1
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Gao J, Lin C, Zhang C, Zhang X, Wang Y, Xu H, Zhang T, Li H, Wang H, Wang X. Exploring the Function of (+)-Naltrexone Precursors: Their Activity as TLR4 Antagonists and Potential in Treating Morphine Addiction. J Med Chem 2024; 67:3127-3143. [PMID: 38306598 DOI: 10.1021/acs.jmedchem.3c02316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2024]
Abstract
Disruptions in the toll-like receptor 4 (TLR4) signaling pathway are linked to chronic inflammation, neuropathic pain, and drug addiction. (+)-Naltrexone, an opioid-derived TLR4 antagonist with a (+)-isomer configuration, does not interact with classical opioid receptors and has moderate blood-brain barrier permeability. Herein, we developed a concise 10-step synthesis for (+)-naltrexone and explored its precursors, (+)-14-hydroxycodeinone (1) and (+)-14-hydroxymorphinone (3). These precursors exhibited TLR4 antagonistic activities 100 times stronger than (+)-naltrexone, particularly inhibiting the TLR4-TRIF pathway. In vivo studies showed that these precursors effectively reduced behavioral effects of morphine, like sensitization and conditioned place preference by suppressing microglial activation and TNF-α expression in the medial prefrontal cortex and ventral tegmental area. Additionally, 3 displayed a longer half-life and higher oral bioavailability than 1. Overall, this research optimized (+)-naltrexone synthesis and identified its precursors as potent TLR4 antagonists, offering potential treatments for morphine addiction.
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Affiliation(s)
- Jingwei Gao
- Laboratory of Chemical Biology, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China
- School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Cong Lin
- Laboratory of Chemical Biology, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China
| | - Cong Zhang
- Laboratory of Chemical Biology, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China
- School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Xiaozheng Zhang
- Department of Biochemistry and Molecular Biology, Shanxi Key Laboratory of Birth Defect and Cell Regeneration, Shanxi Medical University, Taiyuan, Shanxi 030001, China
| | - Yibo Wang
- Laboratory of Chemical Biology, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China
| | - Hangyu Xu
- Laboratory of Chemical Biology, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China
| | - Tianshu Zhang
- Laboratory of Chemical Biology, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China
- School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Haohong Li
- Liangzhu Laboratory, MOE Frontier Science Center for Brain Science and Brain-Machine Integration, State Key Laboratory of Brain-Machine Intelligence, Zhejiang University, Hangzhou, Zhejiang 311121, China
| | - Hongshuang Wang
- Laboratory of Chemical Biology, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China
| | - Xiaohui Wang
- Laboratory of Chemical Biology, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China
- School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China
- Beijing National Laboratory for Molecular Sciences, Beijing 100190, China
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2
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Bhatt S, Faridi N, Raj SMP, Agarwal A, Punetha M. Recent advances in immuno-based methods for the detection of Ralstonia solanacearum. J Microbiol Methods 2024; 217-218:106889. [PMID: 38211840 DOI: 10.1016/j.mimet.2024.106889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 01/08/2024] [Accepted: 01/08/2024] [Indexed: 01/13/2024]
Abstract
Ralstonia solanacearum (RS) is a widely recognized phytopathogenic bacterium which is responsible for causing devastating losses in a wide range of economically significant crops. Timely and accurate detection of this pathogen is pivotal to implementing effective disease management strategies and preventing crop losses. This review provides a comprehensive overview of recent advances in immuno-based detection methods for RS. The review begins by introducing RS, highlighting its destructive potential and the need for point-of-care detection techniques. Subsequently, it explores traditional detection methods and their limitations, emphasizing the need for innovative approaches. The main focus of this review is on immuno-based detection methods and it discusses recent advancements in serological detection techniques. Furthermore, the review sheds light on the challenges and prospects of immuno-based detection of RS. It emphasizes the importance of developing rapid, field-deployable assays that can be used by farmers and researchers alike. In conclusion, this review provides valuable insights into the recent advances in immuno-based detection methods for RS.
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Affiliation(s)
- Shalini Bhatt
- P P Savani University, Surat 394125, Gujarat, India; Defence Institute of Bio-Energy Research (DIBER), DRDO, Nainital, Haldwani 263139, Uttarakhand, India.
| | - Neha Faridi
- Defence Institute of Bio-Energy Research (DIBER), DRDO, Nainital, Haldwani 263139, Uttarakhand, India
| | - S Merwyn P Raj
- Defence Institute of Bio-Energy Research (DIBER), DRDO, Nainital, Haldwani 263139, Uttarakhand, India
| | - Ankur Agarwal
- Defence Institute of Bio-Energy Research (DIBER), DRDO, Nainital, Haldwani 263139, Uttarakhand, India
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3
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Ramamoorthy S, Pena M, Ghosh P, Liao YY, Paret M, Jones JB, Potnis N. Transcriptome profiling of type VI secretion system core gene tssM mutant of Xanthomonas perforans highlights regulators controlling diverse functions ranging from virulence to metabolism. Microbiol Spectr 2024; 12:e0285223. [PMID: 38018859 PMCID: PMC10782981 DOI: 10.1128/spectrum.02852-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Accepted: 10/20/2023] [Indexed: 11/30/2023] Open
Abstract
IMPORTANCE T6SS has received attention due to its significance in mediating interorganismal competition through contact-dependent release of effector molecules into prokaryotic and eukaryotic cells. Reverse-genetic studies have indicated the role of T6SS in virulence in a variety of plant pathogenic bacteria, including the one studied here, Xanthomonas. However, it is not clear whether such effect on virulence is merely due to a shift in the microbiome-mediated protection or if T6SS is involved in a complex virulence regulatory network. In this study, we conducted in vitro transcriptome profiling in minimal medium to decipher the signaling pathways regulated by tssM-i3* in X. perforans AL65. We show that TssM-i3* regulates the expression of a suite of genes associated with virulence and metabolism either directly or indirectly by altering the transcription of several regulators. These findings further expand our knowledge on the intricate molecular circuits regulated by T6SS in phytopathogenic bacteria.
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Affiliation(s)
- Sivakumar Ramamoorthy
- Department of Entomology and Plant Pathology, Auburn University, Auburn, Alabama, USA
| | - Michelle Pena
- Department of Entomology and Plant Pathology, Auburn University, Auburn, Alabama, USA
| | - Palash Ghosh
- Department of Entomology and Plant Pathology, Auburn University, Auburn, Alabama, USA
| | - Ying-Yu Liao
- Department of Plant Pathology, University of Florida, Gainesville, Florida, USA
| | - Mathews Paret
- Department of Plant Pathology, University of Florida, Gainesville, Florida, USA
| | - Jeffrey B. Jones
- Department of Plant Pathology, University of Florida, Gainesville, Florida, USA
| | - Neha Potnis
- Department of Entomology and Plant Pathology, Auburn University, Auburn, Alabama, USA
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4
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Hu X, Lee S, Manohar M, Chen J. Efficacy of Ascaroside #18 Treatments in Control of Salmonella enterica on Alfalfa and Fenugreek Seeds and Sprouts. J Food Prot 2023; 86:100064. [PMID: 36916549 PMCID: PMC10807822 DOI: 10.1016/j.jfp.2023.100064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 02/02/2023] [Accepted: 02/06/2023] [Indexed: 02/12/2023]
Abstract
A novel, natural, and effective antimicrobial intervention is in demand for improving the microbial safety of vegetable seeds/sprouts. This study assessed the efficacy of ascaroside treatment in the control of Salmonella enterica on alfalfa and fenugreek sprouts. Sanitized commercial seeds were treated with 1 mM or 1 µM ascaroside (ascr)#18, a plant immunity modulator (PIM) and dried for an hour before being inoculated with lyophilized S. Cubana or S. Stanley cells in sandy soil (104 CFU/g). Treated and untreated seeds were spouted on 1% water agar at 25°C in the dark. Seed or sprout samples were collected on days 0, 1, 3, 5, and 7, and the population of Salmonella was determined. Data were fit into the general linear arrangement, and means were separated using Fisher's least significant difference test. Seed type, strain type, treatment type, and sprouting time were significant factors (P ≤ 0.05) influencing Salmonella growth on sprouts. The populations of Salmonella were significantly higher on fenugreek than on alfalfa sprouts. S. Stanley had a significantly higher population than S. Cubana. The population of Salmonella increased from day 0 to day 3 and reached the peak population on Day 5. Treatments with both concentrations of ascaroside significantly decreased the populations of Salmonella compared to the controls. The mean Salmonella population reduction was ca. 4 or 1 log CFU/g by treatment with 1 mM and 1 µM of the PIM, respectively. Treatment with the PIM could be potentially used to improve the microbial safety of vegetable seeds and sprouts.
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Affiliation(s)
- Xueyan Hu
- Department of Food Science and Technology, The University of Georgia, Griffin, GA 30223-1797, USA
| | - Seulgi Lee
- Department of Food Science and Technology, The University of Georgia, Griffin, GA 30223-1797, USA
| | | | - Jinru Chen
- Department of Food Science and Technology, The University of Georgia, Griffin, GA 30223-1797, USA.
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Tian Z, Khan AI, Rehman AU, Deng T, Ma C, Wang L. Virulence factors and mechanisms of paediatric pneumonia caused by Enterococcus faecalis. Gut Pathog 2023; 15:2. [PMID: 36624474 PMCID: PMC9830894 DOI: 10.1186/s13099-022-00522-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Accepted: 12/09/2022] [Indexed: 01/11/2023] Open
Abstract
Paediatric pneumonia is a respiratory infection that affects infants and young children under the age of 3. This disease is the leading cause of infant and child mortality in developing countries because of the weak immune system of young children. The difficulty and length of time required to identify the pathogen and causative agent are the main reasons for this high mortality rate. In addition, the identification of certain causative agents is particularly important for the treatment of paediatric pneumonia. In this study, we explored the possible mechanisms by which pathogenic Enterococcus faecalis induced pneumonia in vivo. The potential virulence factors of bacteria isolated from the intestines of paediatric pneumonia patients were determined. Taken together, the results suggested that lysophosphatidic acid (LTA) from pathogenic E. faecalis decreases the expression of platelet-activating factor receptor (PAFR), which in turn disrupts the function of intestinal tight junctions (Occ and Ccldn1), leading to the entry of LE-LTA into the bloodstream because of the disruption of the intestinal barrier. Although LTA can enter circulation, it cannot directly infiltrate the lungs, which indicates that lung inflammation in mice is not caused by the direct entry of LE-LTA into the lungs. We further found that LTA activates immune cells, such as CD8 + T cells and type 2 innate lymphocytes, in vivo. Interleukin-6 and interleukin-17 can produce large amounts of inflammatory factors and thus promote the development of pneumonia. In conclusion, our findings demonstrate that the LTA of pathogenic E. faecalis in the intestine is a virulence factor that can cause paediatric pneumonia. This study found that intestinal bacterial virulence factors can induce immune responses in the lungs and blood. These findings could provide further insight into the mechanism of infectious diseases in the lung that are caused by bacteria in the intestine.
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Affiliation(s)
- Zhiying Tian
- grid.411971.b0000 0000 9558 1426Laboratory of Biochemistry and Molecular Biology, Department of Biotechnology, College of Basic Medicine, Dalian Medical University, Dalian, China
| | - Asif Iqbal Khan
- grid.411971.b0000 0000 9558 1426Laboratory of Biochemistry and Molecular Biology, Department of Biotechnology, College of Basic Medicine, Dalian Medical University, Dalian, China
| | - Ata Ur Rehman
- grid.411971.b0000 0000 9558 1426Laboratory of Biochemistry and Molecular Biology, Department of Biotechnology, College of Basic Medicine, Dalian Medical University, Dalian, China
| | - Ting Deng
- grid.411971.b0000 0000 9558 1426Laboratory of Biochemistry and Molecular Biology, Department of Biotechnology, College of Basic Medicine, Dalian Medical University, Dalian, China
| | - Chao Ma
- grid.411971.b0000 0000 9558 1426Laboratory of Biochemistry and Molecular Biology, Department of Biotechnology, College of Basic Medicine, Dalian Medical University, Dalian, China
| | - Liang Wang
- grid.452435.10000 0004 1798 9070National Joint Engineering Laboratory, Regenerative Medicine Centre, Stem Cell Clinical Research Centre, The First Affiliated Hospital of Dalian Medical University, Dalian, China
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6
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Yuan Z, Zhao Y, Mo Z, Liu H. A Bacillus licheniformis Glycoside Hydrolase 43 Protein Is Recognized as a MAMP. Int J Mol Sci 2022; 23:ijms232214435. [PMID: 36430908 PMCID: PMC9697650 DOI: 10.3390/ijms232214435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 11/07/2022] [Accepted: 11/12/2022] [Indexed: 11/22/2022] Open
Abstract
Glycoside hydrolases from pathogens have often been reported as inducers of immune responses. However, the roles of glycoside hydrolase from plant-growth-promoting rhizobacteria (PGPR) in the resistance of plants against pathogens is not well studied. In this study, we identified a glycoside hydrolase 43 protein, H1AD43, produced by Bacillus licheniformis BL06 that can trigger defense responses, including cell death. Ion-exchange and size-exclusion chromatography were used for separation, and the amino acid sequence was identified by mass spectrometry. The recombinant protein generated by prokaryotic expression was able to elicit a hypersensitive response (HR) in Nicotiana benthamiana and trigger early defense responses, including reactive oxygen species (ROS) burst, callose accumulation, and the induction of defense genes. In addition, the protein could induce resistance in N. benthamiana, in which it inhibited infection by Phytophthora capsici Leonian and tobacco mosaic virus-green fluorescent protein (TMV-GFP) expression. H1AD43 thus represents a microbe-associated molecular pattern (MAMP) of PGPR that induces plant disease resistance and may provide a new method for the biological control of plant disease.
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Affiliation(s)
- Zhixiang Yuan
- College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing Agricultural University, Nanjing 210095, China
| | - Ying Zhao
- College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing Agricultural University, Nanjing 210095, China
| | - Zhitong Mo
- College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing Agricultural University, Nanjing 210095, China
| | - Hongxia Liu
- College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing Agricultural University, Nanjing 210095, China
- Correspondence: ; Tel.: +86-025-8439-5240
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7
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Bai Y, Lyu M, Fukunaga M, Watanabe S, Iwatani S, Miyanaga K, Yamamoto N. Lactobacillus johnsonii enhances the gut barrier integrity via the interaction between GAPDH and the mouse tight junction protein JAM-2. Food Funct 2022; 13:11021-11033. [PMID: 36069670 DOI: 10.1039/d2fo00886f] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Commensal intestinal microbiota interacts with gut epithelial cells in the host by binding to specific host receptors. Several pattern recognition receptors on the gut that sense conserved microbial-associated molecular patterns have been reported; however, many of the gut receptor molecules involved in bacterial binding have not yet been identified. In this study, commensal intestinal bacteria interacting with mouse gut surface proteins were screened from fecal bacterial samples, to identify novel receptors on the epithelial cells in the mouse gut. Among the screened intestinal lactic acid bacteria, the frequently isolated Lactobacillus johnsonii MG was used for the purification of gut receptor proteins. An approximately 30 kDa protein was purified using affinity resin coupled surface layer proteins isolated from L. johnsonii MG. The purified gut protein was identified as a member of the tight junction protein family, junctional adhesion molecule-2 (JAM-2). As expected, the tight junctions of Caco-2 cells damaged by H2O2 were repaired by incubation with L. johnsonii MG. RNA sequence analysis showed significant upregulation of the expression of genes for tight junctions, anti-inflammatory effects, transcriptional regulation, and apoptosis in Caco-2 cells, following L. johnsonii MG treatment. In L. johnsonii MG, the surface layer 40 kDa protein was purified with gut protein-coupled affinity resin and identified as the moonlighting protein glyceraldehyde-3-phosphate dehydrogenase (GAPDH). These results suggest that L. johnsonii MG promotes the barrier function integrity in Caco-2 cells via GAPDH-JAM-2 binding. Here, we propose a promising approach to identify novel gut receptor molecules based on commensal bacterial interactions and understand host-bacterial communication in a mouse model.
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Affiliation(s)
- Yuying Bai
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8501, Japan
| | - Mengying Lyu
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8501, Japan
| | - Moe Fukunaga
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8501, Japan
| | - Shin Watanabe
- Department of Emergency and Disaster Medicine Juntendo University, 2-1-1 Hongo, Bunkyo-ku, Tokyo, 113-8421, Japan
| | - Shun Iwatani
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8501, Japan.,Tsukuba Biotechnology Research Center, 5-2-3, Tokodai, Tsukuba-shi, Ibaraki 300-2698, Japan
| | - Kazuhiko Miyanaga
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8501, Japan.,Department of Infection and Immunity, School of Medicine, Jichi Medical University, 3311-1, Yakushiji, Shimotsuke-Shi, Tochigi, 329-0498, Japan
| | - Naoyuki Yamamoto
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8501, Japan
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8
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Hayashi S, Iwamoto Y, Hirakawa Y, Mori K, Yamada N, Maki T, Yamamoto S, Miyasaka H. Plant-Growth-Promoting Effect by Cell Components of Purple Non-Sulfur Photosynthetic Bacteria. Microorganisms 2022; 10:microorganisms10040771. [PMID: 35456821 PMCID: PMC9031236 DOI: 10.3390/microorganisms10040771] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2022] [Revised: 03/20/2022] [Accepted: 03/21/2022] [Indexed: 11/25/2022] Open
Abstract
Rhodobacter sphaeroides, a purple non-sulfur photosynthetic bacterium (PNSB), was disrupted by sonication and fractionated by centrifugation into the supernatant and pellet. The effects of the supernatant and pellet on plant growth were examined using Brassica rapa var. perviridis (komatsuna) in the pot experiments. Both fractions showed growth-promoting effects: the supernatant at high concentrations (1 × 107 to 4 × 107 cfu-equivalent mL−1) and the pellet at a low concentration of 2 × 103 cfu-equivalent mL−1). We expected lipopolysaccharide (LPS) to be the active principle of the pellet fraction and examined the effects of LPS on the growth of B. rapa var. perviridis. The growth of the plants was significantly enhanced by the foliar feeding of R. sphaeroides LPS at concentrations ranging from 10 to 100 pg mL−1. The present study is the first report indicating that LPS acts as one of the active principles of the plant-growth-promoting effect of PNSB.
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Affiliation(s)
- Shuhei Hayashi
- Department of Applied Life Science, Sojo University, 4-22-1 Ikeda, Nishiku, Kumamoto 860-0082, Japan; (Y.I.); (Y.H.); (K.M.); (S.Y.); (H.M.)
- Correspondence:
| | - Yasunari Iwamoto
- Department of Applied Life Science, Sojo University, 4-22-1 Ikeda, Nishiku, Kumamoto 860-0082, Japan; (Y.I.); (Y.H.); (K.M.); (S.Y.); (H.M.)
| | - Yuki Hirakawa
- Department of Applied Life Science, Sojo University, 4-22-1 Ikeda, Nishiku, Kumamoto 860-0082, Japan; (Y.I.); (Y.H.); (K.M.); (S.Y.); (H.M.)
| | - Koichi Mori
- Department of Applied Life Science, Sojo University, 4-22-1 Ikeda, Nishiku, Kumamoto 860-0082, Japan; (Y.I.); (Y.H.); (K.M.); (S.Y.); (H.M.)
| | - Naoki Yamada
- Matsumoto Institute of Microorganisms Co., Ltd., 2904 Niimura, Matsumoto, Nagano 390-1241, Japan; (N.Y.); (T.M.)
| | - Takaaki Maki
- Matsumoto Institute of Microorganisms Co., Ltd., 2904 Niimura, Matsumoto, Nagano 390-1241, Japan; (N.Y.); (T.M.)
| | - Shinjiro Yamamoto
- Department of Applied Life Science, Sojo University, 4-22-1 Ikeda, Nishiku, Kumamoto 860-0082, Japan; (Y.I.); (Y.H.); (K.M.); (S.Y.); (H.M.)
| | - Hitoshi Miyasaka
- Department of Applied Life Science, Sojo University, 4-22-1 Ikeda, Nishiku, Kumamoto 860-0082, Japan; (Y.I.); (Y.H.); (K.M.); (S.Y.); (H.M.)
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9
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Krasova YV, Tkachenko OV, Sigida EN, Lobachev YV, Burygin GL. Lipopolysaccharide and flagellin of Azospirillum brasilense Sp7 influence callus morphogenesis and plant regeneration in wheat. World J Microbiol Biotechnol 2022; 38:62. [PMID: 35199239 DOI: 10.1007/s11274-022-03247-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2021] [Accepted: 02/11/2022] [Indexed: 11/25/2022]
Abstract
In vitro somatic callus culturing is used widely in plant biotechnology, but its effectiveness depends largely on the donor plant genotype. Bacteria or components of their cells are rarely used to activate morphogenesis. In this work, inoculation of explants from immature wheat (Triticum aestivum L.) embryos with a suspension of living cells of the bacterium Azospirillum brasilense Sp7 resulted in callus death after 7 days of growth, in contrast to explant treatment with a suspension of heat-killed whole cells of Sp7. The experiments used two wheat lines, LRht-B1a and LRht-B1c, which differ in morphogenic activity. Growing calluses with the lipopolysaccharide of A. brasilense Sp7 increased the yield of regenerated plants 2- to 3.5-fold in both lines. This increase was through the activation of regenerant formation from morphogenic calluses. We have demonstrated for the first time the effects of bacterial flagellin on plant tissue culture. The polar-flagellum flagellin of A. brasilense Sp7 leveled the genotypic differences in the morphogenic ability of callus tissue. Specifically, it increased the yield of morphogenic calluses in the weakly morphogenic line LRht-B1a to the yield value in the highly morphogenic line LRht-B1c but lowered the yield of regenerants in the highly morphogenic line LRht-B1c to the yield value in the weakly morphogenic line LRht-B1a. Thus, bacterial lipopolysaccharides and flagellins can be used to regulate the formation of morphogenic calluses and regenerants in plant tissue culturing in vitro.
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Affiliation(s)
- Yuliya V Krasova
- Institute of Biochemistry and Physiology of Plants and Microorganisms, Saratov Scientific Centre of the Russian Academy of Sciences (IBPPM RAS), 13 Prospekt Entuziastov, 410049, Saratov, Russia
| | - Oksana V Tkachenko
- Vavilov Saratov State Agrarian University, 1 Teatralnaya Ploshchad, 410012, Saratov, Russia
| | - Elena N Sigida
- Institute of Biochemistry and Physiology of Plants and Microorganisms, Saratov Scientific Centre of the Russian Academy of Sciences (IBPPM RAS), 13 Prospekt Entuziastov, 410049, Saratov, Russia
| | - Yuriy V Lobachev
- Vavilov Saratov State Agrarian University, 1 Teatralnaya Ploshchad, 410012, Saratov, Russia
| | - Gennady L Burygin
- Institute of Biochemistry and Physiology of Plants and Microorganisms, Saratov Scientific Centre of the Russian Academy of Sciences (IBPPM RAS), 13 Prospekt Entuziastov, 410049, Saratov, Russia.
- Vavilov Saratov State Agrarian University, 1 Teatralnaya Ploshchad, 410012, Saratov, Russia.
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10
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Meena M, Yadav G, Sonigra P, Nagda A, Mehta T, Zehra A, Swapnil P. Role of Microbial Bioagents as Elicitors in Plant Defense Regulation. TRANSCRIPTION FACTORS FOR BIOTIC STRESS TOLERANCE IN PLANTS 2022:103-128. [DOI: 10.1007/978-3-031-12990-2_6] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
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11
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Di Lorenzo F, Duda KA, Lanzetta R, Silipo A, De Castro C, Molinaro A. A Journey from Structure to Function of Bacterial Lipopolysaccharides. Chem Rev 2021; 122:15767-15821. [PMID: 34286971 DOI: 10.1021/acs.chemrev.0c01321] [Citation(s) in RCA: 72] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Lipopolysaccharide (LPS) is a crucial constituent of the outer membrane of most Gram-negative bacteria, playing a fundamental role in the protection of bacteria from environmental stress factors, in drug resistance, in pathogenesis, and in symbiosis. During the last decades, LPS has been thoroughly dissected, and massive information on this fascinating biomolecule is now available. In this Review, we will give the reader a third millennium update of the current knowledge of LPS with key information on the inherent peculiar carbohydrate chemistry due to often puzzling sugar residues that are uniquely found on it. Then, we will drive the reader through the complex and multifarious immunological outcomes that any given LPS can raise, which is strictly dependent on its chemical structure. Further, we will argue about issues that still remain unresolved and that would represent the immediate future of LPS research. It is critical to address these points to complete our notions on LPS chemistry, functions, and roles, in turn leading to innovative ways to manipulate the processes involving such a still controversial and intriguing biomolecule.
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Affiliation(s)
- Flaviana Di Lorenzo
- Department of Chemical Sciences, University of Naples Federico II, Via Cinthia 4, 80126 Naples, Italy.,Task Force on Microbiome Studies, University of Naples Federico II, Via Cinthia 4, 80126 Naples, Italy
| | - Katarzyna A Duda
- Research Center Borstel Leibniz Lung Center, Parkallee 4a, 23845 Borstel, Germany
| | - Rosa Lanzetta
- Department of Chemical Sciences, University of Naples Federico II, Via Cinthia 4, 80126 Naples, Italy
| | - Alba Silipo
- Department of Chemical Sciences, University of Naples Federico II, Via Cinthia 4, 80126 Naples, Italy.,Task Force on Microbiome Studies, University of Naples Federico II, Via Cinthia 4, 80126 Naples, Italy
| | - Cristina De Castro
- Task Force on Microbiome Studies, University of Naples Federico II, Via Cinthia 4, 80126 Naples, Italy.,Department of Agricultural Sciences, University of Naples Federico II, Via Università 96, 80055 Portici, Naples, Italy
| | - Antonio Molinaro
- Department of Chemical Sciences, University of Naples Federico II, Via Cinthia 4, 80126 Naples, Italy.,Task Force on Microbiome Studies, University of Naples Federico II, Via Cinthia 4, 80126 Naples, Italy.,Department of Chemistry, School of Science, Osaka University, 1-1 Osaka University Machikaneyama, Toyonaka, Osaka 560-0043, Japan
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12
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Wanke A, Malisic M, Wawra S, Zuccaro A. Unraveling the sugar code: the role of microbial extracellular glycans in plant-microbe interactions. JOURNAL OF EXPERIMENTAL BOTANY 2021; 72:15-35. [PMID: 32929496 PMCID: PMC7816849 DOI: 10.1093/jxb/eraa414] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Accepted: 09/14/2020] [Indexed: 05/14/2023]
Abstract
To defend against microbial invaders but also to establish symbiotic programs, plants need to detect the presence of microbes through the perception of molecular signatures characteristic of a whole class of microbes. Among these molecular signatures, extracellular glycans represent a structurally complex and diverse group of biomolecules that has a pivotal role in the molecular dialog between plants and microbes. Secreted glycans and glycoconjugates such as symbiotic lipochitooligosaccharides or immunosuppressive cyclic β-glucans act as microbial messengers that prepare the ground for host colonization. On the other hand, microbial cell surface glycans are important indicators of microbial presence. They are conserved structures normally exposed and thus accessible for plant hydrolytic enzymes and cell surface receptor proteins. While the immunogenic potential of bacterial cell surface glycoconjugates such as lipopolysaccharides and peptidoglycan has been intensively studied in the past years, perception of cell surface glycans from filamentous microbes such as fungi or oomycetes is still largely unexplored. To date, only few studies have focused on the role of fungal-derived cell surface glycans other than chitin, highlighting a knowledge gap that needs to be addressed. The objective of this review is to give an overview on the biological functions and perception of microbial extracellular glycans, primarily focusing on their recognition and their contribution to plant-microbe interactions.
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Affiliation(s)
- Alan Wanke
- University of Cologne, Cluster of Excellence on Plant Sciences (CEPLAS), Institute for Plant Sciences, Cologne, Germany
- Max Planck Institute for Plant Breeding Research, Cologne, Germany
| | - Milena Malisic
- University of Cologne, Cluster of Excellence on Plant Sciences (CEPLAS), Institute for Plant Sciences, Cologne, Germany
| | - Stephan Wawra
- University of Cologne, Cluster of Excellence on Plant Sciences (CEPLAS), Institute for Plant Sciences, Cologne, Germany
| | - Alga Zuccaro
- University of Cologne, Cluster of Excellence on Plant Sciences (CEPLAS), Institute for Plant Sciences, Cologne, Germany
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13
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McMillan HM, Zebell SG, Ristaino JB, Dong X, Kuehn MJ. Protective plant immune responses are elicited by bacterial outer membrane vesicles. Cell Rep 2021; 34:108645. [PMID: 33472073 PMCID: PMC8158063 DOI: 10.1016/j.celrep.2020.108645] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 10/26/2020] [Accepted: 12/21/2020] [Indexed: 12/22/2022] Open
Abstract
Bacterial outer membrane vesicles (OMVs) perform a variety of functions in bacterial survival and virulence. In mammalian systems, OMVs activate immune responses and are exploited as vaccines. However, little work has focused on the interactions of OMVs with plant hosts. Here, we report that OMVs from Pseudomonas syringae and P. fluorescens activate plant immune responses that protect against bacterial and oomycete pathogens. OMV-mediated immunomodulatory activity from these species displayed different sensitivity to biochemical stressors, reflecting differences in OMV content. Importantly, OMV-mediated plant responses are distinct from those triggered by conserved bacterial epitopes or effector molecules alone. Our study shows that OMV-induced protective immune responses are independent of the T3SS and protein, but that OMV-mediated seedling growth inhibition largely depends on proteinaceous components. OMVs provide a unique opportunity to understand the interplay between virulence and host response strategies and add a new dimension to consider in host-microbe interactions. The role that bacterial outer membrane vesicles (OMVs) play in plant-microbe interactions is poorly characterized. McMillan et al. show that OMVs elicit plant immune responses that protect against pathogens. This study also reveals a use for OMVs as tools to probe the plant immune system.
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Affiliation(s)
- Hannah M McMillan
- Department of Molecular Genetics and Microbiology, Duke University, Durham, NC 27710, USA
| | - Sophia G Zebell
- Howard Hughes Medical Institute, Department of Biology, Duke University, Durham, NC 27708, USA
| | - Jean B Ristaino
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC 27695, USA
| | - Xinnian Dong
- Howard Hughes Medical Institute, Department of Biology, Duke University, Durham, NC 27708, USA
| | - Meta J Kuehn
- Department of Molecular Genetics and Microbiology, Duke University, Durham, NC 27710, USA; Department of Biochemistry, Duke University, Durham, NC 27710, USA.
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14
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Nikoloudakis N, Pappi P, Markakis EA, Charova SN, Fanourakis D, Paschalidis K, Delis C, Tzortzakakis EA, Tsaniklidis G. Structural Diversity and Highly Specific Host-Pathogen Transcriptional Regulation of Defensin Genes Is Revealed in Tomato. Int J Mol Sci 2020; 21:ijms21249380. [PMID: 33317090 PMCID: PMC7764197 DOI: 10.3390/ijms21249380] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 12/01/2020] [Accepted: 12/02/2020] [Indexed: 01/17/2023] Open
Abstract
Defensins are small and rather ubiquitous cysteine-rich anti-microbial peptides. These proteins may act against pathogenic microorganisms either directly (by binding and disrupting membranes) or indirectly (as signaling molecules that participate in the organization of the cellular defense). Even though defensins are widespread across eukaryotes, still, extensive nucleotide and amino acid dissimilarities hamper the elucidation of their response to stimuli and mode of function. In the current study, we screened the Solanum lycopersicum genome for the identification of defensin genes, predicted the relating protein structures, and further studied their transcriptional responses to biotic (Verticillium dahliae, Meloidogyne javanica, Cucumber Mosaic Virus, and Potato Virus Y infections) and abiotic (cold stress) stimuli. Tomato defensin sequences were classified into two groups (C8 and C12). Our data indicate that the transcription of defensin coding genes primarily depends on the specific pathogen recognition patterns of V. dahliae and M. javanica. The immunodetection of plant defensin 1 protein was achieved only in the roots of plants inoculated with V. dahliae. In contrast, the almost null effects of viral infections and cold stress, and the failure to substantially induce the gene transcription suggest that these factors are probably not primarily targeted by the tomato defensin network.
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Affiliation(s)
- Nikolaos Nikoloudakis
- Department of Agricultural Science, Biotechnology and Food Science, Cyprus University of Technology, Limassol 3036, Cyprus
- Correspondence: (N.N.); (G.T.)
| | - Polyxeni Pappi
- Department of Viticulture, Vegetable Crops, Floriculture and Plant Protection, Institute of Olive Tree, Subtropical Crops and Viticulture, Hellenic Agricultural Organization ELGO-DIMITRA, Mesa Katsabas, 71307 Heraklion, Crete, Greece; (P.P.); (E.A.M.); (E.A.T.)
| | - Emmanouil A. Markakis
- Department of Viticulture, Vegetable Crops, Floriculture and Plant Protection, Institute of Olive Tree, Subtropical Crops and Viticulture, Hellenic Agricultural Organization ELGO-DIMITRA, Mesa Katsabas, 71307 Heraklion, Crete, Greece; (P.P.); (E.A.M.); (E.A.T.)
| | - Spyridoula N. Charova
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas (IMBB-FORTH), 70013 Heraklion, Crete, Greece;
- Department of Biology, University of Crete, 70013 Heraklion, Crete, Greece
| | - Dimitrios Fanourakis
- Giannakakis SA, Export Fruits and Vegetables, 70200 Tympaki, Crete, Greece;
- School of Agricultural Sciences, Hellenic Mediterranean University, Estavromenos, 71004 Heraklion, Crete, Greece;
| | - Konstantinos Paschalidis
- School of Agricultural Sciences, Hellenic Mediterranean University, Estavromenos, 71004 Heraklion, Crete, Greece;
| | - Costas Delis
- Department of Agricultural Technology, School of Agricultural Technology and Food Technology and Nutrition, University of Peloponnese, 24100 Antikalamos, Kalamata, Greece;
| | - Emmanuel A. Tzortzakakis
- Department of Viticulture, Vegetable Crops, Floriculture and Plant Protection, Institute of Olive Tree, Subtropical Crops and Viticulture, Hellenic Agricultural Organization ELGO-DIMITRA, Mesa Katsabas, 71307 Heraklion, Crete, Greece; (P.P.); (E.A.M.); (E.A.T.)
| | - Georgios Tsaniklidis
- Department of Viticulture, Vegetable Crops, Floriculture and Plant Protection, Institute of Olive Tree, Subtropical Crops and Viticulture, Hellenic Agricultural Organization ELGO-DIMITRA, Mesa Katsabas, 71307 Heraklion, Crete, Greece; (P.P.); (E.A.M.); (E.A.T.)
- Correspondence: (N.N.); (G.T.)
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15
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Identification of MAMP-Responsive Plasma Membrane-Associated Proteins in Arabidopsis thaliana Following Challenge with Different LPS Chemotypes from Xanthomonas campestris. Pathogens 2020; 9:pathogens9100787. [PMID: 32992883 PMCID: PMC7650673 DOI: 10.3390/pathogens9100787] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Revised: 09/22/2020] [Accepted: 09/22/2020] [Indexed: 12/02/2022] Open
Abstract
Lipopolysaccharides (LPS) are recognized as microbe-associated molecular patterns (MAMPs) responsible for eliciting defense-related responses and while the effects have been well-documented in mammals, there is a lack of knowledge regarding the mechanism of perception in plant systems and recognized structural moieties within the macromolecular lipoglycan structure. Thus, identification of the LPS plasma membrane (PM) receptor(s)/receptor complex in Arabidopsis thaliana through proteomics will contribute to a deeper understanding of induced defense responses. As such, structurally characterized LPS chemotypes from Xanthomonas campestris pv. campestris (Xcc) wild-type 8004 (prototypical smooth-type LPS) and mutant 8530 (truncated core with no O–chain) strains were utilized to pre-treat A. thaliana plants. The associated proteomic response/changes within the PM were compared over a 24 h period using mass spectrometry-based methodologies following three variants of LPS-immobilized affinity chromatography. This resulted in the identification of proteins from several functional categories, but importantly, those involved in perception and defense. The distinct structural features between wild-type and mutant LPS are likely responsible for the differential changes to the proteome profiles, and many of the significant proteins were identified in response to the wild-type Xcc LPS where it is suggested that the core oligosaccharide and O-chain participate in recognition by receptor-like kinases (RLKs) in a multiprotein complex and, notably, varied from that of the mutant chemotype.
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16
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Hernaández-Esquivel AA, Castro-Mercado E, Valencia-Cantero E, Alexandre G, García-Pineda E. Application of Azospirillum brasilense Lipopolysaccharides to Promote Early Wheat Plant Growth and Analysis of Related Biochemical Responses. FRONTIERS IN SUSTAINABLE FOOD SYSTEMS 2020. [DOI: 10.3389/fsufs.2020.579976] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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17
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Martin RL, Le Boulch P, Clin P, Schwarzenberg A, Yvin JC, Andrivon D, Nguema-Ona E, Val F. A comparison of PTI defense profiles induced in Solanum tuberosum by PAMP and non-PAMP elicitors shows distinct, elicitor-specific responses. PLoS One 2020; 15:e0236633. [PMID: 32785249 PMCID: PMC7423108 DOI: 10.1371/journal.pone.0236633] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Accepted: 07/10/2020] [Indexed: 01/01/2023] Open
Abstract
The induction of general plant defense responses following the perception of external elicitors is now regarded as the first level of the plant immune response. Depending on the involvement or not of these molecules in pathogenicity, this induction of defense is called either Pathogen-Associated Molecular Pattern (PAMP) Triggered Immunity or Pattern Triggered Immunity-both abbreviated to PTI. Because PTI is assumed to be a widespread and stable form of resistance to infection, understanding the mechanisms driving it becomes a major goal for the sustainable management of plant-pathogen interactions. However, the induction of PTI is complex. Our hypotheses are that (i) the recognition by the plant of PAMPs vs non-PAMP elicitors leads to specific defense profiles and (ii) the responses specifically induced by PAMPs target critical life history traits of the pathogen that produced them. We thus analyzed, using a metabolomic approach coupled with transcriptomic and hormonal analyses, the defense profiles induced in potato foliage treated with either a Concentrated Culture Filtrate (CCF) from Phytophthora infestans or two non-PAMP preparations, β-aminobutyric acid (BABA) and an Ulva spp. Extract, used separately. Each elicitor induced specific defense profiles. CCF up-regulated sesquiterpenes but down-regulated sterols and phenols, notably α-chaconine, caffeoyl quinic acid and rutin, which decreased spore production of P. infestans in vitro. CCF thus induces both defense and counter-defense responses. By contrast, the Ulva extract triggered the synthesis of a large-spectrum of antimicrobial compounds through the phenylpropanoid/flavonoid pathways, while BABA targeted the primary metabolism. Hence, PTI can be regarded as a heterogeneous set of general and pathogen-specific responses triggered by the molecular signatures of each elicitor, rather than as a uniform, non-specific and broad-spectrum set of general defense reactions.
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Affiliation(s)
- Rafaela Lopes Martin
- AGROCAMPUS-OUEST, UMR IGEPP 1349-Institut de Génétique, Environnement et Protection des Plantes, Rennes, France
- Centre Mondial de l’Innovation Roullier, Laboratoire de Nutrition Végétale, Pôle Stress Biotiques, Saint Malo, France
| | - Pauline Le Boulch
- AGROCAMPUS-OUEST, UMR IGEPP 1349-Institut de Génétique, Environnement et Protection des Plantes, Rennes, France
| | - Pauline Clin
- AGROCAMPUS-OUEST, UMR IGEPP 1349-Institut de Génétique, Environnement et Protection des Plantes, Rennes, France
| | - Adrián Schwarzenberg
- Centre Mondial de l’Innovation Roullier, Laboratoire de Nutrition Végétale, Pôle Stress Biotiques, Saint Malo, France
| | - Jean-Claude Yvin
- Centre Mondial de l’Innovation Roullier, Laboratoire de Nutrition Végétale, Pôle Stress Biotiques, Saint Malo, France
| | - Didier Andrivon
- INRAE, UMR IGEPP 1349-Institut de Génétique, Environnement et Protection des Plantes, Le Rheu, France
| | - Eric Nguema-Ona
- Centre Mondial de l’Innovation Roullier, Laboratoire de Nutrition Végétale, Pôle Stress Biotiques, Saint Malo, France
| | - Florence Val
- AGROCAMPUS-OUEST, UMR IGEPP 1349-Institut de Génétique, Environnement et Protection des Plantes, Rennes, France
- Centre Mondial de l’Innovation Roullier, Laboratoire de Nutrition Végétale, Pôle Stress Biotiques, Saint Malo, France
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18
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Estelle D, Laurence L, Marc O, Caroline DC, Magali D, Marie-Laure F. Linolenic fatty acid hydroperoxide acts as biocide on plant pathogenic bacteria: Biophysical investigation of the mode of action. Bioorg Chem 2020; 100:103877. [DOI: 10.1016/j.bioorg.2020.103877] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 03/27/2020] [Accepted: 04/21/2020] [Indexed: 10/24/2022]
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19
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Heo J, Cho K, Kim U, Cho DH, Ko S, Tran QG, Lee YJ, Ryu CM, Kim HS. Genome-wide high-throughput screening of interactive bacterial metabolite in the algal population using Escherichia coli K-12 Keio collection. Sci Rep 2020; 10:10647. [PMID: 32606320 PMCID: PMC7327039 DOI: 10.1038/s41598-020-67322-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Accepted: 06/05/2020] [Indexed: 11/09/2022] Open
Abstract
Algae-bacteria interaction is one of the main factors underlying the formation of harmful algal blooms (HABs). The aim of this study was to develop a genome-wide high-throughput screening method to identify HAB-influenced specific interactive bacterial metabolites using a comprehensive collection of gene-disrupted E. coli K-12 mutants (Keio collection). The screening revealed that a total of 80 gene knockout mutants in E. coli K-12 resulted in an approximately 1.5-fold increase in algal growth relative to that in wild-type E. coli. Five bacterial genes (lpxL, lpxM, kdsC, kdsD, gmhB) involved in the lipopolysaccharide (LPS) (or lipooligosaccharide, LOS) biosynthesis were identified from the screen. Relatively lower levels of LPS were detected in these bacteria compared to that in the wild-type. Moreover, the concentration-dependent decrease in microalgal growth after synthetic LPS supplementation indicated that LPS inhibits algal growth. LPS supplementation increased the 2,7-dichlorodihydrofluorescein diacetate fluorescence, as well as the levels of lipid peroxidation-mediated malondialdehyde formation, in a concentration-dependent manner, indicating that oxidative stress can result from LPS supplementation. Furthermore, supplementation with LPS also remarkably reduced the growth of diverse bloom-forming dinoflagellates and green algae. Our findings indicate that the Keio collection-based high-throughput in vitro screening is an effective approach for the identification of interactive bacterial metabolites and related genes.
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Affiliation(s)
- Jina Heo
- Cell Factory Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, 34141, Republic of Korea.,Department of Environmental Biotechnology, KRIBB School of Biotechnology, Korea University of Science and Technology (UST), Daejeon, 34113, Republic of Korea
| | - Kichul Cho
- Department of Applied Marine Bioresource Science, National Marine Biodiversity Institute of Korea (MABIK), Seocheon-gun, 33662, Republic of Korea
| | - Urim Kim
- Cell Factory Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, 34141, Republic of Korea.,Department of Environmental Biotechnology, KRIBB School of Biotechnology, Korea University of Science and Technology (UST), Daejeon, 34113, Republic of Korea
| | - Dae-Hyun Cho
- Cell Factory Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, 34141, Republic of Korea
| | - Sora Ko
- Cell Factory Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, 34141, Republic of Korea
| | - Quynh-Giao Tran
- Cell Factory Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, 34141, Republic of Korea.,Department of Environmental Biotechnology, KRIBB School of Biotechnology, Korea University of Science and Technology (UST), Daejeon, 34113, Republic of Korea
| | - Yong Jae Lee
- Cell Factory Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, 34141, Republic of Korea
| | - Choong-Min Ryu
- Molecular Phytobacteriology Laboratory, Infectious Disease Research Center, KRIBB, Daejeon, 34141, Republic of Korea.,Department of Biosystems and Bioengineering, KRIBB School of Biotechnology, Korea University of Science and Technology (UST), Daejeon, 34113, Republic of Korea
| | - Hee-Sik Kim
- Cell Factory Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, 34141, Republic of Korea. .,Department of Environmental Biotechnology, KRIBB School of Biotechnology, Korea University of Science and Technology (UST), Daejeon, 34113, Republic of Korea.
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20
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Luo X, Wu W, Liang Y, Xu N, Wang Z, Zou H, Liu J. Tyrosine phosphorylation of the lectin receptor-like kinase LORE regulates plant immunity. EMBO J 2020; 39:e102856. [PMID: 31922267 DOI: 10.15252/embj.2019102856] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 12/07/2019] [Accepted: 12/16/2019] [Indexed: 12/13/2022] Open
Abstract
Plant pattern recognition receptors (PRRs) perceive pathogen-associated molecular patterns (PAMPs) to activate immune responses. Medium-chain 3-hydroxy fatty acids (mc-3-OH-FAs), which are widely present in Gram-negative bacteria, were recently shown to be novel PAMPs in Arabidopsis thaliana. The Arabidopsis PRR LIPOOLIGOSACCHARIDE-SPECIFIC REDUCED ELICITATION (LORE) is a G-type lectin receptor-like kinase that recognizes mc-3-OH-FAs and subsequently mounts an immune response; however, the mechanisms underlying LORE activation and downstream signaling are unexplored. Here, we report that one of the mc-3-OH-FAs, 3-OH-C10:0, induces phosphorylation of LORE at tyrosine residue 600 (Y600). Phosphorylated LORE subsequently trans-phosphorylates the receptor-like cytoplasmic kinase PBL34 and its close paralogs, PBL35 and PBL36, and therefore activates plant immunity. Phosphorylation of LORE Y600 is required for downstream phosphorylation of PBL34, PBL35, and PBL36. However, the Pseudomonas syringae effector HopAO1 targets LORE, dephosphorylating the tyrosine-phosphorylated Y600 and therefore suppressing the immune response. These observations uncover the mechanism by which LORE mediates signaling in response to 3-OH-C10:0 in Arabidopsis.
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Affiliation(s)
- Xuming Luo
- State Key Laboratory of Plant Genomics, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China.,CAS Center for Excellence in Biotic Interactions, University of Chinese Academy of Sciences, Beijing, China
| | - Wei Wu
- State Key Laboratory of Plant Genomics, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China.,College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Yingbo Liang
- State Key Laboratory of Plant Genomics, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China.,CAS Center for Excellence in Biotic Interactions, University of Chinese Academy of Sciences, Beijing, China
| | - Ning Xu
- State Key Laboratory of Plant Genomics, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Zongyi Wang
- Beijing Key Laboratory of Agricultural Product Detection and Control for Spoilage Organisms and Pesticides, Beijing University of Agriculture, Beijing, China
| | - Huasong Zou
- College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Jun Liu
- State Key Laboratory of Plant Genomics, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China.,CAS Center for Excellence in Biotic Interactions, University of Chinese Academy of Sciences, Beijing, China
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21
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Rocha-Ramírez LM, Hernández-Ochoa B, Gómez-Manzo S, Marcial-Quino J, Cárdenas-Rodríguez N, Centeno-Leija S, García-Garibay M. Evaluation of Immunomodulatory Activities of the Heat-Killed Probiotic Strain Lactobacillus casei IMAU60214 on Macrophages In Vitro. Microorganisms 2020; 8:microorganisms8010079. [PMID: 31936101 PMCID: PMC7022880 DOI: 10.3390/microorganisms8010079] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2019] [Revised: 01/02/2020] [Accepted: 01/05/2020] [Indexed: 12/16/2022] Open
Abstract
Most Lactobacillus species have beneficial immunological (“immunoprobiotic”) effects in the host. However, it is unclear how probiotic bacteria regulate immune responses. The present study investigated the effects of heat-killed Lactobacillus casei IMAU60214 on the activity of human monocyte-derived macrophages (MDMs). Human MDMs were treated with heat-killed L. casei at a ratio (bacteria/MDM) of 50:1, 100:1, 250:1, and 500:1, and then evaluated for the following: NO production, by Griess reaction; phagocytosis of FITC-labeled Staphylococcus aureus particles; cytokine secretion profile (tumor necrosis factor (TNF)-α, interleukin (IL)-1β, IL-6, IL-12p70, IL-10, and transforming growth factor (TGF)-β) by ELISA; and costimulatory molecule (CD80 and CD86) surface expression, by flow cytometry. Heat-killed L. casei IMAU60214 enhanced phagocytosis, NO production, cytokine release, and surface expression of CD80 and CD86 in a dose-dependent manner. All products were previously suppressed by pretreatment with a Toll-like receptor 2 (TLR2)-neutralizing antibody. Overall, our findings suggest that this probiotic strain promotes an M1-like pro-inflammatory phenotype through the TLR2 signaling pathway. These effects on macrophage phenotype help explain the probiotic efficacy of Lactobacillus and provide important information for the selection of therapeutic targets and treatments compatible with the immunological characteristics of this probiotic strain.
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Affiliation(s)
- Luz María Rocha-Ramírez
- Unidad de Investigación en Enfermedades Infecciosas, Hospital Infantil de México Federico Gómez, Secretaría de Salud Dr. Márquez No. 162, Col Doctores, Delegación Cuauhtémoc, Ciudad de México 06720, Mexico
- Correspondence: ; Tel.: +52-55-5228-9917 (ext. 2084)
| | - Beatriz Hernández-Ochoa
- Laboratorio de Inmunoquímica y Biología Celular, Hospital Infantil de México Federico Gómez, Secretaría de Salud. Dr. Márquez No. 162, Col Doctores, Delegación Cuauhtémoc, Ciudad de México 06720, Mexico;
| | - Saúl Gómez-Manzo
- Laboratorio de Bioquímica Genética, Instituto Nacional de Pediatría, Secretaria de Salud, Ciudad de México 04530, Mexico;
| | - Jaime Marcial-Quino
- Consejo Nacional de Ciencia y Tecnología (CONACYT), Instituto Nacional de Pediatría, Secretaría de Salud, Ciudad de México 04530, Mexico;
| | - Noemí Cárdenas-Rodríguez
- Laboratorio de Neurociencias, Instituto Nacional de Pediatría, Secretaría de Salud, Ciudad de México 04530, Mexico;
| | - Sara Centeno-Leija
- Consejo Nacional Ciencia y Tecnologia (CONACYT) Laboratorio de Agrobiotecnología, Tecnoparque CLQ, Universidad de Colima, Carretera Los Limones-Loma de Juárez, Colima 28629, Mexico;
| | - Mariano García-Garibay
- Departamento de Ciencias de la Alimentación, Unidad Lerma, Universidad Autónoma Metropolitana, Av. San Rafael Atlixco No. 186. Col Vicentina, Ciudad de México 09340, Mexico;
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22
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Schellenberger R, Touchard M, Clément C, Baillieul F, Cordelier S, Crouzet J, Dorey S. Apoplastic invasion patterns triggering plant immunity: plasma membrane sensing at the frontline. MOLECULAR PLANT PATHOLOGY 2019; 20:1602-1616. [PMID: 31353775 PMCID: PMC6804340 DOI: 10.1111/mpp.12857] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Plants are able to effectively cope with invading pathogens by activating an immune response based on the detection of invasion patterns (IPs) originating from the pathogen or released by the plant after infection. At a first level, this perception takes place at the plasma membrane through cell surface immune receptors and although the involvement of proteinaceous pattern recognition receptors (PRRs) is well established, increasing data are also pointing out the role of membrane lipids in the sensing of IPs. In this review, we discuss the evolution of various conceptual models describing plant immunity and present an overview of well-characterized IPs from different natures and origins. We summarize the current knowledge on how they are perceived by plants at the plasma membrane, highlighting the increasingly apparent diversity of sentinel-related systems in plants.
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Affiliation(s)
- Romain Schellenberger
- University of Reims Champagne‐ArdenneRIBP EA 4707, SFR Condorcet FR CNRS 3417Reims51100France
| | - Matthieu Touchard
- University of Reims Champagne‐ArdenneRIBP EA 4707, SFR Condorcet FR CNRS 3417Reims51100France
| | - Christophe Clément
- University of Reims Champagne‐ArdenneRIBP EA 4707, SFR Condorcet FR CNRS 3417Reims51100France
| | - Fabienne Baillieul
- University of Reims Champagne‐ArdenneRIBP EA 4707, SFR Condorcet FR CNRS 3417Reims51100France
| | - Sylvain Cordelier
- University of Reims Champagne‐ArdenneRIBP EA 4707, SFR Condorcet FR CNRS 3417Reims51100France
| | - Jérôme Crouzet
- University of Reims Champagne‐ArdenneRIBP EA 4707, SFR Condorcet FR CNRS 3417Reims51100France
| | - Stéphan Dorey
- University of Reims Champagne‐ArdenneRIBP EA 4707, SFR Condorcet FR CNRS 3417Reims51100France
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Genome-wide identification of Pseudomonas syringae genes required for fitness during colonization of the leaf surface and apoplast. Proc Natl Acad Sci U S A 2019; 116:18900-18910. [PMID: 31484768 DOI: 10.1073/pnas.1908858116] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The foliar plant pathogen Pseudomonas syringae can establish large epiphytic populations on leaf surfaces before apoplastic colonization. However, the bacterial genes that contribute to these lifestyles have not been completely defined. The fitness contributions of 4,296 genes in P. syringae pv. syringae B728a were determined by genome-wide fitness profiling with a randomly barcoded transposon mutant library that was grown on the leaf surface and in the apoplast of the susceptible plant Phaseolus vulgaris Genes within the functional categories of amino acid and polysaccharide (including alginate) biosynthesis contributed most to fitness both on the leaf surface (epiphytic) and in the leaf interior (apoplast), while genes involved in type III secretion system and syringomycin synthesis were primarily important in the apoplast. Numerous other genes that had not been previously associated with in planta growth were also required for maximum epiphytic or apoplastic fitness. Fourteen hypothetical proteins and uncategorized glycosyltransferases were also required for maximum competitive fitness in and on leaves. For most genes, no relationship was seen between fitness in planta and either the magnitude of their expression in planta or degree of induction in planta compared to in vitro conditions measured in other studies. A lack of association of gene expression and fitness has important implications for the interpretation of transcriptional information and our broad understanding of plant-microbe interactions.
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Lavanya SN, Udayashankar AC, Raj SN, Mohan CD, Gupta VK, Tarasatyavati C, Srivastava R, Nayaka SC. Lipopolysaccharide-induced priming enhances NO-mediated activation of defense responses in pearl millet challenged with Sclerospora graminicola. 3 Biotech 2018; 8:475. [PMID: 30456009 PMCID: PMC6226417 DOI: 10.1007/s13205-018-1501-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Accepted: 11/01/2018] [Indexed: 01/13/2023] Open
Abstract
Lipopolysaccharide (LPS) elicitors isolated from Pseudomonas fluorescens UOM SAR 14 effectively induced systemic and durable resistance against pearl millet downy mildew disease caused by the oomycete Sclerospora graminicola. Rapid and increased callose deposition and H2O2 accumulation were evidenced in downy mildew susceptible seeds pre-treated with LPS (SLPS) in comparison with the control seedlings, which also correlated with expression of various other defense responses. Biochemical analysis of enzymes and quantitative real-time polymerase chain reaction data suggested that LPS protects pearl millet against downy mildew through the activation of plant defense mechanisms such as generation of nitric oxide (NO), increased expression, and activities of defense enzymes and proteins. Elevation of NO concentrations was shown to be essential for LPS-mediated defense manifestation in pearl millet and had an impact on the other downstream defense responses like enhanced activation of enzymes and pathogen-related (PR) proteins. Temporal expression analysis of defense enzymes and PR-proteins in SLPS seedlings challenged with the downy mildew pathogen revealed that the activity and expression of peroxidase, phenylalanine ammonia lyase, and the PR-proteins (PR-1 and PR-5) were significantly enhanced compared to untreated control. Higher gene expression and protein activities of hydroxyproline-rich glycoproteins (HRGPs) were observed in SLPS seedlings which were similar to that of the resistant check. Collectively, our results suggest that, in pearl millet-downy mildew interaction, LPS pre-treatment affects defense signaling through the central regulator NO which triggers the activities of PAL, POX, PR-1, PR-5, and HRGPs.
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Affiliation(s)
- S. N. Lavanya
- Department of Studies in Biotechnology, University of Mysore, Manasagangotri, Mysore, 570006 India
| | - A. C. Udayashankar
- Department of Studies in Biotechnology, University of Mysore, Manasagangotri, Mysore, 570006 India
| | - S. Niranjan Raj
- Department of Studies in Microbiology, Karnataka State Open University, Mukthagangotri, Mysore, 570006 India
| | | | - V. K. Gupta
- ERA Chair of Green Chemistry, Department of Chemistry and Biotechnology, School of Science, Tallinn University of Technology, Tallinn, Estonia
| | - C. Tarasatyavati
- All India Coordinated Research Project on Pearl Millet, Indian Council of Agricultural Research, Mandor, Jodhpur, Rajasthan 342304 India
| | - R. Srivastava
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Telangana 502324 India
| | - S. Chandra Nayaka
- Department of Studies in Biotechnology, University of Mysore, Manasagangotri, Mysore, 570006 India
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Vallejo-Ochoa J, López-Marmolejo M, Hernández-Esquivel AA, Méndez-Gómez M, Suárez-Soria LN, Castro-Mercado E, García-Pineda E. Early plant growth and biochemical responses induced by Azospirillum brasilense Sp245 lipopolysaccharides in wheat (Triticum aestivum L.) seedlings are attenuated by procyanidin B2. PROTOPLASMA 2018; 255:685-694. [PMID: 29110138 DOI: 10.1007/s00709-017-1180-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Accepted: 10/26/2017] [Indexed: 06/07/2023]
Abstract
This study analyzes the effects of procyanidin B2 on early wheat plant growth and plant biochemical responses promoted by lipopolysaccharides (LPS) derived from the rhizobacteria Azospirillum brasilense Sp245. Measurements of leaf, root length, fresh weight, and dry weight showed in vitro plant growth stimulation 4 days after treatment with A. brasilense as well as LPS. Superoxide anion (O2·-) and hydrogen peroxide (H2O2) levels increased in seedling roots treated with LPS (100 μg mL-1). The chlorophyll content in leaf decreased while the starch content increased 24 h after treatment in seedling roots. The LPS treatment induced a high increase in total peroxidase (POX) (EC 1.11.1.7) activity and ionically bound cell wall POX content in roots, when compared to respective controls. Early plant growth and biochemical responses observed in wheat seedlings treated with LPS were inhibited by the addition of procyanidin B2 (5 μg mL-1), a B type proanthocyanidin (PAC), plant-derived polyphenolic compound with binding properties of LPS. All results suggest first that the ionically bound cell wall POX enzymes could be a molecular target of A. brasilense LPS, and second that the recognition or association of LPS by plant cells is required to activate plant responses. This last event could play a critical role during plant growth regulation by A. brasilense LPS.
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Affiliation(s)
- Juan Vallejo-Ochoa
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Ciudad Universitaria, Edificio A1´, 58040, Morelia, Michoacan, Mexico
| | - Mariel López-Marmolejo
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Ciudad Universitaria, Edificio A1´, 58040, Morelia, Michoacan, Mexico
| | - Alma Alejandra Hernández-Esquivel
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Ciudad Universitaria, Edificio A1´, 58040, Morelia, Michoacan, Mexico
| | - Manuel Méndez-Gómez
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Ciudad Universitaria, Edificio A1´, 58040, Morelia, Michoacan, Mexico
| | - Laura Nicolasa Suárez-Soria
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Ciudad Universitaria, Edificio A1´, 58040, Morelia, Michoacan, Mexico
| | - Elda Castro-Mercado
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Ciudad Universitaria, Edificio A1´, 58040, Morelia, Michoacan, Mexico
| | - Ernesto García-Pineda
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Ciudad Universitaria, Edificio A1´, 58040, Morelia, Michoacan, Mexico.
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26
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Signaling through plant lectins: modulation of plant immunity and beyond. Biochem Soc Trans 2018; 46:217-233. [PMID: 29472368 DOI: 10.1042/bst20170371] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Revised: 01/10/2018] [Accepted: 01/13/2018] [Indexed: 12/12/2022]
Abstract
Lectins constitute an abundant group of proteins that are present throughout the plant kingdom. Only recently, genome-wide screenings have unraveled the multitude of different lectin sequences within one plant species. It appears that plants employ a plurality of lectins, though relatively few lectins have already been studied and functionally characterized. Therefore, it is very likely that the full potential of lectin genes in plants is underrated. This review summarizes the knowledge of plasma membrane-bound lectins in different biological processes (such as recognition of pathogen-derived molecules and symbiosis) and illustrates the significance of soluble intracellular lectins and how they can contribute to plant signaling. Altogether, the family of plant lectins is highly complex with an enormous diversity in biochemical properties and activities.
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27
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Effect of bacterial lipopolysaccharides on morphogenetic activity in wheat somatic calluses. World J Microbiol Biotechnol 2017; 34:3. [PMID: 29204736 DOI: 10.1007/s11274-017-2386-3] [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: 08/23/2017] [Accepted: 11/24/2017] [Indexed: 10/18/2022]
Abstract
We evaluated the effect of lipopolysaccharides from the plant-growth-promoting associative bacterium Azospirillum brasilense Sp245 and from the enteric bacterium Escherichia coli K12 on the morphogenic potential of in vitro-growing somatic calluses of soft spring wheat (Triticum aestivum L. cv. Saratovskaya 29). A genetic model was used that included two near-isogenic lines of T. aestivum L. cv. Saratovskaya 29 with different embryogenic capacities; one of these lines carries the Rht-B1 dwarfing gene, whereas the other lacks it. When added to the nutrient medium, the lipopolysaccharide of A. brasilense Sp245 promoted the formation of calluses with meristematic centers and stimulated the regeneration ability of the cultured tissues in both lines. By contrast, the lipopolysaccharide of the enteric bacterium E. coli K12 barely affected the morphogenetic activity of callus cells and the yield of morphogenic calluses and regenerated plants. These findings indicate that the lipopolysaccharide of the plant-growth-promoting associative bacterium A. brasilense Sp245 specifically enhances the morphogenetic activity of wheat somatic tissues, which increases the efficacy of culturing of genotypes with a relatively low morphogenic potential. The results of the study may contribute to the improvement of the efficacy of plant cell selection and gene engineering and to a better understanding of the mechanisms responsible for plant recognition of lipopolysaccharides of associative bacteria.
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28
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Lucas JA, Garcia-Villaraco Velasco A, Ramos B, Gutierrez-Mañero FJ. Changes of enzyme activities related to oxidative stress in rice plants inoculated with random mutants of a Pseudomonas fluorescens strain able to improve plant fitness upon biotic and abiotic conditions. FUNCTIONAL PLANT BIOLOGY : FPB 2017; 44:1063-1074. [PMID: 32480633 DOI: 10.1071/fp17022] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2016] [Accepted: 06/30/2017] [Indexed: 06/11/2023]
Abstract
The Pseudomonas fluorescens strain used in this work (Aur 6) has demonstrated its ability to improve fitness of different plant species upon biotic and abiotic stress conditions. Random mutants of this strain were constructed with the Tn5 transposon technology, and biological tests to evaluate loss of salt protection were conducted with all the mutants (104 mutants) on rice seedlings. Mutant 33 showed an evident reduction in its ability to protect plants upon salt stress challenge, whereas mutant 19 was more effective than the wild type. Enzymes related with oxidative stress were studied in both mutants and wild type. Enzyme activities were decreased with mutant 33 with regard to wild type, whereas mutant 19 did not produce important changes suggesting involvement of redox balance associated to the observed modifications in these antioxidant enzymes as one of the probable mechanisms used by these strains. Data of malondialdehyde (MDA) were consistent with this fact. Mutants also affected accumulation of proline, the most common osmolyte in plants. A second experiment to evaluate the ability of both mutants and wild type to stimulate growth on tomato plants was conducted, as this feature was previously demonstrated by wild type. Similar results were obtained in growth of both species, suggesting that mutations of both mutants are related with the capacities of the wild type to stimulate growth. To reveal mutated genes, both mutants were mapped. Three mutated genes were found in mutant 33. A gene related with a general secretion pathway protein D, a gene related with a putative two-component system sensor kinase (ColS), and a gene related with flagellar motor switch protein (FliG). In mutant 19, two mutated genes were found. One gene related with heavy metal efflux pump Czca family, and other gene of 16s rRNA.
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Affiliation(s)
- Jose A Lucas
- Universidad San Pablo CEU, Dept. Pharmaceutical Science and Health, Facultad Farmacia, Urb. Monteprincipe, Boadilla del Monte, 28668 Madrid, Spain
| | - Ana Garcia-Villaraco Velasco
- Universidad San Pablo CEU, Dept. Pharmaceutical Science and Health, Facultad Farmacia, Urb. Monteprincipe, Boadilla del Monte, 28668 Madrid, Spain
| | - Beatriz Ramos
- Universidad San Pablo CEU, Dept. Pharmaceutical Science and Health, Facultad Farmacia, Urb. Monteprincipe, Boadilla del Monte, 28668 Madrid, Spain
| | - Francisco J Gutierrez-Mañero
- Universidad San Pablo CEU, Dept. Pharmaceutical Science and Health, Facultad Farmacia, Urb. Monteprincipe, Boadilla del Monte, 28668 Madrid, Spain
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29
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Kupferschmied P, Chai T, Flury P, Blom J, Smits THM, Maurhofer M, Keel C. Specific surface glycan decorations enable antimicrobial peptide resistance in plant-beneficial pseudomonads with insect-pathogenic properties. Environ Microbiol 2017; 18:4265-4281. [PMID: 27727519 DOI: 10.1111/1462-2920.13571] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Accepted: 10/06/2016] [Indexed: 11/29/2022]
Abstract
Some plant-beneficial pseudomonads can invade and kill pest insects in addition to their ability to protect plants from phytopathogens. We explored the genetic basis of O-polysaccharide (O-PS, O-antigen) biosynthesis in the representative insecticidal strains Pseudomonas protegens CHA0 and Pseudomonas chlororaphis PCL1391 and investigated its role in insect pathogenicity. Both strains produce two distinct forms of O-PS, but differ in the organization of their O-PS biosynthesis clusters. Biosynthesis of the dominant O-PS in both strains depends on a gene cluster similar to the O-specific antigen (OSA) cluster of Pseudomonas aeruginosa. In CHA0 and other P. protegens strains, the OSA cluster is extensively reduced and new clusters were acquired, resulting in high diversity of O-PS structures, possibly reflecting adaptation to different hosts. CHA0 mutants lacking the short OSA form of O-PS were significantly impaired in insect virulence in Galleria injection and Plutella feeding assays. CHA0, PCL1391, and other insecticidal pseudomonads exhibited high resistance to antimicrobial peptides, including cecropins that are central to insect immune defense. Resistance of both model strains depended on the dominant OSA-type O-PS. Our results suggest that O-antigen is essential for successful insect infection and illustrate, for the first time, its importance in resistance of Pseudomonas to antimicrobial peptides.
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Affiliation(s)
- Peter Kupferschmied
- Department of Fundamental Microbiology, University of Lausanne, Lausanne, Switzerland
| | - Tiancong Chai
- Department of Fundamental Microbiology, University of Lausanne, Lausanne, Switzerland
| | - Pascale Flury
- Plant Pathology, Institute of Integrative Biology, Swiss Federal Institute of Technology (ETH) Zurich, Zurich, Switzerland
| | - Jochen Blom
- Bioinformatics and Systems Biology, Justus-Liebig-University, Giessen, Germany
| | - Theo H M Smits
- Environmental Genomics and Systems Biology Research Group, Institute for Natural Resource Sciences, Zürich University of Applied Sciences, Wädenswil, Switzerland
| | - Monika Maurhofer
- Plant Pathology, Institute of Integrative Biology, Swiss Federal Institute of Technology (ETH) Zurich, Zurich, Switzerland
| | - Christoph Keel
- Department of Fundamental Microbiology, University of Lausanne, Lausanne, Switzerland
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Baloyi NM, Dubery IA, Piater LA. Proteomic analysis of Arabidopsis plasma membranes reveals lipopolysaccharide-responsive changes. Biochem Biophys Res Commun 2017; 486:1137-1142. [PMID: 28390899 DOI: 10.1016/j.bbrc.2017.04.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Accepted: 04/04/2017] [Indexed: 11/24/2022]
Abstract
Plant plasma membranes (PMs) contain pattern recognition receptors (PRRs), lately believed to be associated within multicomponent complexes, which perceive microbe-associated molecular pattern (MAMP) molecules like lipopolysaccharides (LPSs) and result in signal transduction events that lead to activated immune defense responses. As such, Arabidopsis thaliana leaves were treated with LPS from Escherichia coli (LPSE.coli) over time, and PM fractions isolated and evaluated using gel-based and subsequent mass spectrometry approaches for identification of LPS-responsive proteins. From the identified protein bands and spots, it is concluded that perception of hexaacylated LPS and resulting signal transduction occurs via PM-associated protein(s), amongst others, receptor-like kinases (RLKs) including G-type lectin S-receptor kinase and BAK1, and mostly likely within specialized perception domains.
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Affiliation(s)
- Nwaxigombe M Baloyi
- Department of Biochemistry, University of Johannesburg, Auckland Park, Johannesburg, South Africa
| | - Ian A Dubery
- Department of Biochemistry, University of Johannesburg, Auckland Park, Johannesburg, South Africa
| | - Lizelle A Piater
- Department of Biochemistry, University of Johannesburg, Auckland Park, Johannesburg, South Africa.
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31
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Di Lorenzo F, Silipo A, Andersen Gersby LB, Palmigiano A, Lanzetta R, Garozzo D, Boyer C, Pruvost O, Newman MA, Molinaro A. Xanthomonas citri pv. citri Pathotypes: LPS Structure and Function as Microbe-Associated Molecular Patterns. Chembiochem 2017; 18:772-781. [PMID: 28186388 DOI: 10.1002/cbic.201600671] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Indexed: 12/13/2022]
Abstract
Xanthomonas citri pv. citri is the pathogen responsible for Asiatic citrus canker, one of the most serious citrus diseases worldwide. The lipopolysaccharide (LPS) molecule has been demonstrated to be involved in X. citri pv. citri virulence. Despite enormous progress in investigations of the molecular mechanisms for bacterial pathogenicity, determination of the detailed LPS structure-activity relationship is limited, as the current knowledge is mainly based on structural determination of one X. citri pv. citri strain. As X. citri pv. citri strains are distinguished into three main pathogenicity groups, we characterized the full structure of the LPS from two pathotypes that differ in their host-range specificity. This revealed an intriguing difference in LPS O-chain structure. We also tested the LPSs and isolated lipid A moieties for their ability to act as microbe-associated molecular patterns in Arabidopsis thaliana. Both LPS/lipid As induced ROS accumulation, but no difference was observed between the two pathotypes.
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Affiliation(s)
- Flaviana Di Lorenzo
- Department of Chemical Sciences, University of Naples Federico II, via Cinthia 4, 80126, Naples, Italy
| | - Alba Silipo
- Department of Chemical Sciences, University of Naples Federico II, via Cinthia 4, 80126, Naples, Italy
| | | | - Angelo Palmigiano
- CNR-Istituto per i Polimeri, Compositi e Biomateriali IPCB, via Gaifami 18, 95126, Catania, Italy
| | - Rosa Lanzetta
- Department of Chemical Sciences, University of Naples Federico II, via Cinthia 4, 80126, Naples, Italy
| | - Domenico Garozzo
- CNR-Istituto per i Polimeri, Compositi e Biomateriali IPCB, via Gaifami 18, 95126, Catania, Italy
| | - Claudine Boyer
- CIRAD, UMR Peuplements Végétaux et Bioagresseurs en Milieu Tropical (PVBMT), Saint Pierre, La Réunion, France
| | - Olivier Pruvost
- CIRAD, UMR Peuplements Végétaux et Bioagresseurs en Milieu Tropical (PVBMT), Saint Pierre, La Réunion, France
| | - Mari-Anne Newman
- Department of Plant and Environmental Sciences, University of Copenhagen, 1871, Frederiksberg, Copenhagen, Denmark
| | - Antonio Molinaro
- Department of Chemical Sciences, University of Naples Federico II, via Cinthia 4, 80126, Naples, Italy
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32
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Bourassa DV, Kannenberg EL, Sherrier DJ, Buhr RJ, Carlson RW. The Lipopolysaccharide Lipid A Long-Chain Fatty Acid Is Important for Rhizobium leguminosarum Growth and Stress Adaptation in Free-Living and Nodule Environments. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2017; 30:161-175. [PMID: 28054497 DOI: 10.1094/mpmi-11-16-0230-r] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Rhizobium bacteria live in soil and plant environments, are capable of inducing symbiotic nodules on legumes, invade these nodules, and develop into bacteroids that fix atmospheric nitrogen into ammonia. Rhizobial lipopolysaccharide (LPS) is anchored in the bacterial outer membrane through a specialized lipid A containing a very long-chain fatty acid (VLCFA). VLCFA function for rhizobial growth in soil and plant environments is not well understood. Two genes, acpXL and lpxXL, encoding acyl carrier protein and acyltransferase, are among the six genes required for biosynthesis and transfer of VLCFA to lipid A. Rhizobium leguminosarum mutant strains acpXL, acpXL-/lpxXL-, and lpxXL- were examined for LPS structure, viability, and symbiosis. Mutations in acpXL and lpxXL abolished VLCFA attachment to lipid A. The acpXL mutant transferred a shorter acyl chain instead of VLCFA. Strains without lpxXL neither added VLCFA nor a shorter acyl chain. In all strains isolated from nodule bacteria, lipid A had longer acyl chains compared with laboratory-cultured bacteria, whereas mutant strains displayed altered membrane properties, modified cationic peptide sensitivity, and diminished levels of cyclic β-glucans. In pea nodules, mutant bacteroids were atypically formed and nitrogen fixation and senescence were affected. The role of VLCFA for rhizobial environmental fitness is discussed.
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Affiliation(s)
- Dianna V Bourassa
- 1 Complex Carbohydrate Research Center, University of Georgia, Athens 30602, U.S.A
- 3 U.S. National Poultry Research Center, Agricultural Research Service, United States Department of Agriculture, Athens, GA 30605, U.S.A
| | - Elmar L Kannenberg
- 1 Complex Carbohydrate Research Center, University of Georgia, Athens 30602, U.S.A
| | - D Janine Sherrier
- 2 Department of Plant and Soil Sciences and Delaware Biotechnology Institute, University of Delaware, Newark 19711, U.S.A.; and
| | - R Jeffrey Buhr
- 3 U.S. National Poultry Research Center, Agricultural Research Service, United States Department of Agriculture, Athens, GA 30605, U.S.A
| | - Russell W Carlson
- 1 Complex Carbohydrate Research Center, University of Georgia, Athens 30602, U.S.A
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Hersemann L, Wibberg D, Blom J, Goesmann A, Widmer F, Vorhölter FJ, Kölliker R. Comparative genomics of host adaptive traits in Xanthomonas translucens pv. graminis. BMC Genomics 2017; 18:35. [PMID: 28056815 PMCID: PMC5217246 DOI: 10.1186/s12864-016-3422-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2016] [Accepted: 12/14/2016] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND Xanthomonas translucens pathovars differ in their individual host ranges among Poaceae. As the causal agent of bacterial wilt in Italian ryegrass (Lolium multiflorum Lam.), X. translucens pv. graminis (Xtg) is one of the most important bacterial pathogens in temperate grassland regions. The genomes of six Xtg strains from Switzerland, Norway, and New Zealand were sequenced in order to gain insight into conserved genomic traits from organisms covering a wide geographical range. Subsequent comparative analysis with previously published genome data of seven non-graminis X. translucens strains including the pathovars arrhenatheri, poae, phlei, cerealis, undulosa, and translucens was conducted to identify candidate genes linked to the host adaptation of Xtg to Italian ryegrass. RESULTS Phylogenetic analysis revealed a tight clustering of Xtg strains, which were found to share a large core genome. Conserved genomic traits included a non-canonical type III secretion system (T3SS) and a type IV pilus (T4P), which both revealed distinct primary structures of the pilins when compared to the non-graminis X. translucens strains. Xtg-specific traits that had no homologues in the other X. translucens strains were further found to comprise several hypothetical proteins, a TonB-dependent receptor, transporters, and effector proteins as well as toxin-antitoxin systems and DNA methyltransferases. While a nearly complete flagellar gene cluster was identified in one of the sequenced Xtg strains, phenotypic analysis pointed to swimming-deficiency as a common trait of the pathovar graminis. CONCLUSION Our study suggests that host adaptation of X. translucens pv. graminis may be conferred by a combination of pathovar-specific effector proteins, regulatory mechanisms, and adapted nutrient acquisition. Sequence deviations of pathogen-associated molecular patterns (PAMPs), as observed for the pilins of the T4P and T3SS, are moreover likely to impede perception by the plant defense machinery and thus facilitate successful host colonization of Italian ryegrass.
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Affiliation(s)
| | - Daniel Wibberg
- Center for Biotechnology, Bielefeld University, 33615, Bielefeld, Germany
| | - Jochen Blom
- Bioinformatics and Systems Biology, Justus Liebig University Giessen, 35392, Giessen, Germany
| | - Alexander Goesmann
- Bioinformatics and Systems Biology, Justus Liebig University Giessen, 35392, Giessen, Germany
| | - Franco Widmer
- Molecular Ecology, Agroscope, 8046, Zurich, Switzerland
| | - Frank-Jörg Vorhölter
- Center for Biotechnology, Bielefeld University, 33615, Bielefeld, Germany
- MVZ Dr. Eberhard & Partner Dortmund, 44137, Dortmund, Germany
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34
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Girija AM, Kinathi BK, Madhavi MB, Ramesh P, Vungarala S, Patel HK, Sonti RV. Rice Leaf Transcriptional Profiling Suggests a Functional Interplay Between Xanthomonas oryzae pv. oryzae Lipopolysaccharide and Extracellular Polysaccharide in Modulation of Defense Responses During Infection. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2017; 30:16-27. [PMID: 27918246 DOI: 10.1094/mpmi-08-16-0157-r] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Treatment of rice leaves with isolated Xanthomonas oryzae pv. oryzae lipopolysaccharide (LPS) induces the production of callose deposits, reactive oxygen species, and enhanced resistance against subsequent bacterial infection. Expression profiling of X. oryzae pv. oryzae LPS-treated rice (Oryza sativa subsp. indica) leaves showed that genes involved in the biosynthetic pathways for lignins, phenylpropanoids, chorismate, phenylalanine, salicylic acid, and ethylene, as well as a number of pathogenesis-related proteins are up-regulated. Gene ontology categories like cell-wall organization, defense response, stress response, and protein phosphorylation/kinases were found to be upregulated, while genes involved in photosynthesis were down-regulated. Coinfiltration with xanthan gum, the xanthomonas extracellular polysaccharide (EPS), suppressed LPS-induced callose deposition. Gene expression analysis of rice leaves that are treated with an EPS-deficient mutant of X. oryzae pv. oryzae indicated that a number of defense-regulated functions are up-regulated during infection. These transcriptional responses are attenuated in rice leaves treated with an EPS-deficient mutant that is also deficient in the O-antigen component of LPS. Overall, these results suggest that the O-antigen component of X. oryzae pv. oryzae LPS induces rice defense responses during infection and that these are suppressed by bacterial EPS.
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Affiliation(s)
| | - Bipin Kumar Kinathi
- CSIR-Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500007, India
| | - Mylavarapu B Madhavi
- CSIR-Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500007, India
| | - Palaparthi Ramesh
- CSIR-Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500007, India
| | - Sridivya Vungarala
- CSIR-Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500007, India
| | - Hitendra Kumar Patel
- CSIR-Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500007, India
| | - Ramesh V Sonti
- CSIR-Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500007, India
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Kalily E, Hollander A, Korin B, Cymerman I, Yaron S. Mechanisms of resistance to linalool inSalmonellaSenftenberg and their role in survival on basil. Environ Microbiol 2016; 18:3673-3688. [DOI: 10.1111/1462-2920.13268] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2015] [Accepted: 02/14/2016] [Indexed: 11/30/2022]
Affiliation(s)
- Emmanuel Kalily
- Faculty of Biotechnology and Food Engineering; and The Russell Berrie Nanotechnology Institute, Technion - Israel Institute of Technology; Haifa Israel
| | - Amit Hollander
- Faculty of Biotechnology and Food Engineering; and The Russell Berrie Nanotechnology Institute, Technion - Israel Institute of Technology; Haifa Israel
| | - Ben Korin
- Faculty of Biotechnology and Food Engineering; and The Russell Berrie Nanotechnology Institute, Technion - Israel Institute of Technology; Haifa Israel
| | - Itamar Cymerman
- Faculty of Biotechnology and Food Engineering; and The Russell Berrie Nanotechnology Institute, Technion - Israel Institute of Technology; Haifa Israel
| | - Sima Yaron
- Faculty of Biotechnology and Food Engineering; and The Russell Berrie Nanotechnology Institute, Technion - Israel Institute of Technology; Haifa Israel
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Tadra-Sfeir MZ, Faoro H, Camilios-Neto D, Brusamarello-Santos L, Balsanelli E, Weiss V, Baura VA, Wassem R, Cruz LM, De Oliveira Pedrosa F, Souza EM, Monteiro RA. Genome wide transcriptional profiling of Herbaspirillum seropedicae SmR1 grown in the presence of naringenin. Front Microbiol 2015; 6:491. [PMID: 26052319 PMCID: PMC4440368 DOI: 10.3389/fmicb.2015.00491] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Accepted: 05/04/2015] [Indexed: 11/13/2022] Open
Abstract
Herbaspirillum seropedicae is a diazotrophic bacterium which associates endophytically with economically important gramineae. Flavonoids such as naringenin have been shown to have an effect on the interaction between H. seropedicae and its host plants. We used a high-throughput sequencing based method (RNA-Seq) to access the influence of naringenin on the whole transcriptome profile of H. seropedicae. Three hundred and four genes were downregulated and seventy seven were upregulated by naringenin. Data analysis revealed that genes related to bacterial flagella biosynthesis, chemotaxis and biosynthesis of peptidoglycan were repressed by naringenin. Moreover, genes involved in aromatic metabolism and multidrug transport efllux were actived.
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Affiliation(s)
- Michelle Z Tadra-Sfeir
- Nitrogen Fixation group, Department of Biochemistry and Molecular Biology, Universidade Federal do Paraná Curitiba, Brazil
| | - Helisson Faoro
- Nitrogen Fixation group, Department of Biochemistry and Molecular Biology, Universidade Federal do Paraná Curitiba, Brazil ; Instituto Carlos Chagas, Fundação Oswaldo Cruz, Fiocruz-PR Curitiba, Brazil
| | - Doumit Camilios-Neto
- Department of Biochemistry and Biotechnology, Universidade Estadual de Londrina Londrina, Brazil
| | - Liziane Brusamarello-Santos
- Nitrogen Fixation group, Department of Biochemistry and Molecular Biology, Universidade Federal do Paraná Curitiba, Brazil
| | - Eduardo Balsanelli
- Nitrogen Fixation group, Department of Biochemistry and Molecular Biology, Universidade Federal do Paraná Curitiba, Brazil
| | - Vinicius Weiss
- Nitrogen Fixation group, Department of Biochemistry and Molecular Biology, Universidade Federal do Paraná Curitiba, Brazil
| | - Valter A Baura
- Nitrogen Fixation group, Department of Biochemistry and Molecular Biology, Universidade Federal do Paraná Curitiba, Brazil
| | - Roseli Wassem
- Department of Genetics, Universidade Federal do Paraná Curitiba, Brazil
| | - Leonardo M Cruz
- Nitrogen Fixation group, Department of Biochemistry and Molecular Biology, Universidade Federal do Paraná Curitiba, Brazil
| | - Fábio De Oliveira Pedrosa
- Nitrogen Fixation group, Department of Biochemistry and Molecular Biology, Universidade Federal do Paraná Curitiba, Brazil
| | - Emanuel M Souza
- Nitrogen Fixation group, Department of Biochemistry and Molecular Biology, Universidade Federal do Paraná Curitiba, Brazil
| | - Rose A Monteiro
- Nitrogen Fixation group, Department of Biochemistry and Molecular Biology, Universidade Federal do Paraná Curitiba, Brazil
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Feasley CL, van der Wel H, West CM. Evolutionary diversity of social amoebae N-glycomes may support interspecific autonomy. Glycoconj J 2015; 32:345-59. [PMID: 25987342 DOI: 10.1007/s10719-015-9592-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Revised: 04/11/2015] [Accepted: 04/14/2015] [Indexed: 10/23/2022]
Abstract
Multiple species of cellular slime mold (CSM) amoebae share overlapping subterranean environments near the soil surface. Despite similar life-styles, individual species form independent starvation-induced fruiting bodies whose spores can renew the life cycle. N-glycans associated with the cell surface glycocalyx have been predicted to contribute to interspecific avoidance, resistance to pathogens, and prey preference. N-glycans from five CSM species that diverged 300-600 million years ago and whose genomes have been sequenced were fractionated into neutral and acidic pools and profiled by MALDI-TOF-MS. Glycan structure models were refined using linkage specific antibodies, exoglycosidase digestions, MALDI-MS/MS, and chromatographic studies. Amoebae of the type species Dictyostelium discoideum express modestly trimmed high mannose N-glycans variably modified with core α3-linked Fuc and peripherally decorated with 0-2 residues each of β-GlcNAc, Fuc, methylphosphate and/or sulfate, as reported previously. Comparative analyses of D. purpureum, D. fasciculatum, Polysphondylium pallidum, and Actyostelium subglobosum revealed that each displays a distinctive spectrum of high-mannose species with quantitative variations in the extent of these modifications, and qualitative differences including retention of Glc, mannose methylation, and absence of a peripheral GlcNAc, fucosylation, or sulfation. Starvation-induced development modifies the pattern in all species but, except for universally observed increased mannose-trimming, the N-glycans do not converge to a common profile. Correlations with glycogene repertoires will enable future reverse genetic studies to eliminate N-glycomic differences to test their functions in interspecific relations and pathogen evasion.
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Affiliation(s)
- Christa L Feasley
- Department of Biochemistry & Molecular Biology, Oklahoma Center for Medical Glycobiology, University of Oklahoma Health Sciences Center, 975 NE 10th St., BRC-415, OUHSC, Oklahoma City, OK, 73104, USA,
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Ramos-Solano B, Algar E, Gutierrez-Mañero FJ, Bonilla A, Lucas JA, García-Seco D. Bacterial bioeffectors delay postharvest fungal growth and modify total phenolics, flavonoids and anthocyanins in blackberries. Lebensm Wiss Technol 2015. [DOI: 10.1016/j.lwt.2014.11.051] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Mohamed KH, Daniel T, Aurélien D, El-Maarouf-Bouteau H, Rafik E, Arbelet-Bonnin D, Biligui B, Florence V, Mustapha EM, François B. Deciphering the dual effect of lipopolysaccharides from plant pathogenic Pectobacterium. PLANT SIGNALING & BEHAVIOR 2015; 10:e1000160. [PMID: 25760034 PMCID: PMC4622587 DOI: 10.1080/15592324.2014.1000160] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2014] [Accepted: 12/12/2014] [Indexed: 05/29/2023]
Abstract
Lipopolysaccharides (LPS) are a component of the outer cell surface of almost all Gram-negative bacteria and play an essential role for bacterial growth and survival. Lipopolysaccharides represent typical microbe-associated molecular pattern (MAMP) molecules and have been reported to induce defense-related responses, including the expression of defense genes and the suppression of the hypersensitive response in plants. However, depending on their origin and the challenged plant, LPS were shown to have complex and different roles. In this study we showed that LPS from plant pathogens Pectobacterium atrosepticum and Pectobacterium carotovorum subsp. carotovorum induce common and different responses in A. thaliana cells when compared to those induced by LPS from non-phytopathogens Escherichia coli and Pseudomonas aeruginosa. Among common responses to both types of LPS are the transcription of defense genes and their ability to limit of cell death induced by Pectobacterium carotovorum subsp carotovorum. However, the differential kinetics and amplitude in reactive oxygen species (ROS) generation seemed to regulate defense gene transcription and be determinant to induce programmed cell death in response to LPS from the plant pathogenic Pectobacterium. These data suggest that different signaling pathways could be activated by LPS in A. thaliana cells.
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Key Words
- AD, actinomycin D
- Chx, cycloheximide
- DPI, diphenylene iodonium
- EB, Evans Blue
- ETI, effector-triggered immunity
- HR, hypersensitive response
- LPS, lipopolysaccharides
- MAMP, microbe associated molecular pattern
- OPS, O-polysaccharide part
- PAMP, pathogen- associated molecular pattern
- PCD, programmed cell death
- PTI, PAMP triggered immunity
- Pa, Pectobacterium atrosepticum
- Pcc, Pectobacterium carotovorum carotovorum
- Pectobacterium spp
- ROS, reactive oxygen species
- Tiron, sodium 4,5-dihydroxybenzene-1,3-disulfonate
- defense responses
- lipopolysaccharides
- programmed cell death
- reactive oxygen species
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Affiliation(s)
- Kettani-Halabi Mohamed
- Université Paris Diderot-Paris 7; Institut des Energies de Demain (UMR8236); Paris, France
- LVHM–Université Hassan II Mohammedia – Casabalanca; FSTM, Maroc
| | - Tran Daniel
- Université Paris Diderot-Paris 7; Institut des Energies de Demain (UMR8236); Paris, France
| | - Dauphin Aurélien
- UPMC UMR-S975; Inserm U975; CNRS UMR 7225 Plateforme d'Imagerie cellulaire Pitié-Salpêtrière; GH Pitié-Salpêtrière; Paris, France
| | | | - Errakhi Rafik
- Université Paris Diderot-Paris 7; Institut des Energies de Demain (UMR8236); Paris, France
| | | | - Bernadette Biligui
- Université Paris Diderot-Paris 7; Institut des Energies de Demain (UMR8236); Paris, France
| | | | | | - Bouteau François
- Université Paris Diderot-Paris 7; Institut des Energies de Demain (UMR8236); Paris, France
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Mgcina LS, Dubery IA, Piater LA. Comparative conventional- and quantum dot-labeling strategies for LPS binding site detection in Arabidopsis thaliana mesophyll protoplasts. FRONTIERS IN PLANT SCIENCE 2015; 6:335. [PMID: 26029233 PMCID: PMC4428080 DOI: 10.3389/fpls.2015.00335] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Accepted: 04/28/2015] [Indexed: 05/10/2023]
Abstract
Lipopolysaccharide (LPS) from Gram-negative bacteria is recognized as a microbe-associated molecular pattern (MAMP) and not only induces an innate immune response in plants, but also stimulates the development of characteristic defense responses. However, identification and characterization of a cell surface LPS-receptor/binding site, as described in mammals, remains elusive in plants. As an amphiphilic, macromolecular lipoglycan, intact LPS potentially contains three MAMP-active regions, represented by the O-polysaccharide chain, the core and the lipid A. Binding site studies with intact labeled LPS were conducted in Arabidopsis thaliana protoplasts and quantified using flow cytometry fluorescence changes. Quantum dots (Qdots), which allow non-covalent, hydrophobic labeling were used as a novel strategy in this study and compared to covalent, hydrophilic labeling with Alexa 488. Affinity for LPS-binding sites was clearly demonstrated by concentration-, temperature-, and time-dependent increases in protoplast fluorescence following treatment with the labeled LPS. Moreover, this induced fluorescence increase was convincingly reduced following pre-treatment with excess unlabeled LPS, thereby indicating reversibility of LPS binding. Inhibition of the binding process is also reported using endo- and exocytosis inhibitors. Here, we present evidence for the anticipated presence of LPS-specific binding sites in Arabidopsis protoplasts, and furthermore propose Qdots as a more sensitive LPS-labeling strategy in comparison to the conventional Alexa 488 hydrazide label for binding studies.
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Affiliation(s)
| | | | - Lizelle A. Piater
- *Correspondence: Lizelle A. Piater, Department of Biochemistry, University of Johannesburg, Corner of Kingsway and University Road, Auckland Park 2006, Johannesburg, Gauteng, South Africa
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Wang JL, Chen L, Tang L, Zhao HB, Liu XS, Wang YF. 20-hydroxyecdysone transcriptionally regulates humoral immunity in the fat body of Helicoverpa armigera. INSECT MOLECULAR BIOLOGY 2014; 23:842-856. [PMID: 25224836 DOI: 10.1111/imb.12131] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
20-hydroxyecdysone (20E) increases its titre level during the wandering stage and influences innate immunity in many holometabolous insects. However, the function of 20E as an immune-activator or -suppressor needs to be determined. Here, the transcriptome of the peptidoglycan-challenged fat body of the cotton bollworm, Helicoverpa armigera, was analysed using Illumina sequencing technology. Overall, 32 073 unigenes were assembled with a mean length of 643 nucleotides. Gene expression dynamics in the fat body during the wandering stage and of peptidoglycan-challenged individuals were investigated by the digital gene expression system. Pattern recognition receptors [such as peptidoglycan recognition protein B (PGRP B), PGRP S2 precursor, C-type lectin 5, hemolin and β-1,3-glucan recognition protein 2a] and antimicrobial peptides (namely attacin, gloverin, gloverin precursor, gloverin-like, cecropin 2, cecropin D, cecropin D-like and i-type lysozyme) significantly increased their mRNA levels during the wandering stage. 20E treatment significantly induced the expression of these genes. Antibacterial activities were also enhanced during the wandering stage and after 20E injections. Bacillus subtilis peptidoglycan induced the expression of PGRP D, PGRP B, PGRP S2 precursor, gloverin, gloverin precursor, gloverin-like, cecropin 2, cecropin D and lebocin-like genes. These results demonstrate that 20E acts by enhancing humoral immunity in H. armigera.
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Affiliation(s)
- J-L Wang
- Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, Wuhan, China
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Wiesel L, Newton AC, Elliott I, Booty D, Gilroy EM, Birch PRJ, Hein I. Molecular effects of resistance elicitors from biological origin and their potential for crop protection. FRONTIERS IN PLANT SCIENCE 2014; 5:655. [PMID: 25484886 PMCID: PMC4240061 DOI: 10.3389/fpls.2014.00655] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2014] [Accepted: 11/04/2014] [Indexed: 05/17/2023]
Abstract
Plants contain a sophisticated innate immune network to prevent pathogenic microbes from gaining access to nutrients and from colonizing internal structures. The first layer of inducible response is governed by the plant following the perception of microbe- or modified plant-derived molecules. As the perception of these molecules results in a plant response that can provide efficient resistance toward non-adapted pathogens they can also be described as "defense elicitors." In compatible plant/microbe interactions, adapted microorganisms have means to avoid or disable this resistance response and promote virulence. However, this requires a detailed spatial and temporal response from the invading pathogens. In agricultural practice, treating plants with isolated defense elicitors in the absence of pathogens can promote plant resistance by uncoupling defense activation from the effects of pathogen virulence determinants. The plant responses to plant, bacterial, oomycete, or fungal-derived elicitors are not, in all cases, universal and need elucidating prior to the application in agriculture. This review provides an overview of currently known elicitors of biological rather than synthetic origin and places their activity into a molecular context.
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Affiliation(s)
- Lea Wiesel
- Cell and Molecular Sciences, The James Hutton InstituteDundee, UK
| | - Adrian C. Newton
- Cell and Molecular Sciences, The James Hutton InstituteDundee, UK
| | | | | | | | - Paul R. J. Birch
- Cell and Molecular Sciences, The James Hutton InstituteDundee, UK
- The Division of Plant Sciences, College of Life Science, University of Dundee at the James Hutton InstituteDundee, UK
| | - Ingo Hein
- Cell and Molecular Sciences, The James Hutton InstituteDundee, UK
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Ellinger D, Voigt CA. Callose biosynthesis in Arabidopsis with a focus on pathogen response: what we have learned within the last decade. ANNALS OF BOTANY 2014; 114:1349-58. [PMID: 24984713 PMCID: PMC4195556 DOI: 10.1093/aob/mcu120] [Citation(s) in RCA: 126] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2014] [Accepted: 04/16/2014] [Indexed: 05/18/2023]
Abstract
BACKGROUND (1,3)-β-Glucan callose is a cell wall polymer that is involved in several fundamental biological processes, ranging from plant development to the response to abiotic and biotic stresses. Despite its importance in maintaining plant integrity and plant defence, knowledge about the regulation of callose biosynthesis at its diverse sites of action within the plant is still limited. The moderately sized family of GSL (GLUCAN SYNTHASE-LIKE) genes is predicted to encode callose synthases with a specific biological function and subcellular localization. Phosphorylation and directed translocation of callose synthases seem to be key post-translational mechanisms of enzymatic regulation, whereas transcriptional control of GSL genes might only have a minor function in response to biotic or abiotic stresses. SCOPE AND CONCLUSIONS Among the different sites of callose biosynthesis within the plant, particular attention has been focused on the formation of callose in response to pathogen attack. Here, callose is deposited between the plasma membrane and the cell wall to act as a physical barrier to stop or slow invading pathogens. Arabidopsis (Arabidopsis thaliana) is one of the best-studied models not only for general plant defence responses but also for the regulation of pathogen-induced callose biosynthesis. Callose synthase GSL5 (GLUCAN SYNTHASE-LIKE5) has been shown to be responsible for stress-induced callose deposition. Within the last decade of research into stress-induced callose, growing evidence has been found that the timing of callose deposition in the multilayered system of plant defence responses could be the key parameter for optimal effectiveness. This timing seems to be achieved through co-ordinated transport and formation of the callose synthase complex.
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Affiliation(s)
- Dorothea Ellinger
- Phytopathology and Biochemistry, Biocenter Klein Flottbek, University of Hamburg, Ohnhorststrasse 18, 22609 Hamburg, Germany
| | - Christian A Voigt
- Phytopathology and Biochemistry, Biocenter Klein Flottbek, University of Hamburg, Ohnhorststrasse 18, 22609 Hamburg, Germany
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Saubeau G, Gaillard F, Legentil L, Nugier-Chauvin C, Ferrières V, Andrivon D, Val F. Identification of three elicitins and a galactan-based complex polysaccharide from a concentrated culture filtrate of Phytophthora infestans efficient against Pectobacterium atrosepticum. Molecules 2014; 19:15374-90. [PMID: 25264828 PMCID: PMC6270706 DOI: 10.3390/molecules191015374] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Revised: 09/10/2014] [Accepted: 09/15/2014] [Indexed: 12/21/2022] Open
Abstract
The induction of plant immunity by Pathogen Associated Molecular Patterns (PAMPs) constitutes a powerful strategy for crop protection. PAMPs indeed induce general defense responses in plants and thus increase plant resistance to pathogens. Phytophthora infestans culture filtrates (CCFs) are known to induce defense responses and decrease the severity of soft rot due to Pectobacterium atrosepticum in potato tubers. The aim of this study was to identify and characterize the active compounds from P. infestans filtrate. The filtrate was fractionated by gel filtration, and the protection effects against P. atrosepticum and the ability to induce PAL activity were tested for each fraction. The fraction active in protection (F1) also induced PAL activity, as did the whole filtrate. Three elicitins (INF1, INF4 and INF5) were identified in F1b, subfraction of F1, by MALDI-TOF-MS and MS/MS analyses. However, deproteinized F1b still showed biological activity against the bacterium, revealing the presence of an additional active compound. GC-MS analyses of the deproteinized fraction highlighted the presence of a galactan-based complex polysaccharide. These experiments demonstrate that the biological activity of the CCF against P. atrosepticum results from a combined action of three elicitins and a complex polysaccharide, probably through the activation of general defense responses.
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Affiliation(s)
| | - Fanny Gaillard
- CNRS-Université Pierre et Marie Curie, FR2424, Station Biologique de Roscoff, Roscoff-Cedex 29682, France.
| | - Laurent Legentil
- Ecole Nationale Supérieure de Chimie de Rennes, CNRS, UMR 6226, 11 Allée de Beaulieu, CS 50837, Rennes Cedex 7 35708, France.
| | - Caroline Nugier-Chauvin
- Ecole Nationale Supérieure de Chimie de Rennes, CNRS, UMR 6226, 11 Allée de Beaulieu, CS 50837, Rennes Cedex 7 35708, France.
| | - Vincent Ferrières
- Ecole Nationale Supérieure de Chimie de Rennes, CNRS, UMR 6226, 11 Allée de Beaulieu, CS 50837, Rennes Cedex 7 35708, France.
| | | | - Florence Val
- Agrocampus Ouest, UMR1349 IGEPP, Rennes F-35000, France.
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Veluchamy S, Hind SR, Dunham DM, Martin GB, Panthee DR. Natural variation for responsiveness to flg22, flgII-28, and csp22 and Pseudomonas syringae pv. tomato in heirloom tomatoes. PLoS One 2014; 9:e106119. [PMID: 25180693 PMCID: PMC4152135 DOI: 10.1371/journal.pone.0106119] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2014] [Accepted: 07/28/2014] [Indexed: 11/26/2022] Open
Abstract
Tomato (Solanum lycopersicum L.) is susceptible to many diseases including bacterial speck caused by Pseudomonas syringae pv. tomato. Bacterial speck disease is a serious problem worldwide in tomato production areas where moist conditions and cool temperatures occur. To enhance breeding of speck resistant fresh-market tomato cultivars we identified a race 0 field isolate, NC-C3, of P. s. pv. tomato in North Carolina and used it to screen a collection of heirloom tomato lines for speck resistance in the field. We observed statistically significant variation among the heirloom tomatoes for their response to P. s. pv. tomato NC-C3 with two lines showing resistance approaching a cultivar that expresses the Pto resistance gene, although none of the heirloom lines have Pto. Using an assay that measures microbe-associated molecular pattern (MAMP)-induced production of reactive oxygen species (ROS), we investigated whether the heirloom lines showed differential responsiveness to three bacterial-derived peptide MAMPs: flg22 and flgII-28 (from flagellin) and csp22 (from cold shock protein). Significant differences were observed for MAMP responsiveness among the lines, although these differences did not correlate strongly with resistance or susceptibility to bacterial speck disease. The identification of natural variation for MAMP responsiveness opens up the possibility of using a genetic approach to identify the underlying loci and to facilitate breeding of cultivars with enhanced disease resistance. Towards this goal, we discovered that responsiveness to csp22 segregates as a single locus in an F2 population of tomato.
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Affiliation(s)
- Selvakumar Veluchamy
- Department of Horticultural Science, North Carolina State University, Mountain Horticultural Crops Research and Extension Center, Mills River, North Carolina, United States of America
| | - Sarah R. Hind
- Boyce Thompson Institute for Plant Research, Ithaca, New York, United States of America
| | - Diane M. Dunham
- Boyce Thompson Institute for Plant Research, Ithaca, New York, United States of America
| | - Gregory B. Martin
- Boyce Thompson Institute for Plant Research, Ithaca, New York, United States of America
- Department of Plant Pathology and Plant-Microbe Biology, Cornell University, Ithaca, New York, United States of America
| | - Dilip R. Panthee
- Department of Horticultural Science, North Carolina State University, Mountain Horticultural Crops Research and Extension Center, Mills River, North Carolina, United States of America
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Algar E, Gutierrez-Mañero FJ, Garcia-Villaraco A, García-Seco D, Lucas JA, Ramos-Solano B. The role of isoflavone metabolism in plant protection depends on the rhizobacterial MAMP that triggers systemic resistance against Xanthomonas axonopodis pv. glycines in Glycine max (L.) Merr. cv. Osumi. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2014; 82:9-16. [PMID: 24869797 DOI: 10.1016/j.plaphy.2014.05.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2014] [Accepted: 05/03/2014] [Indexed: 05/28/2023]
Abstract
Glycine max (L.) Merr. plays a crucial role in both the field of food and the pharmaceutical industry due to their input as plant protein and to the benefits of isoflavones (IF) for health. In addition, IF play a key role in nodulation and plant defense and therefore, an increase in IF would be desirable for better field performance. IF are secondary metabolites and therefore, inducible, so finding effective agents to increase IF contents is interesting. Among these agents, plant growth promoting rhizobacteria (PGPR) have been used to trigger systemic induction of plant's secondary metabolism through their microbe associated molecular patterns (MAMPs) that fit in the plant's receptors to start a systemic response. The aim of this study was to evaluate the ability of 4 PGPR that had a contrasted effect on IF metabolism, to protect plants against biotic stress and to establish the relation between IF profile and the systemic response triggered by the bacteria. Apparently, the response involves a lower sensitivity to ethylene and despite the decrease in effective photosynthesis, growth is only compromised in the case of M84, the most effective in protection. All strains protected soybean against Xanthomonas axonopodis pv. glycines (M84 > N5.18 > Aur9>N21.4) and only M84 and N5.18 involved IF. N5.18 stimulated accumulation of IF before pathogen challenge. M84 caused a significant increase on IF only after pathogen challenge and N21.4 caused a significant increase on IF content irrespective of pathogen challenge. Aur9 did not affect IF. These results point out that all 4 strains have MAMPs that trigger defensive metabolism in soybean. Protection induced by N21.4 and Aur9 involves other metabolites different to IF and the role of IF in defence depends on the previous metabolic status of the plant and on the bacterial MAMP.
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Affiliation(s)
- Elena Algar
- Department of Pharmaceutical Sciences and Health, Faculty of Pharmacy, San Pablo CEU University, PO Box 67, Boadilla del Monte, 28668 Madrid, Spain.
| | - F Javier Gutierrez-Mañero
- Department of Pharmaceutical Sciences and Health, Faculty of Pharmacy, San Pablo CEU University, PO Box 67, Boadilla del Monte, 28668 Madrid, Spain.
| | - Ana Garcia-Villaraco
- Department of Pharmaceutical Sciences and Health, Faculty of Pharmacy, San Pablo CEU University, PO Box 67, Boadilla del Monte, 28668 Madrid, Spain.
| | - Daniel García-Seco
- Department of Pharmaceutical Sciences and Health, Faculty of Pharmacy, San Pablo CEU University, PO Box 67, Boadilla del Monte, 28668 Madrid, Spain.
| | - J Antonio Lucas
- Department of Pharmaceutical Sciences and Health, Faculty of Pharmacy, San Pablo CEU University, PO Box 67, Boadilla del Monte, 28668 Madrid, Spain.
| | - Beatriz Ramos-Solano
- Department of Pharmaceutical Sciences and Health, Faculty of Pharmacy, San Pablo CEU University, PO Box 67, Boadilla del Monte, 28668 Madrid, Spain.
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Schmelz EA, Huffaker A, Sims JW, Christensen SA, Lu X, Okada K, Peters RJ. Biosynthesis, elicitation and roles of monocot terpenoid phytoalexins. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2014; 79:659-78. [PMID: 24450747 DOI: 10.1111/tpj.12436] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2013] [Revised: 12/22/2013] [Accepted: 01/10/2014] [Indexed: 05/07/2023]
Abstract
A long-standing goal in plant research is to optimize the protective function of biochemical agents that impede pest and pathogen attack. Nearly 40 years ago, pathogen-inducible diterpenoid production was described in rice, and these compounds were shown to function as antimicrobial phytoalexins. Using rice and maize as examples, we discuss recent advances in the discovery, biosynthesis, elicitation and functional characterization of monocot terpenoid phytoalexins. The recent expansion of known terpenoid phytoalexins now includes not only the labdane-related diterpenoid superfamily but also casbane-type diterpenoids and β-macrocarpene-derived sequiterpenoids. Biochemical approaches have been used to pair pathway precursors and end products with cognate biosynthetic genes. The number of predicted terpenoid phytoalexins is expanding through advances in cereal genome annotation and terpene synthase characterization that likewise enable discoveries outside the Poaceae. At the cellular level, conclusive evidence now exists for multiple plant receptors of fungal-derived chitin elicitors, phosphorylation of membrane-associated signaling complexes, activation of mitogen-activated protein kinase, involvement of phytohormone signals, and the existence of transcription factors that mediate the expression of phytoalexin biosynthetic genes and subsequent accumulation of pathway end products. Elicited production of terpenoid phytoalexins exhibit additional biological functions, including root exudate-mediated allelopathy and insect antifeedant activity. Such findings have encouraged consideration of additional interactions that blur traditionally discrete phytoalexin classifications. The establishment of mutant collections and increasing ease of genetic transformation assists critical examination of further biological roles. Future research directions include examination of terpenoid phytoalexin precursors and end products as potential signals mediating plant physiological processes.
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Affiliation(s)
- Eric A Schmelz
- Center for Medical, Agricultural, and Veterinary Entomology, US Department of Agriculture, Agricultural Research Service, Chemistry Research Unit, Gainesville, FL, 32608, USA
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49
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Zipfel C. Plant pattern-recognition receptors. Trends Immunol 2014; 35:345-51. [DOI: 10.1016/j.it.2014.05.004] [Citation(s) in RCA: 645] [Impact Index Per Article: 64.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Revised: 05/17/2014] [Accepted: 05/21/2014] [Indexed: 12/18/2022]
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50
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Pagliai FA, Gardner CL, Bojilova L, Sarnegrim A, Tamayo C, Potts AH, Teplitski M, Folimonova SY, Gonzalez CF, Lorca GL. The transcriptional activator LdtR from 'Candidatus Liberibacter asiaticus' mediates osmotic stress tolerance. PLoS Pathog 2014; 10:e1004101. [PMID: 24763829 PMCID: PMC3999280 DOI: 10.1371/journal.ppat.1004101] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2013] [Accepted: 03/18/2014] [Indexed: 02/02/2023] Open
Abstract
The causal agent of Huanglongbing disease, ‘Candidatus Liberibacter asiaticus’, is a non-culturable, gram negative, phloem-limited α-proteobacterium. Current methods to control the spread of this disease are still limited to the removal and destruction of infected trees. In this study, we identified and characterized a regulon from ‘Ca. L. asiaticus’ involved in cell wall remodeling, that contains a member of the MarR family of transcriptional regulators (ldtR), and a predicted L,D-transpeptidase (ldtP). In Sinorhizobium meliloti, mutation of ldtR resulted in morphological changes (shortened rod-type phenotype) and reduced tolerance to osmotic stress. A biochemical approach was taken to identify small molecules that modulate LdtR activity. The LdtR ligands identified by thermal shift assays were validated using DNA binding methods. The biological impact of LdtR inactivation by the small molecules was then examined in Sinorhizobium meliloti and Liberibacter crescens, where a shortened-rod phenotype was induced by growth in presence of the ligands. A new method was also developed to examine the effects of small molecules on the viability of ‘Ca. Liberibacter asiaticus’, using shoots from HLB-infected orange trees. Decreased expression of ldtRLas and ldtPLas was observed in samples taken from HLB-infected shoots after 6 h of incubation with the LdtR ligands. These results provide strong proof of concept for the use of small molecules that target LdtR, as a potential treatment option for Huanglongbing disease. The rapid expansion of Huanglongbing disease (HLB) has caused a severe crisis in the citrus industry, with no solution visible in the near future. The causative agent, ‘Candidatus Liberibacter asiaticus’, is an unculturable bacterium under common laboratory conditions, which has made it difficult to gain understanding of this pathogen. Here we used a biochemical approach to identify new chemicals that could be used for the treatment of this devastating disease. These chemicals target a specific transcription factor (LdtR) in ‘Ca. Liberibacter asiaticus’. When bound to LdtR, the chemicals inactivate the protein, which disrupts a cell wall remodeling process that is critical for survival of the pathogen when exposed to osmotic stress (i.e. within the phloem of a citrus tree). Several model strains were used to confirm that the newly identified transcription factor (LdtR) and its regulated genes (ldtR and ldtP) confer tolerance to osmotic stress. The results presented in this study provide strong proof of concept for the use of small molecules that target LdtR, as a potential treatment option for Huanglongbing disease.
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Affiliation(s)
- Fernando A. Pagliai
- Microbiology and Cell Science Department, Genetics Institute, Institute of Food and Agricultural Science, University of Florida, Gainesville, Florida, United States of America
| | - Christopher L. Gardner
- Microbiology and Cell Science Department, Genetics Institute, Institute of Food and Agricultural Science, University of Florida, Gainesville, Florida, United States of America
| | - Lora Bojilova
- Microbiology and Cell Science Department, Genetics Institute, Institute of Food and Agricultural Science, University of Florida, Gainesville, Florida, United States of America
| | - Amanda Sarnegrim
- Microbiology and Cell Science Department, Genetics Institute, Institute of Food and Agricultural Science, University of Florida, Gainesville, Florida, United States of America
| | - Cheila Tamayo
- Microbiology and Cell Science Department, Genetics Institute, Institute of Food and Agricultural Science, University of Florida, Gainesville, Florida, United States of America
| | - Anastasia H. Potts
- Microbiology and Cell Science Department, Genetics Institute, Institute of Food and Agricultural Science, University of Florida, Gainesville, Florida, United States of America
| | - Max Teplitski
- Microbiology and Cell Science Department, Genetics Institute, Institute of Food and Agricultural Science, University of Florida, Gainesville, Florida, United States of America
- Soil and Water Science Department, Genetics Institute, Institute of Food and Agricultural Science, University of Florida, Gainesville, Florida, United States of America
| | - Svetlana Y. Folimonova
- Department of Plant Pathology, Genetics Institute, Institute of Food and Agricultural Science, University of Florida, Gainesville, Florida, United States of America
| | - Claudio F. Gonzalez
- Microbiology and Cell Science Department, Genetics Institute, Institute of Food and Agricultural Science, University of Florida, Gainesville, Florida, United States of America
- * E-mail: (CFG); (GLL)
| | - Graciela L. Lorca
- Microbiology and Cell Science Department, Genetics Institute, Institute of Food and Agricultural Science, University of Florida, Gainesville, Florida, United States of America
- * E-mail: (CFG); (GLL)
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