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Plaszkó T, Szűcs Z, Vasas G, Gonda S. Interactions of fungi with non-isothiocyanate products of the plant glucosinolate pathway: A review on product formation, antifungal activity, mode of action and biotransformation. PHYTOCHEMISTRY 2022; 200:113245. [PMID: 35623473 DOI: 10.1016/j.phytochem.2022.113245] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 05/02/2022] [Accepted: 05/12/2022] [Indexed: 05/05/2023]
Abstract
The glucosinolate pathway, which is present in the order Brassicales, is one of the most researched defensive natural product biosynthesis pathways. Its core molecules, the glucosinolates are broken down upon pathogen challenge or tissue damage to yield an array of natural products that may help plants defend against the stressor. Though the most widely known glucosinolate decomposition products are the antimicrobial isothiocyanates, there is a wide range of other volatile and non-volatile natural products that arise from this biosynthetic pathway. This review summarizes our current knowledge on the interaction of these much less examined, non-isothiocyanate products with fungi. It deals with compounds including (1) glucosinolates and their biosynthesis precursors; (2) glucosinolate-derived nitriles (e.g. derivatives of 1H-indole-3-acetonitrile), thiocyanates, epithionitriles and oxazolidine-2-thiones; (3) putative isothiocyanate downstream products such as raphanusamic acid, 1H-indole-3-methanol (= indole-3-carbinol) and its oligomers, 1H-indol-3-ylmethanamine and ascorbigen; (4) 1H-indole-3-acetonitrile downstream products such as 1H-indole-3-carbaldehyde (indole-3-carboxaldehyde), 1H-indole-3-carboxylic acid and their derivatives; and (5) indole phytoalexins including brassinin, cyclobrassinin and brassilexin. Herein, a literature review on the following aspects is provided: their direct antifungal activity and the proposed mechanisms of antifungal action, increased biosynthesis after fungal challenge, as well as data on their biotransformation/detoxification by fungi, including but not limited to fungal myrosinase activity.
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Affiliation(s)
- Tamás Plaszkó
- Department of Botany, Division of Pharmacognosy, University of Debrecen, Egyetem tér 1, 4032, Debrecen, Hungary; Doctoral School of Pharmaceutical Sciences, University of Debrecen, 4032, Debrecen, Hungary.
| | - Zsolt Szűcs
- Department of Botany, Division of Pharmacognosy, University of Debrecen, Egyetem tér 1, 4032, Debrecen, Hungary; Healthcare Industry Institute, University of Debrecen, 4032, Debrecen, Hungary.
| | - Gábor Vasas
- Department of Botany, Division of Pharmacognosy, University of Debrecen, Egyetem tér 1, 4032, Debrecen, Hungary.
| | - Sándor Gonda
- Department of Botany, Division of Pharmacognosy, University of Debrecen, Egyetem tér 1, 4032, Debrecen, Hungary.
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Quiroga D, Becerra LD, Sadat-Bernal J, Vargas N, Coy-Barrera E. Synthesis and Antifungal Activity against Fusarium oxysporum of Some Brassinin Analogs Derived from l-tryptophan: A DFT/B3LYP Study on the Reaction Mechanism. Molecules 2016; 21:molecules21101349. [PMID: 27727186 PMCID: PMC6273850 DOI: 10.3390/molecules21101349] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Revised: 09/26/2016] [Accepted: 10/08/2016] [Indexed: 11/18/2022] Open
Abstract
An efficient methodology to obtain novel antifungal analogs of brassinin 1 is described. Starting from l-tryptophan 2, N,N′-dialkylthiourea 4, 4-[(1H-indol-3-yl)methylene]-2-sulfanylidene-1,3-thiazolidin-5-one 5 and alkyl (2S)-3-(1H-indol-3-yl)-2-{[(alkylsulfanyl)carbonothioyl]amino}propanoate 6 type compounds were obtained as main products in different ratios depending on the reaction conditions via a tandem dithiocarbamate formation and Michael addition reaction. In order to understand the dependence of the reaction conditions on the mechanism pathway, a DFT/B3LYP study was performed. The results suggested the existence of competitive mechanistic routes which involve the presence of an ionic dithiocarbamate intermediate 9. Antifungal activities of all products were then evaluated against Fusarium oxysporum through mycelial growth inhibition using a microscale amended-medium assay. IC50 values were thus determined for each compound. These results showed that 6-related compounds can be considered as promissory antifungal agents.
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Affiliation(s)
- Diego Quiroga
- Bioorganic Chemistry Laboratory, Facultad de Ciencias Básicas y Aplicadas, Universidad Militar Nueva Granada, Campus Nueva Granada, Cajicá 49300, Colombia.
| | - Lili Dahiana Becerra
- Bioorganic Chemistry Laboratory, Facultad de Ciencias Básicas y Aplicadas, Universidad Militar Nueva Granada, Campus Nueva Granada, Cajicá 49300, Colombia.
| | - John Sadat-Bernal
- Bioorganic Chemistry Laboratory, Facultad de Ciencias Básicas y Aplicadas, Universidad Militar Nueva Granada, Campus Nueva Granada, Cajicá 49300, Colombia.
| | - Nathalia Vargas
- Bioorganic Chemistry Laboratory, Facultad de Ciencias Básicas y Aplicadas, Universidad Militar Nueva Granada, Campus Nueva Granada, Cajicá 49300, Colombia.
| | - Ericsson Coy-Barrera
- Bioorganic Chemistry Laboratory, Facultad de Ciencias Básicas y Aplicadas, Universidad Militar Nueva Granada, Campus Nueva Granada, Cajicá 49300, Colombia.
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A convenient synthesis of 3-formyl-2-thioacetamide-indole derivatives via the one-pot reaction of indolin-2-thiones, isocyanides and chloroacetylchloride. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.11.044] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Nongbri PL, Vahabi K, Mrozinska A, Seebald E, Sun C, Sherameti I, Johnson JM, Oelmüller R. Balancing defense and growth—Analyses of the beneficial symbiosis between Piriformospora indica and Arabidopsis thaliana. Symbiosis 2013. [DOI: 10.1007/s13199-012-0209-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Stotz HU, Sawada Y, Shimada Y, Hirai MY, Sasaki E, Krischke M, Brown PD, Saito K, Kamiya Y. Role of camalexin, indole glucosinolates, and side chain modification of glucosinolate-derived isothiocyanates in defense of Arabidopsis against Sclerotinia sclerotiorum. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2011; 67:81-93. [PMID: 21418358 DOI: 10.1111/j.1365-313x.2011.04578.x] [Citation(s) in RCA: 124] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Plant secondary metabolites are known to facilitate interactions with a variety of beneficial and detrimental organisms, yet the contribution of specific metabolites to interactions with fungal pathogens is poorly understood. Here we show that, with respect to aliphatic glucosinolate-derived isothiocyanates, toxicity against the pathogenic ascomycete Sclerotinia sclerotiorum depends on side chain structure. Genes associated with the formation of the secondary metabolites camalexin and glucosinolate were induced in Arabidopsis thaliana leaves challenged with the necrotrophic pathogen S. sclerotiorum. Unlike S. sclerotiorum, the closely related ascomycete Botrytis cinerea was not identified to induce genes associated with aliphatic glucosinolate biosynthesis in pathogen-challenged leaves. Mutant plant lines deficient in camalexin, indole, or aliphatic glucosinolate biosynthesis were hypersusceptible to S. sclerotiorum, among them the myb28 mutant, which has a regulatory defect resulting in decreased production of long-chained aliphatic glucosinolates. The antimicrobial activity of aliphatic glucosinolate-derived isothiocyanates was dependent on side chain elongation and modification, with 8-methylsulfinyloctyl isothiocyanate being most toxic to S. sclerotiorum. This information is important for microbial associations with cruciferous host plants and for metabolic engineering of pathogen defenses in cruciferous plants that produce short-chained aliphatic glucosinolates.
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Affiliation(s)
- Henrik U Stotz
- RIKEN Plant Science Center, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan.
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Yttrium triflate-catalyzed efficient chemoselective S-benzylation of indoline-2-thiones using benzyl alcohols. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2010.11.163] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Pedras MSC, Minic Z, Sarma-Mamillapalle VK. Brassinin oxidase mediated transformation of the phytoalexin brassinin: structure of the elusive co-product, deuterium isotope effect and stereoselectivity. Bioorg Med Chem 2011; 19:1390-9. [PMID: 21292494 DOI: 10.1016/j.bmc.2011.01.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2010] [Revised: 01/04/2011] [Accepted: 01/07/2011] [Indexed: 11/24/2022]
Abstract
Brassinin oxidase, a fungal detoxifying enzyme that mediates the conversion of the phytoalexin brassinin into indole-3-carboxaldehyde, is the first enzyme described to date that catalyzes the transformation of a dithiocarbamate group into an aldehyde equivalent. Brassinin is an essential phytoalexin due to its antifungal activity and its role as biosynthetic precursor of other phytoalexins produced in plants of the family Brassicaceae (common name crucifer). In this report, the isolation, structure determination and synthesis of the elusive co-product of brassinin transformation by brassinin oxidase, S-methyl dithiocarbamate, the syntheses of dideuterated and (R) and (S) monodeuterated brassinins, kinetic analyses of isotope effects and chemical modifications of brassinin oxidase are described. The reaction of [1'-(2)H(2)]brassinin was found to be slowed by a kinetic isotope effect of 5.3 on the value of k(cat)/K(m). This result indicates that the hydride/hydrogen transfer step preceding brassinin transformation is rate determining in the overall reaction. In addition, the use of (R) and (S)-[1'-(2)H]brassinins as substrates indicated that the hydride/hydrogen transfer step is ca. 88% stereoselective for the pro-R hydrogen. A detailed chemical mechanism of the enzymatic transformation of brassinin is proposed.
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Affiliation(s)
- M Soledade C Pedras
- Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, SK, Canada S7N 5C9.
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Discovery of inhibitors of brassinin oxidase based on the scaffolds of the phytoalexins brassilexin and wasalexin. Bioorg Med Chem 2010; 18:2456-63. [DOI: 10.1016/j.bmc.2010.02.054] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2010] [Revised: 02/22/2010] [Accepted: 02/24/2010] [Indexed: 11/17/2022]
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Pedras MSC, Yu Y. Phytotoxins, Elicitors and Other Secondary Metabolites from Phytopathogenic “Blackleg” Fungi: Structure, Phytotoxicity and Biosynthesis. Nat Prod Commun 2009. [DOI: 10.1177/1934578x0900400927] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The metabolites produced by the fungal species Leptosphaeria maculans and L. biglobosa under different culture conditions, together with their phytotoxic activities are reviewed. In addition, the biosynthetic studies of blackleg metabolites carried out to date are described and suggestions for species reclassification are provided.
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Affiliation(s)
- M. Soledade C. Pedras
- Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, SK, S7N 5C9, Canada
| | - Yang Yu
- Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, SK, S7N 5C9, Canada
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Pedras MSC, Minic Z, Sarma-Mamillapalle VK. Synthetic inhibitors of the fungal detoxifying enzyme brassinin oxidase based on the phytoalexin camalexin scaffold. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2009; 57:2429-2435. [PMID: 19243099 DOI: 10.1021/jf803666s] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Brassinin (1) is an essential phytoalexin produced in plants of the family Brassicaceae (common name crucifer) due to its role as a biosynthetic precursor of other phytoalexins and antimicrobial activity. The dithiocarbamate group of brassinin (1) is the toxophore responsible for its fairly broad antifungal activity. To the detriment of many agriculturally important crops, several pathogenic fungi of crucifers are able to overcome brassinin by detoxification. In this work, inhibitors of brassinin oxidase, a phytoalexin detoxifying enzyme produced by the plant pathogenic fungus Leptosphaeria maculans (asexual stage Phoma lingam ), were synthesized and evaluated. The camalexin scaffold was used for the design of brassinin oxidase inhibitors (i.e., paldoxins, phytoalexin detoxification inhibitors) because camalexin is a phytoalexin not produced by the Brassica species and L. maculans is unable to metabolize it. The inhibitory effect of camalexin and derivatives decreased as follows: 5-methoxycamalexin > 5-fluorocamalexin = 6-methoxycamalexin > camalexin > 6-fluorocamalexin; 5-methoxycamalexin was determined to be the best inhibitor of brassinin oxidase discovered to date. In addition, the results suggested that camalexin might induce fungal pathways protecting L. maculans against oxidative stress (induction of superoxide dismutase) as well as brassinin toxicity (induction of brassinin oxidase). Overall, these results revealed additional biological effects of camalexin and its natural derivatives and emphasized that different phytoalexins could have positive or negative impacts on plant resistance to different fungal pathogens.
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Sexton AC, Minic Z, Cozijnsen AJ, Pedras MSC, Howlett BJ. Cloning, purification and characterisation of brassinin glucosyltransferase, a phytoalexin-detoxifying enzyme from the plant pathogen Sclerotinia sclerotiorum. Fungal Genet Biol 2008; 46:201-9. [PMID: 19041410 DOI: 10.1016/j.fgb.2008.10.014] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2008] [Revised: 10/30/2008] [Accepted: 10/31/2008] [Indexed: 01/24/2023]
Abstract
The plant-pathogenic fungus Sclerotinia sclerotiorum can detoxify cruciferous phytoalexins such as brassinin via glucosylation. Here we describe a multifaceted approach including genome mining, transcriptional induction, phytoalexin quantification, protein expression and enzyme purification that led to identification of a S. sclerotiorum glucosyltransferase that detoxifies brassinin. Transcription of this gene, denoted as brassinin glucosyltransferase 1 (SsBGT1), was induced significantly in response to the cruciferous phytoalexins camalexin, cyclobrassinin, brassilexin, brassinin and 3-phenylindole, a camalexin analogue. This gene was also up-regulated during infection of Brassica napus leaves. Levels of brassinin decreased significantly between 48 and 72h post-inoculation, with a concomitant increase in levels of 1-beta-d-glucopyranosylbrassinin, the product of the reaction catalysed by SsBGT1. These findings strongly implicate the involvement of this gene during infection of B. napus. This gene was cloned and expressed in Saccharomyces cerevisiae. The purified recombinant enzyme was able to glucosylate brassinin and two other phytoalexins, albeit much less effectively. This is the first report of a fungal gene involved in detoxification of plant defence molecules via glucosylation.
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Pedras MSC, Minic Z, Jha M. Brassinin oxidase, a fungal detoxifying enzyme to overcome a plant defense - purification, characterization and inhibition. FEBS J 2008; 275:3691-705. [DOI: 10.1111/j.1742-4658.2008.06513.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Pedras MSC. The chemical ecology of crucifers and their fungal pathogens: Boosting plant defenses and inhibiting pathogen invasion. CHEM REC 2008; 8:109-15. [DOI: 10.1002/tcr.20140] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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