1
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Nguyen NN, Lamotte O, Alsulaiman M, Ruffel S, Krouk G, Berger N, Demolombe V, Nespoulous C, Dang TMN, Aimé S, Berthomieu P, Dubos C, Wendehenne D, Vile D, Gosti F. Reduction in PLANT DEFENSIN 1 expression in Arabidopsis thaliana results in increased resistance to pathogens and zinc toxicity. JOURNAL OF EXPERIMENTAL BOTANY 2023; 74:5374-5393. [PMID: 37326591 DOI: 10.1093/jxb/erad228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Accepted: 06/14/2023] [Indexed: 06/17/2023]
Abstract
Ectopic expression of defensins in plants correlates with their increased capacity to withstand abiotic and biotic stresses. This applies to Arabidopsis thaliana, where some of the seven members of the PLANT DEFENSIN 1 family (AtPDF1) are recognised to improve plant responses to necrotrophic pathogens and increase seedling tolerance to excess zinc (Zn). However, few studies have explored the effects of decreased endogenous defensin expression on these stress responses. Here, we carried out an extensive physiological and biochemical comparative characterization of (i) novel artificial microRNA (amiRNA) lines silenced for the five most similar AtPDF1s, and (ii) a double null mutant for the two most distant AtPDF1s. Silencing of five AtPDF1 genes was specifically associated with increased aboveground dry mass production in mature plants under excess Zn conditions, and with increased plant tolerance to different pathogens - a fungus, an oomycete and a bacterium, while the double mutant behaved similarly to the wild type. These unexpected results challenge the current paradigm describing the role of PDFs in plant stress responses. Additional roles of endogenous plant defensins are discussed, opening new perspectives for their functions.
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Affiliation(s)
- Ngoc Nga Nguyen
- IPSiM, CNRS, INRAE, Institut Agro, Université de Montpellier, 2, Place P. Viala, F-34 060 Montpellier Cedex 2, France
| | - Olivier Lamotte
- Agroécologie, CNRS, INRAE, Institut Agro, Université de Bourgogne, Université Bourgogne-Franche Comté, F-21 000 Dijon, France
| | - Mohanad Alsulaiman
- IPSiM, CNRS, INRAE, Institut Agro, Université de Montpellier, 2, Place P. Viala, F-34 060 Montpellier Cedex 2, France
| | - Sandrine Ruffel
- IPSiM, CNRS, INRAE, Institut Agro, Université de Montpellier, 2, Place P. Viala, F-34 060 Montpellier Cedex 2, France
| | - Gabriel Krouk
- IPSiM, CNRS, INRAE, Institut Agro, Université de Montpellier, 2, Place P. Viala, F-34 060 Montpellier Cedex 2, France
| | - Nathalie Berger
- IPSiM, CNRS, INRAE, Institut Agro, Université de Montpellier, 2, Place P. Viala, F-34 060 Montpellier Cedex 2, France
| | - Vincent Demolombe
- IPSiM, CNRS, INRAE, Institut Agro, Université de Montpellier, 2, Place P. Viala, F-34 060 Montpellier Cedex 2, France
| | - Claude Nespoulous
- IPSiM, CNRS, INRAE, Institut Agro, Université de Montpellier, 2, Place P. Viala, F-34 060 Montpellier Cedex 2, France
| | - Thi Minh Nguyet Dang
- IPSiM, CNRS, INRAE, Institut Agro, Université de Montpellier, 2, Place P. Viala, F-34 060 Montpellier Cedex 2, France
| | - Sébastien Aimé
- Agroécologie, CNRS, INRAE, Institut Agro, Université de Bourgogne, Université Bourgogne-Franche Comté, F-21 000 Dijon, France
| | - Pierre Berthomieu
- IPSiM, CNRS, INRAE, Institut Agro, Université de Montpellier, 2, Place P. Viala, F-34 060 Montpellier Cedex 2, France
| | - Christian Dubos
- IPSiM, CNRS, INRAE, Institut Agro, Université de Montpellier, 2, Place P. Viala, F-34 060 Montpellier Cedex 2, France
| | - David Wendehenne
- Agroécologie, CNRS, INRAE, Institut Agro, Université de Bourgogne, Université Bourgogne-Franche Comté, F-21 000 Dijon, France
| | - Denis Vile
- LEPSE, INRAE, Institut Agro, Université de Montpellier, 2 Place P. Viala, F-34 060 Montpellier Cedex 2, France
| | - Françoise Gosti
- IPSiM, CNRS, INRAE, Institut Agro, Université de Montpellier, 2, Place P. Viala, F-34 060 Montpellier Cedex 2, France
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Djami-Tchatchou AT, Tetorya M, Godwin J, Codjoe JM, Li H, Shah DM. Small Cationic Cysteine-Rich Defensin-Derived Antifungal Peptide Controls White Mold in Soybean. J Fungi (Basel) 2023; 9:873. [PMID: 37754982 PMCID: PMC10532163 DOI: 10.3390/jof9090873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 08/11/2023] [Accepted: 08/22/2023] [Indexed: 09/28/2023] Open
Abstract
White mold disease caused by a necrotrophic ascomycete pathogen Sclerotinia sclerotiorum results in serious economic losses of soybean yield in the USA. Lack of effective genetic resistance to this disease in soybean germplasm and increasing pathogen resistance to fungicides makes white mold difficult to manage. Small cysteine-rich antifungal peptides with multi-faceted modes of action possess potential for development as sustainable spray-on bio-fungicides. We have previously reported that GMA4CG_V6 peptide, a 17-amino acid variant of the MtDef4 defensin-derived peptide GMA4CG containing the active γ-core motif, exhibits potent antifungal activity against the gray mold fungal pathogen Botrytis cinerea in vitro and in planta. GMA4CG_V6 exhibited antifungal activity against an aggressive field isolate of S. sclerotiorum 555 in vitro with an MIC value of 24 µM. At this concentration, internalization of this peptide into fungal cells occurred prior to discernible membrane permeabilization. GMA4CG_V6 markedly reduced white mold disease symptoms when applied to detached soybean leaves, pods, and stems. Its spray application on soybean plants provided robust control of this disease. GMA4CG_V6 at sub-lethal concentrations reduced sclerotia production. It was also non-phytotoxic to soybean plants. Our results demonstrate that GMA4CG_V6 peptide has potential for development as a bio-fungicide for white mold control in soybean.
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Affiliation(s)
| | | | | | | | | | - Dilip M. Shah
- Donald Danforth Plant Science Center, St. Louis, MO 63132, USA; (A.T.D.-T.); (M.T.); (J.G.); (J.M.C.); (H.L.)
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3
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Tetorya M, Li H, Djami‐Tchatchou AT, Buchko GW, Czymmek KJ, Shah DM. Plant defensin MtDef4-derived antifungal peptide with multiple modes of action and potential as a bio-inspired fungicide. MOLECULAR PLANT PATHOLOGY 2023; 24:896-913. [PMID: 37036170 PMCID: PMC10346373 DOI: 10.1111/mpp.13336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2023] [Revised: 02/28/2023] [Accepted: 03/20/2023] [Indexed: 06/19/2023]
Abstract
Chemical fungicides have been instrumental in protecting crops from fungal diseases. However, increasing fungal resistance to many of the single-site chemical fungicides calls for the development of new antifungal agents with novel modes of action (MoA). The sequence-divergent cysteine-rich antifungal defensins with multisite MoA are promising starting templates for design of novel peptide-based fungicides. Here, we experimentally tested such a set of 17-amino-acid peptides containing the γ-core motif of the antifungal plant defensin MtDef4. These designed peptides exhibited antifungal properties different from those of MtDef4. Focused analysis of a lead peptide, GMA4CG_V6, showed that it was a random coil in solution with little or no secondary structure elements. Additionally, it exhibited potent cation-tolerant antifungal activity against the plant fungal pathogen Botrytis cinerea, the causal agent of grey mould disease in fruits and vegetables. Its multisite MoA involved localization predominantly to the plasma membrane, permeabilization of the plasma membrane, rapid internalization into the vacuole and cytoplasm, and affinity for the bioactive phosphoinositides phosphatidylinositol 3-phosphate (PI3P), PI4P, and PI5P. The sequence motif RRRW was identified as a major determinant of the antifungal activity of this peptide. While topical spray application of GMA4CG_V6 on Nicotiana benthamiana and tomato plants provided preventive and curative suppression of grey mould disease symptoms, the peptide was not internalized into plant cells. Our findings open the possibility that truncated and modified defensin-derived peptides containing the γ-core sequence could serve as promising candidates for further development of bio-inspired fungicides.
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Affiliation(s)
| | - Hui Li
- Donald Danforth Plant Science CenterSt LouisMissouriUSA
| | | | - Garry W. Buchko
- Earth and Biological Sciences Directorate, Pacific Northwest National LaboratoryRichlandWashingtonUSA
- School of Molecular BiosciencesWashington State UniversityPullmanWashingtonUSA
| | - Kirk J. Czymmek
- Donald Danforth Plant Science CenterSt LouisMissouriUSA
- Advanced Bioimaging LaboratoryDonald Danforth Plant Science CenterSt LouisMissouriUSA
| | - Dilip M. Shah
- Donald Danforth Plant Science CenterSt LouisMissouriUSA
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Čelakovská J, Čermákova E, Vaňková R, Andrýs C, Krejsek J. Sensitisation to molecular components of fungi in atopic dermatitis patients, the relation to the occurrence of food hypersensitivity reactions. FOOD AGR IMMUNOL 2022. [DOI: 10.1080/09540105.2022.2074968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Affiliation(s)
- J. Čelakovská
- Department of Dermatology and Venereology, Faculty Hospital and Medical Faculty of Charles University, Hradec Králové, Czech Republic
| | - E. Čermákova
- Department of Medical Biophysics, Medical Faculty of Charles University, Hradec Králové, Czech republic
| | - R. Vaňková
- Department of Clinical Immunology and Allergy, Faculty Hospital and Medical Faculty of Charles University, Hradec Králové, Czech Republic
| | - C. Andrýs
- Department of Clinical Immunology and Allergy, Faculty Hospital and Medical Faculty of Charles University, Hradec Králové, Czech Republic
| | - J. Krejsek
- Department of Clinical Immunology and Allergy, Faculty Hospital and Medical Faculty of Charles University, Hradec Králové, Czech Republic
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Lopes BS, Hanafiah A, Nachimuthu R, Muthupandian S, Md Nesran ZN, Patil S. The Role of Antimicrobial Peptides as Antimicrobial and Antibiofilm Agents in Tackling the Silent Pandemic of Antimicrobial Resistance. Molecules 2022; 27:molecules27092995. [PMID: 35566343 PMCID: PMC9105241 DOI: 10.3390/molecules27092995] [Citation(s) in RCA: 1] [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: 02/27/2022] [Revised: 04/28/2022] [Accepted: 04/29/2022] [Indexed: 01/11/2023] Open
Abstract
Just over a million people died globally in 2019 due to antibiotic resistance caused by ESKAPE pathogens (Enterococcus faecium, Staphylococcus aureus, Klebsiella pneumoniae, Acinetobacter baumannii, Pseudomonas aeruginosa, and Enterobacter species). The World Health Organization (WHO) also lists antibiotic-resistant Campylobacter and Helicobacter as bacteria that pose the greatest threat to human health. As it is becoming increasingly difficult to discover new antibiotics, new alternatives are needed to solve the crisis of antimicrobial resistance (AMR). Bacteria commonly found in complex communities enclosed within self-produced matrices called biofilms are difficult to eradicate and develop increased stress and antimicrobial tolerance. This review summarises the role of antimicrobial peptides (AMPs) in combating the silent pandemic of AMR and their application in clinical medicine, focusing on both the advantages and disadvantages of AMPs as antibiofilm agents. It is known that many AMPs display broad-spectrum antimicrobial activities, but in a variety of organisms AMPs are not stable (short half-life) or have some toxic side effects. Hence, it is also important to develop new AMP analogues for their potential use as drug candidates. The use of one health approach along with developing novel therapies using phages and breakthroughs in novel antimicrobial peptide synthesis can help us in tackling the problem of AMR.
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Affiliation(s)
- Bruno S. Lopes
- Department of Medical Microbiology, School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Aberdeen AB25 2ZD, UK
- Correspondence: (B.S.L.); (A.H.)
| | - Alfizah Hanafiah
- Department of Medical Microbiology and Immunology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur 56000, Malaysia;
- Correspondence: (B.S.L.); (A.H.)
| | - Ramesh Nachimuthu
- Antibiotic Resistance and Phage Therapy Laboratory, Department of Biomedical Sciences, Vellore Institute of Technology, School of Bioscience and Technology, Vellore 632014, India;
| | - Saravanan Muthupandian
- AMR and Nanotherapeutics Laboratory, Department of Pharmacology, Saveetha Institute of Medical and Technical Sciences, Saveetha Dental College, Chennai 600077, India;
| | - Zarith Nameyrra Md Nesran
- Department of Medical Microbiology and Immunology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur 56000, Malaysia;
| | - Sandip Patil
- Department of Hematology and Oncology, Shenzhen Children’s Hospital, Shenzhen 518038, China;
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6
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Chen J, Liu Z, Liu Y, Zhang X, Zeng J. Preliminary investigations on the pathogenesis-related protein expression profile of the medicinal herb Macleaya cordata and anti-bacterial properties of recombinant proteins. PHYTOCHEMISTRY 2021; 184:112667. [PMID: 33548769 DOI: 10.1016/j.phytochem.2021.112667] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2020] [Revised: 01/07/2021] [Accepted: 01/09/2021] [Indexed: 06/12/2023]
Abstract
The plant pathogenesis-related (PR) proteins play a crucial role in the defense of plants against pathogens and orchestrate the innate immune system of plants. In this paper, a non-normalized cDNA library of the leaf was constructed to obtain a comprehensive view of PR proteins of Macleaya cordata. Specifically, 511 expressed sequence tags (ESTs) were generated using Sanger sequencing. All ESTs were assembled into 364 non-redundancy sequences, including 78 clusters and 286 singlets. The PR protein expression profile of the medicinal herb M. cordata has been investigated and is represented by defensin, lipid-transfer protein, (S)-norcoclaurine synthase, and major allergen protein, suggesting that the herb contains rich active proteins against pathogens. Furthermore, two defensins were selected for recombinant expression in yeast, and the antimicrobial activities were explored. Since they both present a broad antimicrobial spectrum, they are of particular importance for agricultural and medicinal applications. Our study describes defensins in Papaveraceae for the first time and provides novel insights into the effective components. In addition to the alkaloids, PR proteins (such as defensins, lipid transfer proteins, (S) - norcoclaurine synthase, major allergen protein, and Class IV chitinases) are involved in the antibacterial and anti-inflammatory activities of M. cordata.
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Affiliation(s)
- Jinjun Chen
- College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, Hunan, 410128, China.
| | - Zihao Liu
- College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, Hunan, 410128, China
| | - Yisong Liu
- Hunan Key Laboratory of Traditional Chinese Veterinary Medicine, Hunan Agricultural University, Changsha, 410128, China
| | - Xuewen Zhang
- College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, Hunan, 410128, China
| | - Jianguo Zeng
- Hunan Key Laboratory of Traditional Chinese Veterinary Medicine, Hunan Agricultural University, Changsha, 410128, China.
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Cheung LKY, Dupuis JH, Dee DR, Bryksa BC, Yada RY. Roles of Plant-Specific Inserts in Plant Defense. TRENDS IN PLANT SCIENCE 2020; 25:682-694. [PMID: 32526173 DOI: 10.1016/j.tplants.2020.02.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Revised: 02/10/2020] [Accepted: 02/14/2020] [Indexed: 06/11/2023]
Abstract
Ubiquitously expressed in plants, the plant-specific insert (PSI) of typical plant aspartic proteases (tpAPs) has been associated with plant development, stress response, and defense processes against invading pathogens. Despite sharing high sequence identity, structural studies revealed possible different mechanisms of action among species. The PSI induces signaling pathways of defense hormones in vivo and demonstrates broad-spectrum activity against phytopathogens in vitro. Recent characterization of the PSI-tpAP relationship uncovered novel, nonconventional intracellular protein transport pathways and improved tpAP production yields for industrial applications. In spite of research to date, relatively little is known about the structure-function relationships of PSIs. A comprehensive understanding of their biological roles may benefit plant protection strategies against virulent phytopathogens.
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Affiliation(s)
- Lennie K Y Cheung
- Faculty of Land and Food Systems, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - John H Dupuis
- Faculty of Land and Food Systems, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - Derek R Dee
- Faculty of Land and Food Systems, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - Brian C Bryksa
- Faculty of Land and Food Systems, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - Rickey Y Yada
- Faculty of Land and Food Systems, University of British Columbia, Vancouver, BC V6T 1Z4, Canada. @ubc.ca
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Soto N, Hernández Y, Delgado C, Rosabal Y, Ortiz R, Valencia L, Borrás-Hidalgo O, Pujol M, Enríquez GA. Field Resistance to Phakopsora pachyrhizi and Colletotrichum truncatum of Transgenic Soybean Expressing the NmDef02 Plant Defensin Gene. FRONTIERS IN PLANT SCIENCE 2020; 11:562. [PMID: 32528487 PMCID: PMC7264373 DOI: 10.3389/fpls.2020.00562] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Accepted: 04/15/2020] [Indexed: 05/20/2023]
Abstract
Fungal diseases lead to significant losses in soybean yields and a decline in seed quality; such is the case of the Asian soybean rust and anthracnose caused by Phakopsora pachyrhizi and Colletotrichum truncatum, respectively. Currently, the development of transgenic plants carrying antifungal defensins offers an alternative for plant protection against pathogens. This paper shows the production of transgenic soybean plants expressing the NmDef02 defensin gene using the biolistic delivery system, in an attempt to improve resistance against diseases and reduce the need for chemicals. Transgenic lines were assessed in field conditions under the natural infections of P. pachyrhizi and C. truncatum. The constitutive expression of the NmDef02 gene in transgenic soybean plants was shown to enhance resistance against these important plant pathogens. The quantification of the P. pachyrhizi biomass in infected soybean leaves revealed significant differences between transgenic lines and the non-transgenic control. In certain transgenic lines there was a strong reduction of fungal biomass, revealing a less severe disease. Integration and expression of the transgenes were confirmed by PCR, Southern blot, and qRT-PCR, where the Def1 line showed a higher relative expression of defensin. It was also found that the expression of the NmDef02 defensin gene in plants of the Def1 line did not have a negative effect on the nodulation induced by Bradyrhizobium japonicum. These results indicate that transgenic soybean plants expressing the NmDef02 defensin gene have a substantially enhanced resistance to economically important diseases, providing a sound environmental approach for decreasing yield losses and lowering the burden of chemicals in agriculture.
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Affiliation(s)
- Natacha Soto
- Soybean Biotechnology Laboratory, Plant Biotechnology Department, Center for Genetic Engineering and Biotechnology, Havana, Cuba
- *Correspondence: Natacha Soto,
| | - Yuniet Hernández
- Soybean Biotechnology Laboratory, Plant Biotechnology Department, Center for Genetic Engineering and Biotechnology, Havana, Cuba
| | - Celia Delgado
- Soybean Biotechnology Laboratory, Plant Biotechnology Department, Center for Genetic Engineering and Biotechnology, Havana, Cuba
| | - Yamilka Rosabal
- Soybean Biotechnology Laboratory, Plant Biotechnology Department, Center for Genetic Engineering and Biotechnology, Havana, Cuba
| | - Rodobaldo Ortiz
- National Institute of Agricultural Sciences, San José de las Lajas, Cuba
| | - Laura Valencia
- Soybean Biotechnology Laboratory, Plant Biotechnology Department, Center for Genetic Engineering and Biotechnology, Havana, Cuba
| | - Orlando Borrás-Hidalgo
- Soybean Biotechnology Laboratory, Plant Biotechnology Department, Center for Genetic Engineering and Biotechnology, Havana, Cuba
- Shandong Provincial Key Laboratory of Microbial Engineering, School of Biotechnology, Qilu University of Technology, Jinan, China
| | - Merardo Pujol
- Soybean Biotechnology Laboratory, Plant Biotechnology Department, Center for Genetic Engineering and Biotechnology, Havana, Cuba
| | - Gil A. Enríquez
- Soybean Biotechnology Laboratory, Plant Biotechnology Department, Center for Genetic Engineering and Biotechnology, Havana, Cuba
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Li H, Velivelli SLS, Shah DM. Antifungal Potency and Modes of Action of a Novel Olive Tree Defensin Against Closely Related Ascomycete Fungal Pathogens. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2019; 32:1649-1664. [PMID: 31425003 DOI: 10.1094/mpmi-08-19-0224-r] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Antimicrobial peptides play a pivotal role in the innate immunity of plants. Defensins are cysteine-rich antifungal peptides with multiple modes of action. A novel Oleaceae-specific defensin gene family has been discovered in the genome sequences of wild and cultivated species of a perennial olive tree, Olea europaea. OefDef1.1, a member of this defensin family, potently inhibits the in-vitro growth of ascomycete fungal pathogens Botrytis cinerea and three Fusarium spp. OefDef1.1 rapidly permeabilizes the plasma membrane of the conidial and germling cells of B. cinerea. Interestingly, it induces reactive oxygen species and translocates to the cytoplasm only in the germlings but not in the conidia. In medium containing a high concentration of Na1+, antifungal activity of OefDef1.1 is significantly reduced. Surprisingly, a chimeric OefDef1.1 peptide containing the γ-core motif of a Medicago truncatula defensin, MtDef4, displays Na1+-tolerant antifungal activity. In a phospholipid-protein overlay assay, the chimeric peptide exhibits stronger binding to its phosphoinositide partners than OefDef1.1 and is also more potent in inhibiting gray mold disease on the surface of Nicotiana benthamiana and lettuce leaves than OefDef1.1. Significant differences are observed among the four ascomycete pathogens in their responses to OefDef1.1 in growth medium with or without the elevated concentration of Na1+. The varied responses of closely related ascomycete pathogens to this defensin have implications for engineering disease resistance in plants.
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Affiliation(s)
- Hui Li
- Donald Danforth Plant Science Center, Saint Louis, MO 63132, U.S.A
| | | | - Dilip M Shah
- Donald Danforth Plant Science Center, Saint Louis, MO 63132, U.S.A
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10
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Wang C, Zhang Y, Zhang W, Yuan S, Ng T, Ye X. Purification of an Antifungal Peptide from Seeds of Brassica oleracea var. gongylodes and Investigation of Its Antifungal Activity and Mechanism of Action. Molecules 2019; 24:molecules24071337. [PMID: 30987412 PMCID: PMC6480268 DOI: 10.3390/molecules24071337] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2019] [Revised: 04/02/2019] [Accepted: 04/02/2019] [Indexed: 11/16/2022] Open
Abstract
In this study, a 8.5-kDa antifungal peptide designated as BGAP was purified from the crude extract of the seeds of Brassica oleracea var. gongylodes by employing a protocol that comprised cation exchange chromatography on SP-Sepharose, cation exchange chromatography on Mono S and gel filtration chromatography on Superdex peptide. BGAP showed the highest amino acid sequence similarity to defensin peptides by mass spectrometric analysis. BGAP showed a broad spectrum of antifungal activity with a half maximal inhibitory concentration at 17.33 μg/mL, 12.37 μg/mL, 16.81 μg/mL, and 5.60 μg/mL toward Colletotrichum higginsianum, Exserohilum turcicum, Magnaporthe oryzae and Mycosphaerella arachidicola, respectively. The antifungal activity of BGAP remained stable (i) after heat treatment at 40–100 °C for 15 min; (ii) after exposure to solutions of pH 1–3 and 11–13 for 15 min; (iii) after incubation with solutions containing K+, Ca2+, Mg2+, Mn2+ or Fe3+ ions at the concentrations of 20–150 mmol/L for 2 h; and (iv) following treatment with 10% methyl alcohol, 10% ethanol, 10% isopropanol or 10% chloroform for 2 h. Fluorescence staining experiments showed that BGAP brought about an increase in cell membrane permeability, a rise in reactive oxygen species production, a decrease in mitochondrial membrane potential, and an accumulation of chitin at the hyphal tips of Mycosphaerella arachidicola.
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Affiliation(s)
- Caicheng Wang
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
- Key Laboratory of Biopesticide and Chemical Biology, Ministry of Education, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
- Fujian Key Laboratory of Plant Virology, Institute of Plant Virology, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
| | - Yao Zhang
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
- Key Laboratory of Biopesticide and Chemical Biology, Ministry of Education, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
- Fujian Key Laboratory of Plant Virology, Institute of Plant Virology, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
| | - Weiwei Zhang
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
- Key Laboratory of Biopesticide and Chemical Biology, Ministry of Education, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
- Fujian Key Laboratory of Plant Virology, Institute of Plant Virology, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
| | - Susu Yuan
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
- Key Laboratory of Biopesticide and Chemical Biology, Ministry of Education, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
- Fujian Key Laboratory of Plant Virology, Institute of Plant Virology, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
| | - Tzibun Ng
- School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong 999077, China.
| | - Xiujuan Ye
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
- Key Laboratory of Biopesticide and Chemical Biology, Ministry of Education, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
- Fujian Key Laboratory of Plant Virology, Institute of Plant Virology, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
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11
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Badrhadad A, Nazarian-Firouzabadi F, Ismaili A. Fusion of a chitin-binding domain to an antibacterial peptide to enhance resistance to Fusarium solani in tobacco ( Nicotiana tabacum). 3 Biotech 2018; 8:391. [PMID: 30175028 DOI: 10.1007/s13205-018-1416-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Accepted: 08/23/2018] [Indexed: 12/16/2022] Open
Abstract
An antibacterial peptide-encoding gene from alfalfa seeds, alfAFP, was fused to the C-terminal part of chitin-binding domain (CBD) of the rice chitinase-encoding gene (CBD-alfAFP) and introduced to tobacco by Agrobacterium-mediated transformation. Polymerase chain reaction (PCR) technique was used to confirm the integration of the recombinant CBD-alfAFP encoding gene in transgenic tobacco plants. A number of transgenic lines and a non-transgenic control plant were selected for further molecular analyses. The result of analyzing the transgenic plants by semi-quantitative RT-PCR showed that the recombinant gene is expressed in transgenic plants and there is a difference between the transgenic plants in terms of the level of CBD-alfAFP expression. The total protein was extracted from a few selected transgenic plants and used to evaluate the antibacterial/antifungal of recombinant protein activity against some important plant and human pathogens. The results of this experiment showed that the total protein extract obtained from transgenic lines significantly (P < 0.05) inhibited the growth of various bacteria and fungi compared to the non-transgenic plants. Transgenic lines showed a significant (P < 0.01) difference considering their ability to inhibit bacterial and fungal pathogens growth. The recombinant CBD-alfAFP protein significantly (P < 0.01) increased the resistance of the transgenic plants against Fusarium solani. Transgenic lines showed no significant wilting symptoms and obvious wilting symptoms were not observed even 30 days post-inoculation (dpi) with Fusarium solani spores. These results suggest that transgenic tobacco plants are resistant to Fusarium solani wilt and fusion of CBD to the alfAFP antimicrobial peptide is an efficient approach to control fungal diseases.
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Affiliation(s)
- Azam Badrhadad
- Agronomy and Plant Breeding Department, Faculty of Agriculture, Lorestan University, Khorramabad, Iran
| | | | - Ahmad Ismaili
- Agronomy and Plant Breeding Department, Faculty of Agriculture, Lorestan University, Khorramabad, Iran
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12
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Čelakovská J, Bukač J, Ettler K, Vaneckova J, Ettlerova K, Krejsek J. Sensitisation to outdoor and indoor fungi in atopic dermatitis patients and the relation to the occurrence of food allergy to peanuts and walnuts. Mycoses 2018; 61:698-703. [PMID: 29772091 DOI: 10.1111/myc.12795] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 05/10/2018] [Accepted: 05/10/2018] [Indexed: 12/17/2022]
Abstract
The aim of this study is the evaluation of the relation between the sensitisation to outdoor and indoor fungi and allergy to peanuts and walnuts in atopic dermatitis patients aged 14 years and older. The complete dermatological and allergological examinations were performed in all included patients; the occurrence of food allergy to peanuts and walnuts was recorded (specific IgE, skin prick test, history of allergic reaction) and the sensitisation to mixture of outdoor fungi and indoor fungi was also examined (skin prick test, specific IgE). The statistical evaluation of the relation between the sensitisation to outdoor and indoor fungi and the occurrence of food allergy to peanuts and walnuts was performed; 329 patients were included in the study, 110 men and 219 women, the average age 26.8 years. The sensitisation to outdoor fungi was recorded in 91 patients (28%), the sensitisation to indoor fungi was recorded in 61 patients (18.5%), the occurrence of food allergy to peanuts was confirmed in 90 (27%) patients and to walnuts in 121 (36.7%) patients. We confirmed, that patients suffering from sensitisation to outdoor fungi suffer significantly more from food allergy to peanuts and walnuts. The significant relation between the sensitisation to indoor fungi and food allergy to peanuts and walnuts was not confirmed.
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Affiliation(s)
- Jarmila Čelakovská
- Department of Dermatology and Venereology, Faculty Hospital and Medical Faculty of Charles University, Hradec Králové, Czech Republic
| | - Josef Bukač
- Department of Medical Biophysics, Medical Faculty of Charles University, Hradec Králové, Czech Republic
| | - Karel Ettler
- Department of Dermatology and Venereology, Faculty Hospital and Medical Faculty of Charles University, Hradec Králové, Czech Republic
| | - Jaroslava Vaneckova
- Department of Dermatology and Venereology, Faculty Hospital and Medical Faculty of Charles University, Hradec Králové, Czech Republic
| | - Kvetuse Ettlerova
- Department of Allergy and Clinical Immunology, Outpatient Clinic, Hradec Králové, Czech Republic
| | - Jan Krejsek
- Department of Clinical Immunology and Allergy, Faculty Hospital and Medical Faculty of Charles University, Hradec Králové, Czech Republic
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Velivelli SLS, Islam KT, Hobson E, Shah DM. Modes of Action of a Bi-domain Plant Defensin MtDef5 Against a Bacterial Pathogen Xanthomonas campestris. Front Microbiol 2018; 9:934. [PMID: 29867843 PMCID: PMC5964164 DOI: 10.3389/fmicb.2018.00934] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Accepted: 04/23/2018] [Indexed: 11/24/2022] Open
Abstract
Defensins are small cysteine-rich endogenous host defense peptides expressed in all higher plants. They are thought to be important players in the defense arsenal of plants against fungal and oomycete pathogens. However, little is known regarding the antibacterial activity of these peptides. The genome of the model legume Medicago truncatula contains 63 genes each encoding a defensin with a tetradisulfide array. A unique bi-domain defensin, designated MtDef5, was recently characterized for its potent broad-spectrum antifungal activity. This 107-amino acid defensin contains two domains, 50 amino acids each, linked by a short peptide APKKVEP. Here, we characterize antibacterial activity of this defensin and its two domains, MtDef5A and MtDef5B, against two economically important plant bacterial pathogens, Gram-negative Xanthomonas campestris and Gram-positive Clavibacter michiganensis. MtDef5 inhibits the growth of X. campestris, but not C. michiganensis, at micromolar concentrations. MtDef5B, but not MtDef5A, exhibits more potent antibacterial activity than its parent MtDef5. MtDef5 and each of its two domains induce distinct morphological changes and cell death in X. campestris. They permeabilize the bacterial plasma membrane and translocate across membranes to the cytoplasm. They bind to negatively charged DNA indicating these peptides may kill bacterial cells by inhibiting DNA synthesis and/or transcription. The cationic amino acids present in the two γ-core motifs of MtDef5 that were previously shown to be important for its antifungal activity are also important for its antibacterial activity. MtDef5 and its more potent single domain MtDef5B have the potential to be deployed as antibacterial agents for control of a Xanthomonas wilt disease in transgenic crops.
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Affiliation(s)
| | - Kazi T Islam
- Donald Danforth Plant Science Center, St. Louis, MO, United States
| | - Eric Hobson
- Donald Danforth Plant Science Center, St. Louis, MO, United States.,Department of Biology, Jackson State University, Jackson, MS, United States
| | - Dilip M Shah
- Donald Danforth Plant Science Center, St. Louis, MO, United States
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Sharma KK, Pothana A, Prasad K, Shah D, Kaur J, Bhatnagar D, Chen Z, Raruang Y, Cary JW, Rajasekaran K, Sudini HK, Bhatnagar‐Mathur P. Peanuts that keep aflatoxin at bay: a threshold that matters. PLANT BIOTECHNOLOGY JOURNAL 2018; 16:1024-1033. [PMID: 28973784 PMCID: PMC5902767 DOI: 10.1111/pbi.12846] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Revised: 09/15/2017] [Accepted: 09/26/2017] [Indexed: 05/04/2023]
Abstract
Aflatoxin contamination in peanuts poses major challenges for vulnerable populations of sub-Saharan Africa and South Asia. Developing peanut varieties to combat preharvest Aspergillus flavus infection and resulting aflatoxin contamination has thus far remained a major challenge, confounded by highly complex peanut-Aspergilli pathosystem. Our study reports achieving a high level of resistance in peanut by overexpressing (OE) antifungal plant defensins MsDef1 and MtDef4.2, and through host-induced gene silencing (HIGS) of aflM and aflP genes from the aflatoxin biosynthetic pathway. While the former improves genetic resistance to A. flavus infection, the latter inhibits aflatoxin production in the event of infection providing durable resistance against different Aspergillus flavus morphotypes and negligible aflatoxin content in several peanut events/lines well. A strong positive correlation was observed between aflatoxin accumulation and decline in transcription of the aflatoxin biosynthetic pathway genes in both OE-Def and HIGS lines. Transcriptomic signatures in the resistant lines revealed key mechanisms such as regulation of aflatoxin synthesis, its packaging and export control, besides the role of reactive oxygen species-scavenging enzymes that render enhanced protection in the OE and HIGS lines. This is the first study to demonstrate highly effective biotechnological strategies for successfully generating peanuts that are near-immune to aflatoxin contamination, offering a panacea for serious food safety, health and trade issues in the semi-arid regions.
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Affiliation(s)
- Kiran K. Sharma
- International Crops Research Institute for the Semi‐Arid Tropics (ICRISAT)HyderabadTelanganaIndia
| | - Arunima Pothana
- International Crops Research Institute for the Semi‐Arid Tropics (ICRISAT)HyderabadTelanganaIndia
| | - Kalyani Prasad
- International Crops Research Institute for the Semi‐Arid Tropics (ICRISAT)HyderabadTelanganaIndia
| | - Dilip Shah
- Donald Danforth Plant Science CenterSt. LouisMOUSA
| | - Jagdeep Kaur
- Donald Danforth Plant Science CenterSt. LouisMOUSA
| | - Deepak Bhatnagar
- Southern Regional Research CenterAgricultural Research ServiceUnited States Department of Agriculture (USDA/ARS)New OrleansLAUSA
| | - Zhi‐Yuan Chen
- Department of Plant Pathology and Crop PhysiologyAgricultural centerLouisiana State UniversityBaton RougeLAUSA
| | - Yenjit Raruang
- Department of Plant Pathology and Crop PhysiologyAgricultural centerLouisiana State UniversityBaton RougeLAUSA
| | - Jeffrey W. Cary
- Southern Regional Research CenterAgricultural Research ServiceUnited States Department of Agriculture (USDA/ARS)New OrleansLAUSA
| | - Kanniah Rajasekaran
- Southern Regional Research CenterAgricultural Research ServiceUnited States Department of Agriculture (USDA/ARS)New OrleansLAUSA
| | - Hari Kishan Sudini
- International Crops Research Institute for the Semi‐Arid Tropics (ICRISAT)HyderabadTelanganaIndia
| | - Pooja Bhatnagar‐Mathur
- International Crops Research Institute for the Semi‐Arid Tropics (ICRISAT)HyderabadTelanganaIndia
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A novel bi-domain plant defensin MtDef5 with potent broad-spectrum antifungal activity binds to multiple phospholipids and forms oligomers. Sci Rep 2017; 7:16157. [PMID: 29170445 PMCID: PMC5700942 DOI: 10.1038/s41598-017-16508-w] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Accepted: 11/13/2017] [Indexed: 01/10/2023] Open
Abstract
Defensins are cysteine-rich cationic antimicrobial peptides contributing to the innate immunity in plants. A unique gene encoding a highly cationic bi-domain defensin MtDef5 has been identified in a model legume Medicago truncatula. MtDef5 consists of two defensin domains of 50 amino acids each linked by a 7-amino acid peptide. It exhibits broad-spectrum antifungal activity against filamentous fungi at submicromolar concentrations. It rapidly permeabilizes the plasma membrane of the ascomycete fungi Fusarium graminearum and Neurospora crassa and induces accumulation of reactive oxygen species. It is internalized by these fungi, but uses spatially distinct modes of entry into these fungi. It co-localizes with cellular membranes, travels to nucleus and becomes dispersed in other subcellular locations. It binds to several membrane-resident phospholipids with preference for phosphatidylinositol monophosphates and forms oligomers. Mutations of the cationic amino acids present in the two γ-core motifs of this defensin that eliminate oligomerization also knockout its ability to induce membrane permeabilization and fungal growth arrest. MtDef5 is the first bi-domain plant defensin that exhibits potent broad-spectrum antifungal activity, recruits multiple membrane phospholipids and forms oligomers in their presence. These findings raise the possibility that MtDef5 might be useful as a novel antifungal agent in transgenic crops.
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16
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Čelakovská J, Bukač J, Ettler K, Vaneckova J, Krcmova I, Ettlerova K. Sensitisation to fungi in atopic dermatitis patients over 14 years of age and the relation to the occurrence of food hypersensitivity reactions. Mycoses 2017; 61:88-95. [PMID: 28940850 DOI: 10.1111/myc.12707] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Accepted: 09/14/2017] [Indexed: 01/23/2023]
Abstract
The aim of this study was to evaluate if there is some relation between the sensitisation to fungi and the occurrence of food hypersensitivity reactions in atopic dermatitis patients aged 14 years and older. Complete dermatological and allergological examination was performed in all included patients; the occurrence of food hypersensitivity reactions was recorded and the sensitisation to mixture of fungi was examined (skin prick test, specific IgE). The statistical evaluation of the relation between the sensitisation to fungi and the occurrence of food hypersensitivity reactions was performed; 331 patients were included in the study, 110 men and 221 women, the average age was 26.8 years. The sensitisation to fungi was recorded in 100 patients (30%), the occurrence of food hypersensitivity reactions was recorded in 261 patients (79%). We confirmed that patients suffering from sensitisation to fungi suffer significantly more often from food hypersensitivity reactions to nuts (walnuts, peanuts) and sea fish; no significant relation was confirmed between the sensitisation to fungi and the occurrence of food hypersensitivity reactions to tomatoes, kiwi, apples, spices, oranges, capsicum, celery and carrot.
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Affiliation(s)
- J Čelakovská
- Department of Dermatology and Venereology, Faculty Hospital and Medical Faculty of Charles University, Hradec Králové, Czech Republic
| | - J Bukač
- Department of Medical Biophysics, Medical Faculty of Charles University, Hradec Králové, Czech Republic
| | - K Ettler
- Department of Dermatology and Venereology, Faculty Hospital and Medical Faculty of Charles University, Hradec Králové, Czech Republic
| | - J Vaneckova
- Department of Dermatology and Venereology, Faculty Hospital and Medical Faculty of Charles University, Hradec Králové, Czech Republic
| | - I Krcmova
- Department of Clinical Immunology and Allergy, Faculty Hospital and Medical Faculty of Charles University, Hradec Králové, Czech Republic
| | - K Ettlerova
- Department of Allergy and Clinical Immunology, Outpatient Clinic, Hradec Králové, Czech Republic
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17
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The Arabidopsis defensin gene, AtPDF1.1, mediates defence against Pectobacterium carotovorum subsp. carotovorum via an iron-withholding defence system. Sci Rep 2017; 7:9175. [PMID: 28835670 PMCID: PMC5569111 DOI: 10.1038/s41598-017-08497-7] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Accepted: 07/10/2017] [Indexed: 12/05/2022] Open
Abstract
Plant defensins (PDFs) are cysteine-rich peptides that have a range of biological functions, including defence against fungal pathogens. However, little is known about their role in defence against bacteria. In this study, we showed that the protein encoded by ARABIDOPSIS THALIANA PLANT DEFENSIN TYPE 1.1 (AtPDF1.1) is a secreted protein that can chelate apoplastic iron. Transcripts of AtPDF1.1 were induced in both systemic non-infected leaves of Arabidopsis thaliana plants and those infected with the necrotrophic bacterium Pectobacterium carotovorum subsp. carotovorum (Pcc). The expression levels of AtPDF1.1 with correct subcellular localization in transgenic A. thaliana plants were positively correlated with tolerance to Pcc, suggesting its involvement in the defence against this bacterium. Expression analysis of genes associated with iron homeostasis/deficiency and hormone signalling indicated that the increased sequestration of iron by apoplastic AtPDF1.1 overexpression perturbs iron homeostasis in leaves and consequently activates an iron-deficiency-mediated response in roots via the ethylene signalling pathway. This in turn triggers ethylene-mediated signalling in systemic leaves, which is involved in suppressing the infection of necrotrophic pathogens. These findings provide new insight into the key functions of plant defensins in limiting the infection by the necrotrophic bacterium Pcc via an iron-deficiency-mediated defence response.
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Eissa HF, Hassanien SE, Ramadan AM, El-Shamy MM, Saleh OM, Shokry AM, Abdelsattar M, Morsy YB, El-Maghraby MA, Alameldin HF, Hassan SM, Osman GH, Mahfouz HT, Gad El-Karim GA, Madkour MA, Bahieldin A. Developing transgenic wheat to encounter rusts and powdery mildew by overexpressing barley chi26 gene for fungal resistance. PLANT METHODS 2017; 13:41. [PMID: 28539970 PMCID: PMC5441082 DOI: 10.1186/s13007-017-0191-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2016] [Accepted: 05/15/2017] [Indexed: 05/02/2023]
Abstract
BACKGROUND The main aim of this study was to improve fungal resistance in bread wheat via transgenesis. Transgenic wheat plants harboring barley chitinase (chi26) gene, driven by maize ubi promoter, were obtained using biolistic bombardment, whereas the herbicide resistance gene, bar, driven by the CaMV 35S promoter was used as a selectable marker. RESULTS Molecular analysis confirmed the integration, copy number, and the level of expression of the chi26 gene in four independent transgenic events. Chitinase enzyme activity was detected using a standard enzymatic assay. The expression levels of chi26 gene in the different transgenic lines, compared to their respective controls, were determined using qRT-PCR. The transgene was silenced in some transgenic families across generations. Gene silencing in the present study seemed to be random and irreversible. The homozygous transgenic plants of T4, T5, T6, T8, and T9 generations were tested in the field for five growing seasons to evaluate their resistance against rusts and powdery mildew. The results indicated high chitinase activity at T0 and high transgene expression levels in few transgenic families. This resulted in high resistance against wheat rusts and powdery mildew under field conditions. It was indicated by proximate and chemical analyses that one of the transgenic families and the non-transgenic line were substantially equivalent. CONCLUSION Transgenic wheat with barley chi26 was found to be resistant even after five generations under artificial fungal infection conditions. One transgenic line was proved to be substantially equivalent as compared to the non-transgenic control.
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Affiliation(s)
- Hala F. Eissa
- Agricultural Genetic Engineering Research Institute (AGERI), Agriculture Research Center (ARC), Giza, 12619 Egypt
- Faculty of Biotechnology, Misr University for Science and Technology (MUST), Post Box 77, 6th October City, Egypt
| | - Sameh E. Hassanien
- Agricultural Genetic Engineering Research Institute (AGERI), Agriculture Research Center (ARC), Giza, 12619 Egypt
| | - Ahmed M. Ramadan
- Agricultural Genetic Engineering Research Institute (AGERI), Agriculture Research Center (ARC), Giza, 12619 Egypt
- Department of Biological Sciences, Faculty of Science, King Abdulaziz University, P.O. Box 80141, Jeddah, 21589 Saudi Arabia
| | - Moustafa M. El-Shamy
- Plant Pathology Research Institute (PPRI), Agriculture Research Center (ARC), Giza, 12619 Egypt
| | - Osama M. Saleh
- National Centre for Radiation Research and Technology (NCRRT), Cairo, 11781 Egypt
- Department of Biotechnology, Faculty of Applied Medical Science, Taif University, Turrabah, 21995 Saudi Arabia
| | - Ahmed M. Shokry
- Agricultural Genetic Engineering Research Institute (AGERI), Agriculture Research Center (ARC), Giza, 12619 Egypt
| | - Mohamed Abdelsattar
- Agricultural Genetic Engineering Research Institute (AGERI), Agriculture Research Center (ARC), Giza, 12619 Egypt
| | - Yasser B. Morsy
- Agricultural Genetic Engineering Research Institute (AGERI), Agriculture Research Center (ARC), Giza, 12619 Egypt
| | - Maher A. El-Maghraby
- Field Crops Research Institute, Agriculture Research Center (ARC), Giza, 12619 Egypt
| | - Hussien F. Alameldin
- Agricultural Genetic Engineering Research Institute (AGERI), Agriculture Research Center (ARC), Giza, 12619 Egypt
- Plant Soil and Microbial Sciences Department, Michigan State University, East Lansing, MI 48824 USA
| | - Sabah M. Hassan
- Department of Biological Sciences, Faculty of Science, King Abdulaziz University, P.O. Box 80141, Jeddah, 21589 Saudi Arabia
- Department of Genetics, Faculty of Agriculture, Ain Shams University, Cairo, 11566 Egypt
| | - Gamal H. Osman
- Agricultural Genetic Engineering Research Institute (AGERI), Agriculture Research Center (ARC), Giza, 12619 Egypt
- Department of Biology, Faculty of Applied Sciences, Umm Al-Qura University, Makkah, 21955 Saudi Arabia
| | - Hesham T. Mahfouz
- Department of Pomology, The Horticulture Research Institute (HRI), Agriculture Research Center (ARC), Giza, 12619 Egypt
| | - Gharib A. Gad El-Karim
- Agricultural Genetic Engineering Research Institute (AGERI), Agriculture Research Center (ARC), Giza, 12619 Egypt
| | - Magdy A. Madkour
- Arid Lands Agricultural Research Institute (ALARI), Faculty of Agriculture, Ain Shams University, P.O. Box 68, Hadayek Shoubra, Cairo, 11241 Egypt
| | - Ahmed Bahieldin
- Department of Biological Sciences, Faculty of Science, King Abdulaziz University, P.O. Box 80141, Jeddah, 21589 Saudi Arabia
- Department of Genetics, Faculty of Agriculture, Ain Shams University, Cairo, 11566 Egypt
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19
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Kaur J, Fellers J, Adholeya A, Velivelli SLS, El-Mounadi K, Nersesian N, Clemente T, Shah D. Expression of apoplast-targeted plant defensin MtDef4.2 confers resistance to leaf rust pathogen Puccinia triticina but does not affect mycorrhizal symbiosis in transgenic wheat. Transgenic Res 2017; 26:37-49. [PMID: 27582300 PMCID: PMC5243879 DOI: 10.1007/s11248-016-9978-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2016] [Accepted: 08/16/2016] [Indexed: 11/06/2022]
Abstract
Rust fungi of the order Pucciniales are destructive pathogens of wheat worldwide. Leaf rust caused by the obligate, biotrophic basidiomycete fungus Puccinia triticina (Pt) is an economically important disease capable of causing up to 50 % yield losses. Historically, resistant wheat cultivars have been used to control leaf rust, but genetic resistance is ephemeral and breaks down with the emergence of new virulent Pt races. There is a need to develop alternative measures for control of leaf rust in wheat. Development of transgenic wheat expressing an antifungal defensin offers a promising approach to complement the endogenous resistance genes within the wheat germplasm for durable resistance to Pt. To that end, two different wheat genotypes, Bobwhite and Xin Chun 9 were transformed with a chimeric gene encoding an apoplast-targeted antifungal plant defensin MtDEF4.2 from Medicago truncatula. Transgenic lines from four independent events were further characterized. Homozygous transgenic wheat lines expressing MtDEF4.2 displayed resistance to Pt race MCPSS relative to the non-transgenic controls in growth chamber bioassays. Histopathological analysis suggested the presence of both pre- and posthaustorial resistance to leaf rust in these transgenic lines. MtDEF4.2 did not, however, affect the root colonization of a beneficial arbuscular mycorrhizal fungus Rhizophagus irregularis. This study demonstrates that the expression of apoplast-targeted plant defensin MtDEF4.2 can provide substantial resistance to an economically important leaf rust disease in transgenic wheat without negatively impacting its symbiotic relationship with the beneficial mycorrhizal fungus.
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Affiliation(s)
- Jagdeep Kaur
- Donald Danforth Plant Science Center, St. Louis, MO, 63132, USA.
| | - John Fellers
- USDA-ARS-HWWGRU, Department of Plant Pathology, Kansas State University, Manhattan, KS, 66506, USA
| | - Alok Adholeya
- Mycorrhizal Applications, 1005 North Warson Road, BRDG Park, St. Louis, MO, 63132, USA
| | | | - Kaoutar El-Mounadi
- Donald Danforth Plant Science Center, St. Louis, MO, 63132, USA
- Department of Biology, Kutztown University of Pennsylvania, Kutztown, PA, 19530, USA
| | - Natalya Nersesian
- Center for Biotechnology, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA
| | - Thomas Clemente
- Department of Agronomy and Horticulture/Center for Plant Science Innovation, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA
| | - Dilip Shah
- Donald Danforth Plant Science Center, St. Louis, MO, 63132, USA
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20
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El-Mounadi K, Islam KT, Hernández-Ortiz P, Read ND, Shah DM. Antifungal mechanisms of a plant defensin MtDef4 are not conserved between the ascomycete fungi Neurospora crassa and Fusarium graminearum. Mol Microbiol 2016; 100:542-59. [PMID: 26801962 DOI: 10.1111/mmi.13333] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/20/2016] [Indexed: 12/14/2022]
Abstract
Defensins play an important role in plant defense against fungal pathogens. The plant defensin, MtDef4, inhibits growth of the ascomycete fungi, Neurospora crassa and Fusarium graminearum, at micromolar concentrations. We have reported that MtDef4 is transported into the cytoplasm of these fungi and exerts its antifungal activity on intracellular targets. Here, we have investigated whether the antifungal mechanisms of MtDef4 are conserved in these fungi. We show that N. crassa and F. graminearum respond differently to MtDef4 challenge. Membrane permeabilization is required for the antifungal activity of MtDef4 against F. graminearum but not against N. crassa. We find that MtDef4 is targeted to different subcellular compartments in each fungus. Internalization of MtDef4 in N. crassa is energy-dependent and involves endocytosis. By contrast, MtDef4 appears to translocate into F. graminearum autonomously using a partially energy-dependent pathway. MtDef4 has been shown to bind to the phospholipid phosphatidic acid (PA). We provide evidence that the plasma membrane localized phospholipase D, involved in the biosynthesis of PA, is needed for entry of this defensin in N. crassa, but not in F. graminearum. To our knowledge, this is the first example of a defensin which inhibits the growth of two ascomycete fungi via different mechanisms.
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Affiliation(s)
| | - Kazi T Islam
- Donald Danforth Plant Science Center, St Louis, MO, 63132, USA
| | - Patricia Hernández-Ortiz
- Manchester Fungal Infection Group, Institution of Inflammation and Repair, University of Manchester, Manchester, M13 9NT, UK
| | - Nick D Read
- Manchester Fungal Infection Group, Institution of Inflammation and Repair, University of Manchester, Manchester, M13 9NT, UK
| | - Dilip M Shah
- Donald Danforth Plant Science Center, St Louis, MO, 63132, USA
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21
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Anderson JA, Gipmans M, Hurst S, Layton R, Nehra N, Pickett J, Shah DM, Souza TLPO, Tripathi L. Emerging Agricultural Biotechnologies for Sustainable Agriculture and Food Security. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2016; 64:383-393. [PMID: 26785813 DOI: 10.1021/acs.jafc.5b04543] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
As global populations continue to increase, agricultural productivity will be challenged to keep pace without overtaxing important environmental resources. A dynamic and integrated approach will be required to solve global food insecurity and position agriculture on a trajectory toward sustainability. Genetically modified (GM) crops enhanced through modern biotechnology represent an important set of tools that can promote sustainable agriculture and improve food security. Several emerging biotechnology approaches were discussed in a recent symposium organized at the 13th IUPAC International Congress of Pesticide Chemistry meeting in San Francisco, CA, USA. This paper summarizes the innovative research and several of the new and emerging technologies within the field of agricultural biotechnology that were presented during the symposium. This discussion highlights how agricultural biotechnology fits within the context of sustainable agriculture and improved food security and can be used in support of further development and adoption of beneficial GM crops.
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Affiliation(s)
| | - Martijn Gipmans
- BASF Bioscience Research, c/o metanomics GmbH, Tegeler Weg 33, 10589 Berlin, Germany
| | - Susan Hurst
- Arcadia Biosciences, Seattle, Washington 98119, United States
| | | | - Narender Nehra
- Institute for International Crop Improvement, Donald Danforth Plant Science Center , St. Louis, Missouri 63132, United States
| | - John Pickett
- Rothamsted Research, Harpenden, Herts AL5 2JQ, United Kingdom
| | - Dilip M Shah
- Donald Danforth Plant Science Center , St. Louis, Missouri 63132, United States
| | - Thiago Lívio P O Souza
- Embrapa Arroz e Feijão, Rod. GO-462, km 12, Santo Antônio de Goiás, GO 75.375-000, Brazil
| | - Leena Tripathi
- International Institute of Tropical Agriculture (IITA), Nairobi, Kenya
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Muñoz A, Chu M, Marris PI, Sagaram US, Kaur J, Shah DM, Read ND. Specific domains of plant defensins differentially disrupt colony initiation, cell fusion and calcium homeostasis inNeurospora crassa. Mol Microbiol 2014; 92:1357-74. [DOI: 10.1111/mmi.12634] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/28/2014] [Indexed: 12/14/2022]
Affiliation(s)
- Alberto Muñoz
- Fungal Cell Biology Group; Institute of Cell Biology; University of Edinburgh; Edinburgh EH9 3JH UK
- Manchester Fungal Infection Group; Institute of Inflammation and Repair; CTF Building; University of Manchester; Manchester M13 9NT UK
| | - Meiling Chu
- Fungal Cell Biology Group; Institute of Cell Biology; University of Edinburgh; Edinburgh EH9 3JH UK
| | - Peter I. Marris
- Fungal Cell Biology Group; Institute of Cell Biology; University of Edinburgh; Edinburgh EH9 3JH UK
| | - Uma S. Sagaram
- Donald Danforth Plant Science Center; St Louis MO 63132 USA
| | - Jagdeep Kaur
- Donald Danforth Plant Science Center; St Louis MO 63132 USA
| | - Dilip M. Shah
- Donald Danforth Plant Science Center; St Louis MO 63132 USA
| | - Nick D. Read
- Fungal Cell Biology Group; Institute of Cell Biology; University of Edinburgh; Edinburgh EH9 3JH UK
- Manchester Fungal Infection Group; Institute of Inflammation and Repair; CTF Building; University of Manchester; Manchester M13 9NT UK
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Gaspar YM, McKenna JA, McGinness BS, Hinch J, Poon S, Connelly AA, Anderson MA, Heath RL. Field resistance to Fusarium oxysporum and Verticillium dahliae in transgenic cotton expressing the plant defensin NaD1. JOURNAL OF EXPERIMENTAL BOTANY 2014; 65:1541-50. [PMID: 24502957 PMCID: PMC3967090 DOI: 10.1093/jxb/eru021] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
The plant defensin NaD1, from Nicotiana alata, has potent antifungal activity against a range of filamentous fungi including the two important cotton pathogens, Fusarium oxysporum f. sp. vasinfectum (Fov) and Verticillium dahliae. Transgenic cotton plants expressing NaD1 were produced and plants from three events were selected for further characterization. Homozygous plants were assessed in greenhouse bioassays for resistance to Fov. One line (D1) was selected for field trial testing over three growing seasons in soils naturally infested with Fov and over two seasons in soils naturally infested with V. dahliae. In the field trials with Fov-infested soil, line D1 had 2-3-times the survival rate, a higher tolerance to Fov (higher disease rank), and a 2-4-fold increase in lint yield compared to the non-transgenic Coker control. When transgenic line D1 was planted in V. dahliae-infested soil, plants had a higher tolerance to Verticillium wilt and up to a 2-fold increase in lint yield compared to the non-transgenic Coker control. Line D1 did not exhibit any detrimental agronomic features compared to the parent Coker control when plants were grown in non-diseased soil. This study demonstrated that the expression of NaD1 in transgenic cotton plants can provide substantial resistance to two economically important fungal pathogens.
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Affiliation(s)
- Yolanda M. Gaspar
- Hexima Limited, School of Botany, The University of Melbourne, Melbourne, Victoria 3010, Australia
- Hexima Limited, La Trobe Institute for Molecular Science, La Trobe University, Bundoora, Victoria 3086, Australia
| | - James A. McKenna
- Hexima Limited, School of Botany, The University of Melbourne, Melbourne, Victoria 3010, Australia
- Hexima Limited, La Trobe Institute for Molecular Science, La Trobe University, Bundoora, Victoria 3086, Australia
| | - Bruce S. McGinness
- Hexima Limited, School of Botany, The University of Melbourne, Melbourne, Victoria 3010, Australia
| | - Jillian Hinch
- Hexima Limited, School of Botany, The University of Melbourne, Melbourne, Victoria 3010, Australia
| | - Simon Poon
- Hexima Limited, School of Botany, The University of Melbourne, Melbourne, Victoria 3010, Australia
- Hexima Limited, La Trobe Institute for Molecular Science, La Trobe University, Bundoora, Victoria 3086, Australia
| | - Angela A. Connelly
- Hexima Limited, School of Botany, The University of Melbourne, Melbourne, Victoria 3010, Australia
| | - Marilyn A. Anderson
- Hexima Limited, La Trobe Institute for Molecular Science, La Trobe University, Bundoora, Victoria 3086, Australia
| | - Robyn L. Heath
- Hexima Limited, School of Botany, The University of Melbourne, Melbourne, Victoria 3010, Australia
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Lay FT, Poon S, McKenna JA, Connelly AA, Barbeta BL, McGinness BS, Fox JL, Daly NL, Craik DJ, Heath RL, Anderson MA. The C-terminal propeptide of a plant defensin confers cytoprotective and subcellular targeting functions. BMC PLANT BIOLOGY 2014; 14:41. [PMID: 24495600 PMCID: PMC3922462 DOI: 10.1186/1471-2229-14-41] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Accepted: 01/28/2014] [Indexed: 05/07/2023]
Abstract
BACKGROUND Plant defensins are small (45-54 amino acids), basic, cysteine-rich proteins that have a major role in innate immunity in plants. Many defensins are potent antifungal molecules and are being evaluated for their potential to create crop plants with sustainable disease resistance. Defensins are produced as precursor molecules which are directed into the secretory pathway and are divided into two classes based on the absence (class I) or presence (class II) of an acidic C-terminal propeptide (CTPP) of about 33 amino acids. The function of this CTPP had not been defined. RESULTS By transgenically expressing the class II plant defensin NaD1 with and without its cognate CTPP we have demonstrated that NaD1 is phytotoxic to cotton plants when expressed without its CTPP. Transgenic cotton plants expressing constructs encoding the NaD1 precursor with the CTPP had the same morphology as non-transgenic plants but expression of NaD1 without the CTPP led to plants that were stunted, had crinkled leaves and were less viable. Immunofluorescence microscopy and transient expression of a green fluorescent protein (GFP)-CTPP chimera were used to confirm that the CTPP is sufficient for vacuolar targeting. Finally circular dichroism and NMR spectroscopy were used to show that the CTPP adopts a helical confirmation. CONCLUSIONS In this report we have described the role of the CTPP on NaD1, a class II defensin from Nicotiana alata flowers. The CTPP of NaD1 is sufficient for vacuolar targeting and plays an important role in detoxification of the defensin as it moves through the plant secretory pathway. This work may have important implications for the use of defensins for disease protection in transgenic crops.
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Affiliation(s)
- Fung T Lay
- La Trobe Institute for Molecular Science, La Trobe University, Melbourne VIC 3086, Australia
| | - Simon Poon
- La Trobe Institute for Molecular Science, La Trobe University, Melbourne VIC 3086, Australia
- School of Botany, University of Melbourne, Melbourne VIC 3010, Australia
| | - James A McKenna
- La Trobe Institute for Molecular Science, La Trobe University, Melbourne VIC 3086, Australia
- School of Botany, University of Melbourne, Melbourne VIC 3010, Australia
| | - Angela A Connelly
- School of Botany, University of Melbourne, Melbourne VIC 3010, Australia
| | - Barbara L Barbeta
- La Trobe Institute for Molecular Science, La Trobe University, Melbourne VIC 3086, Australia
| | - Bruce S McGinness
- School of Botany, University of Melbourne, Melbourne VIC 3010, Australia
| | - Jennifer L Fox
- La Trobe Institute for Molecular Science, La Trobe University, Melbourne VIC 3086, Australia
- School of Botany, University of Melbourne, Melbourne VIC 3010, Australia
| | - Norelle L Daly
- Institute for Molecular Bioscience, University of Queensland, Brisbane QLD 4072, Australia
| | - David J Craik
- Institute for Molecular Bioscience, University of Queensland, Brisbane QLD 4072, Australia
| | - Robyn L Heath
- School of Botany, University of Melbourne, Melbourne VIC 3010, Australia
| | - Marilyn A Anderson
- La Trobe Institute for Molecular Science, La Trobe University, Melbourne VIC 3086, Australia
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Structural and functional studies of a phosphatidic acid-binding antifungal plant defensin MtDef4: identification of an RGFRRR motif governing fungal cell entry. PLoS One 2013; 8:e82485. [PMID: 24324798 PMCID: PMC3853197 DOI: 10.1371/journal.pone.0082485] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2013] [Accepted: 10/25/2013] [Indexed: 01/27/2023] Open
Abstract
MtDef4 is a 47-amino acid cysteine-rich evolutionary conserved defensin from a model legume Medicago truncatula. It is an apoplast-localized plant defense protein that inhibits the growth of the ascomycetous fungal pathogen Fusarium graminearum in vitro at micromolar concentrations. Little is known about the mechanisms by which MtDef4 mediates its antifungal activity. In this study, we show that MtDef4 rapidly permeabilizes fungal plasma membrane and is internalized by the fungal cells where it accumulates in the cytoplasm. Furthermore, analysis of the structure of MtDef4 reveals the presence of a positively charged γ-core motif composed of β2 and β3 strands connected by a positively charged RGFRRR loop. Replacement of the RGFRRR sequence with AAAARR or RGFRAA abolishes the ability of MtDef4 to enter fungal cells, suggesting that the RGFRRR loop is a translocation signal required for the internalization of the protein. MtDef4 binds to phosphatidic acid (PA), a precursor for the biosynthesis of membrane phospholipids and a signaling lipid known to recruit cytosolic proteins to membranes. Amino acid substitutions in the RGFRRR sequence which abolish the ability of MtDef4 to enter fungal cells also impair its ability to bind PA. These findings suggest that MtDef4 is a novel antifungal plant defensin capable of entering into fungal cells and affecting intracellular targets and that these processes are mediated by the highly conserved cationic RGFRRR loop via its interaction with PA.
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van der Weerden NL, Bleackley MR, Anderson MA. Properties and mechanisms of action of naturally occurring antifungal peptides. Cell Mol Life Sci 2013; 70:3545-70. [PMID: 23381653 PMCID: PMC11114075 DOI: 10.1007/s00018-013-1260-1] [Citation(s) in RCA: 174] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2012] [Revised: 12/11/2012] [Accepted: 01/03/2013] [Indexed: 01/06/2023]
Abstract
Antimicrobial peptides are a vital component of the innate immune system of all eukaryotic organisms and many of these peptides have potent antifungal activity. They have potential application in the control of fungal pathogens that are a serious threat to both human health and food security. Development of antifungal peptides as therapeutics requires an understanding of their mechanism of action on fungal cells. To date, most research on antimicrobial peptides has focused on their activity against bacteria. Several antimicrobial peptides specifically target fungal cells and are not active against bacteria. Others with broader specificity often have different mechanisms of action against bacteria and fungi. This review focuses on the mechanism of action of naturally occurring antifungal peptides from a diverse range of sources including plants, mammals, amphibians, insects, crabs, spiders, and fungi. While antimicrobial peptides were originally proposed to act via membrane permeabilization, the mechanism of antifungal activity for these peptides is generally more complex and often involves entry of the peptide into the cell.
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De Coninck B, Cammue BP, Thevissen K. Modes of antifungal action and in planta functions of plant defensins and defensin-like peptides. FUNGAL BIOL REV 2013. [DOI: 10.1016/j.fbr.2012.10.002] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Kaur J, Thokala M, Robert-Seilaniantz A, Zhao P, Peyret H, Berg H, Pandey S, Jones J, Shah D. Subcellular targeting of an evolutionarily conserved plant defensin MtDef4.2 determines the outcome of plant-pathogen interaction in transgenic Arabidopsis. MOLECULAR PLANT PATHOLOGY 2012; 13:1032-46. [PMID: 22776629 PMCID: PMC6638660 DOI: 10.1111/j.1364-3703.2012.00813.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
The Medicago truncatula gene encoding an evolutionarily conserved antifungal defensin MtDef4.2 was cloned and characterized. In silico expression analysis indicated that MtDef4.2 is expressed in many tissues during the normal growth and development of M. truncatula. MtDef4.2 exhibits potent broad-spectrum antifungal activity against various Fusarium spp. Transgenic Arabidopsis thaliana lines in which MtDef4.2 was targeted to three different subcellular compartments were generated. These lines were tested for resistance to the obligate biotrophic oomycete Hyaloperonospora arabidopsidis Noco2 and the hemibiotrophic fungal pathogen Fusarium graminearum PH-1. MtDef4.2 directed to the extracellular space, but not to the vacuole or retained in the endoplasmic reticulum, conferred robust resistance to H. arabidopsidis. Siliques of transgenic Arabidopsis lines expressing either extracellularly or intracellularly targeted MtDef4.2 displayed low levels of resistance to F. graminearum, but accumulated substantially reduced levels of the mycotoxin deoxynivalenol. The data presented here suggest that extracellularly targeted MtDef4.2 is sufficient to provide strong resistance to the biotrophic oomycete, consistent with the extracellular lifestyle of this pathogen. However, the co-expression of extracellular and intracellular MtDef4.2 is probably required to achieve strong resistance to the hemibiotrophic pathogen F. graminearum which grows extracellularly and intracellularly.
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Affiliation(s)
- Jagdeep Kaur
- Donald Danforth Plant Science Center, St. Louis, MO 63132, USA
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Sagaram US, Kaur J, Shah D. Antifungal Plant Defensins: Structure-Activity Relationships, Modes of Action, and Biotech Applications. ACS SYMPOSIUM SERIES 2012. [DOI: 10.1021/bk-2012-1095.ch015] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
| | - Jagdeep Kaur
- Donald Danforth Plant Science Center, St. Louis, Missouri 63132, U.S.A
| | - Dilip Shah
- Donald Danforth Plant Science Center, St. Louis, Missouri 63132, U.S.A
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