923, the Gram-negative E. coli ATCC 25922 and a panel of clinical isolates of methicillin-resistant S. aureus (MRSA) strains while 3 did not show any antibacterial activity against these microbes.
Collapse
Affiliation(s)
- Kwaku Kyeremeh
- Marine and Plant Laboratory of Ghana, Department of Chemistry, University of Ghana, Accra, P.O. Box LG 56, Ghana.
| | - Kojo Sekyi Acquah
- Marine and Plant Laboratory of Ghana, Department of Chemistry, University of Ghana, Accra, P.O. Box LG 56, Ghana.
| | - Anil Sazak
- Department of Biology, Faculty of Art and Science, Ondokuz Mayis University, Kurupelit Samsun 55139, Turkey.
| | - Wael Houssen
- Marine Biodiscovery Centre, Department of Chemistry, University of Aberdeen, Old Aberdeen AB24 3UE, Scotland, UK.
| | - Jioji Tabudravu
- Marine Biodiscovery Centre, Department of Chemistry, University of Aberdeen, Old Aberdeen AB24 3UE, Scotland, UK.
| | - Hai Deng
- Marine Biodiscovery Centre, Department of Chemistry, University of Aberdeen, Old Aberdeen AB24 3UE, Scotland, UK.
| | - Marcel Jaspars
- Marine Biodiscovery Centre, Department of Chemistry, University of Aberdeen, Old Aberdeen AB24 3UE, Scotland, UK.
| |
Collapse
|
23
|
Singh DK, Ganbold EO, Cho EM, Cho KH, Kim D, Choo J, Kim S, Lee CM, Yang SI, Joo SW. Detection of the mycotoxin citrinin using silver substrates and Raman spectroscopy. JOURNAL OF HAZARDOUS MATERIALS 2014; 265:89-95. [PMID: 24333945 DOI: 10.1016/j.jhazmat.2013.11.041] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2013] [Revised: 10/20/2013] [Accepted: 11/19/2013] [Indexed: 06/03/2023]
Abstract
We detected a trace amount of the mycotoxin citrinin using surface-enhanced Raman scattering (SERS) on silver nanoparticle (Ag NP) surfaces. The SERS substrate on hydrophobic Teflon films was also introduced to observe the citrinin peaks. A broad band at ∼1382cm(-1), which was ascribed to the symmetric carboxylate stretching mode, was observed in addition to an antisymmetric carboxylate stretching mode at ∼1568cm(-1) in the Raman spectra. The spectral feature indicated that citrinin would adsorb on Ag NPs via its carboxylate form. Based on density functional theory (DFT) calculations, vibrational mode analysis was performed to compare the Raman spectra of citrinin. DFT calculations also predicted that a bidentate bridge configuration through O15 and O16 atoms in citrinin would be the most stable on three Ag atoms. After treating with Ag NPs, observation of citrinin peaks was attempted in fungal cells of Penicillium citrinum. This work may provide useful insights into the direct observation of the hazardous citrinin mycotoxin using SERS by understanding its adsorption behaviors on Ag surfaces.
Collapse
Affiliation(s)
- Dheeraj K Singh
- Department of Chemistry, Soongsil University, Seoul 156-743, South Korea
| | | | - Eun-Min Cho
- College of Environment and Applied Chemistry, Kyung Hee University, Yongin 446-701, South Korea
| | - Kwang-Hwi Cho
- School of Systems Biomedical Science, Soongsil University, Sangdo-dong, Dongjak-gu, Seoul, South Korea
| | - Doseok Kim
- Department of Physics, Sogang University, Seoul 121-742, South Korea
| | - Jaebum Choo
- Department of Bionano Engineering, Hanyang University, Sa-1-dong 1271, Ansan 426-791, South Korea
| | - Sehun Kim
- Molecular-level Interface Research Center and Department of Chemistry, KAIST, Daejeon 305-701, South Korea
| | - Cheol Min Lee
- Institute of Environmental and Industrial Medicine, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, South Korea.
| | - Sung Ik Yang
- College of Environment and Applied Chemistry, Kyung Hee University, Yongin 446-701, South Korea.
| | - Sang-Woo Joo
- Department of Chemistry, Soongsil University, Seoul 156-743, South Korea.
| |
Collapse
|