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Monnens TQ, Roux B, Cunnac S, Charbit E, Carrère S, Lauber E, Jardinaud MF, Darrasse A, Arlat M, Szurek B, Pruvost O, Jacques MA, Gagnevin L, Koebnik R, Noël LD, Boulanger A. Comparative transcriptomics reveals a highly polymorphic Xanthomonas HrpG virulence regulon. BMC Genomics 2024; 25:777. [PMID: 39123115 PMCID: PMC11316434 DOI: 10.1186/s12864-024-10684-6] [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: 05/21/2024] [Accepted: 08/02/2024] [Indexed: 08/12/2024] Open
Abstract
BACKGROUND Bacteria of the genus Xanthomonas cause economically significant diseases in various crops. Their virulence is dependent on the translocation of type III effectors (T3Es) into plant cells by the type III secretion system (T3SS), a process regulated by the master response regulator HrpG. Although HrpG has been studied for over two decades, its regulon across diverse Xanthomonas species, particularly beyond type III secretion, remains understudied. RESULTS In this study, we conducted transcriptome sequencing to explore the HrpG regulons of 17 Xanthomonas strains, encompassing six species and nine pathovars, each exhibiting distinct host and tissue specificities. We employed constitutive expression of plasmid-borne hrpG*, which encodes a constitutively active form of HrpG, to induce the regulon. Our findings reveal substantial inter- and intra-specific diversity in the HrpG* regulons across the strains. Besides 21 genes directly involved in the biosynthesis of the T3SS, the core HrpG* regulon is limited to only five additional genes encoding the transcriptional activator HrpX, the two T3E proteins XopR and XopL, a major facility superfamily (MFS) transporter, and the phosphatase PhoC. Interestingly, genes involved in chemotaxis and genes encoding enzymes with carbohydrate-active and proteolytic activities are variably regulated by HrpG*. CONCLUSIONS The diversity in the HrpG* regulon suggests that HrpG-dependent virulence in Xanthomonas might be achieved through several distinct strain-specific strategies, potentially reflecting adaptation to diverse ecological niches. These findings enhance our understanding of the complex role of HrpG in regulating various virulence and adaptive pathways, extending beyond T3Es and the T3SS.
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Affiliation(s)
- Thomas Quiroz Monnens
- LIPME, INRAE/CNRS UMR 0441/2594, Université de Toulouse, Université Paul Sabatier Toulouse 3, UMR, Castanet-Tolosan, 31320, France
| | - Brice Roux
- LIPME, INRAE/CNRS UMR 0441/2594, Université de Toulouse, Université Paul Sabatier Toulouse 3, UMR, Castanet-Tolosan, 31320, France
| | - Sébastien Cunnac
- PHIM, Université de Montpellier, IRD, CIRAD, INRAE, Institut Agro, Montpellier, France
| | - Erika Charbit
- Univ. Angers, Institut Agro, INRAE, IRHS, SFR QUASAV, Angers, F-49000, France
| | - Sébastien Carrère
- LIPME, INRAE/CNRS UMR 0441/2594, Université de Toulouse, Université Paul Sabatier Toulouse 3, UMR, Castanet-Tolosan, 31320, France
| | - Emmanuelle Lauber
- LIPME, INRAE/CNRS UMR 0441/2594, Université de Toulouse, Université Paul Sabatier Toulouse 3, UMR, Castanet-Tolosan, 31320, France
| | - Marie-Françoise Jardinaud
- LIPME, INRAE/CNRS UMR 0441/2594, Université de Toulouse, Université Paul Sabatier Toulouse 3, UMR, Castanet-Tolosan, 31320, France
| | - Armelle Darrasse
- Univ. Angers, Institut Agro, INRAE, IRHS, SFR QUASAV, Angers, F-49000, France
| | - Matthieu Arlat
- LIPME, INRAE/CNRS UMR 0441/2594, Université de Toulouse, Université Paul Sabatier Toulouse 3, UMR, Castanet-Tolosan, 31320, France
| | - Boris Szurek
- PHIM, Université de Montpellier, IRD, CIRAD, INRAE, Institut Agro, Montpellier, France
| | | | - Marie-Agnès Jacques
- Univ. Angers, Institut Agro, INRAE, IRHS, SFR QUASAV, Angers, F-49000, France
| | - Lionel Gagnevin
- CIRAD, UMR PVBMT, Saint-Pierre, La Réunion, F-97410, France
- PHIM, Université de Montpellier, IRD, CIRAD, INRAE, Institut Agro, Montpellier, France
- CIRAD, UMR PHIM, Montpellier, F-34398, France
| | - Ralf Koebnik
- PHIM, Université de Montpellier, IRD, CIRAD, INRAE, Institut Agro, Montpellier, France
| | - Laurent D Noël
- LIPME, INRAE/CNRS UMR 0441/2594, Université de Toulouse, Université Paul Sabatier Toulouse 3, UMR, Castanet-Tolosan, 31320, France.
| | - Alice Boulanger
- LIPME, INRAE/CNRS UMR 0441/2594, Université de Toulouse, Université Paul Sabatier Toulouse 3, UMR, Castanet-Tolosan, 31320, France.
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2
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Rosenberg T, Jiménez-Guerrero I, Tamir-Ariel D, Yarnitzky T, Burdman S. The GDSL-Lipolytic Enzyme Lip1 Is Required for Full Virulence of the Cucurbit Pathogenic Bacterium Acidovorax citrulli. Microorganisms 2022; 10:microorganisms10051016. [PMID: 35630458 PMCID: PMC9147443 DOI: 10.3390/microorganisms10051016] [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: 04/19/2022] [Revised: 05/04/2022] [Accepted: 05/09/2022] [Indexed: 02/01/2023] Open
Abstract
Bacterial fruit blotch caused by Acidovoraxcitrulli is a serious disease of cucurbit crops. Here we report characterization of a mutant strain of A. citrulli M6 defective in lip1, a gene encoding a lipolytic enzyme. The M6-lip1- mutant was detected in a mutant library screen aimed at identifying M6 mutants with altered levels of twitching motility. In this screen M6-lip1- was the only mutant that showed significantly larger twitching motility haloes around colonies than wild-type M6. Sequence analyses indicated that lip1 encodes a member of the GDSL family of secreted lipolytic enzymes. In line with this finding, lipolytic assays showed that the supernatants of M6-lip1- had lower lipolytic activity as compared with those of wild-type M6 and a lip1-complemented strain. The mutant was also affected in swimming motility and had compromised virulence on melon seedlings and on Nicotiana benthamiana leaves relative to wild-type and complemented strains. Lip1 contains a predicted N-terminal signal sequence for type II secretion. Evidence from our study confirms Lip1 is indeed secreted in a type II secretion-dependent manner, and this is required for full virulence of A. citrulli. To the best of our knowledge this is the first study reporting contribution of lipolytic activity to virulence of a plant-pathogenic Acidovorax species.
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Affiliation(s)
- Tally Rosenberg
- Department of Plant Pathology and Microbiology, Institute of Environmental Sciences, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 7610001, Israel; (T.R.); (I.J.-G.); (D.T.-A.); (T.Y.)
| | - Irene Jiménez-Guerrero
- Department of Plant Pathology and Microbiology, Institute of Environmental Sciences, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 7610001, Israel; (T.R.); (I.J.-G.); (D.T.-A.); (T.Y.)
- Departamento de Microbiología, Facultad de Biología, Universidad de Sevilla, 41012 Sevilla, Spain
| | - Dafna Tamir-Ariel
- Department of Plant Pathology and Microbiology, Institute of Environmental Sciences, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 7610001, Israel; (T.R.); (I.J.-G.); (D.T.-A.); (T.Y.)
| | - Tali Yarnitzky
- Department of Plant Pathology and Microbiology, Institute of Environmental Sciences, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 7610001, Israel; (T.R.); (I.J.-G.); (D.T.-A.); (T.Y.)
| | - Saul Burdman
- Department of Plant Pathology and Microbiology, Institute of Environmental Sciences, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 7610001, Israel; (T.R.); (I.J.-G.); (D.T.-A.); (T.Y.)
- Correspondence: ; Tel.: +972-8-9489369
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3
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Ivo Ganchev. Role of Multispecies Biofilms with a Dominance of Bacillus subtilis in the Rhizosphere. BIOL BULL+ 2022. [DOI: 10.1134/s1062359021150061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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4
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Court EK, Chaudhuri RR, Kapoore RV, Villa RX, Pandhal J, Biggs CA, Stafford GP. Looking through the FOG: microbiome characterization and lipolytic bacteria isolation from a fatberg site. MICROBIOLOGY (READING, ENGLAND) 2021; 167. [PMID: 34870579 PMCID: PMC8744997 DOI: 10.1099/mic.0.001117] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Sewer systems are complex physical, chemical and microbial ecosystems where fats, oils and grease (FOG) present a major problem for sewer management. Their accumulation can lead to blockages (‘Fatbergs’), sewer overflows and disruption of downstream wastewater treatment. Further advancements of biological FOG treatments need to be tailored to degrade the FOG, and operate successfully within the sewer environment. In this study we developed a pipeline for isolation of lipolytic strains directly from two FOG blockage sites in the UK, and isolated a range of highly lipolytic bacteria. We selected the five most lipolytic strains using Rhodamine B agar plates and pNP-Fatty acid substrates, with two Serratia spp., two Klebsiella spp. and an environmental Acinetobacter strain that all have the capacity to grow on FOG-based carbon sources. Their genome sequences identified the genetic capacity for fatty acid harvesting (lipases), catabolism and utilization (Fad genes). Furthermore, we performed a preliminary molecular characterization of the microbial community at these sites, showing a diverse community of environmental bacteria at each site, but which did include evidence of sequences related to our isolates. This study provides proof of concept to isolation strategies targeting Fatberg sites to yield candidate strains with bioremediation potential for FOG in the wastewater network. Our work sets the foundation for development of novel bioadditions tailored to the environment with non-pathogenic Acinetobacter identified as a candidate for this purpose.
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Affiliation(s)
- Elizabeth K Court
- Integrated BioScience Group, School of Clinical Dentistry, University of Sheffield, Sheffield, UK.,Department of Civil and Structural Engineering, University of Sheffield, Sheffield, UK
| | - Roy R Chaudhuri
- Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield, UK
| | - Rahul V Kapoore
- Department of Chemical and Biological Engineering, University of Sheffield, Sheffield, UK.,Department of Biosciences, College of Science, Swansea University, Swansea, UK
| | - Raffaella X Villa
- Department of Engineering and Sustainable Development, De Montfort University, Leicester, UK
| | - Jagroop Pandhal
- Department of Chemical and Biological Engineering, University of Sheffield, Sheffield, UK
| | - Catherine A Biggs
- Environmental Engineering Group, School of Engineering, Newcastle University, Newcastle, UK
| | - Graham P Stafford
- Integrated BioScience Group, School of Clinical Dentistry, University of Sheffield, Sheffield, UK.,Department of Civil and Structural Engineering, University of Sheffield, Sheffield, UK
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5
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The HrpG/HrpX Regulon of Xanthomonads-An Insight to the Complexity of Regulation of Virulence Traits in Phytopathogenic Bacteria. Microorganisms 2021; 9:microorganisms9010187. [PMID: 33467109 PMCID: PMC7831014 DOI: 10.3390/microorganisms9010187] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 01/11/2021] [Accepted: 01/13/2021] [Indexed: 12/05/2022] Open
Abstract
Bacteria of the genus Xanthomonas cause a wide variety of economically important diseases in most crops. The virulence of the majority of Xanthomonas spp. is dependent on secretion and translocation of effectors by the type 3 secretion system (T3SS) that is controlled by two master transcriptional regulators HrpG and HrpX. Since their discovery in the 1990s, the two regulators were the focal point of many studies aiming to decipher the regulatory network that controls pathogenicity in Xanthomonas bacteria. HrpG controls the expression of HrpX, which subsequently controls the expression of T3SS apparatus genes and effectors. The HrpG/HrpX regulon is activated in planta and subjected to tight metabolic and genetic regulation. In this review, we cover the advances made in understanding the regulatory networks that control and are controlled by the HrpG/HrpX regulon and their conservation between different Xanthomonas spp.
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6
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Assis RDAB, Polloni LC, Patané JSL, Thakur S, Felestrino ÉB, Diaz-Caballero J, Digiampietri LA, Goulart LR, Almeida NF, Nascimento R, Dandekar AM, Zaini PA, Setubal JC, Guttman DS, Moreira LM. Identification and analysis of seven effector protein families with different adaptive and evolutionary histories in plant-associated members of the Xanthomonadaceae. Sci Rep 2017; 7:16133. [PMID: 29170530 PMCID: PMC5700972 DOI: 10.1038/s41598-017-16325-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2017] [Accepted: 11/09/2017] [Indexed: 02/07/2023] Open
Abstract
The Xanthomonadaceae family consists of species of non-pathogenic and pathogenic γ-proteobacteria that infect different hosts, including humans and plants. In this study, we performed a comparative analysis using 69 fully sequenced genomes belonging to this family, with a focus on identifying proteins enriched in phytopathogens that could explain the lifestyle and the ability to infect plants. Using a computational approach, we identified seven phytopathogen-enriched protein families putatively secreted by type II secretory system: PheA (CM-sec), LipA/LesA, VirK, and four families involved in N-glycan degradation, NixE, NixF, NixL, and FucA1. In silico and phylogenetic analyses of these protein families revealed they all have orthologs in other phytopathogenic or symbiotic bacteria, and are involved in the modulation and evasion of the immune system. As a proof of concept, we performed a biochemical characterization of LipA from Xac306 and verified that the mutant strain lost most of its lipase and esterase activities and displayed reduced virulence in citrus. Since this study includes closely related organisms with distinct lifestyles and highlights proteins directly related to adaptation inside plant tissues, novel approaches might use these proteins as biotechnological targets for disease control, and contribute to our understanding of the coevolution of plant-associated bacteria.
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Affiliation(s)
- Renata de A B Assis
- Center of Research in Biological Science, Federal University of Ouro Preto, Ouro Preto, MG, Brazil
| | | | - José S L Patané
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, SP, Brazil
| | - Shalabh Thakur
- Department of Cell & Systems Biology, University of Toronto, 25 Willcocks St., Toronto, Ontario, M5S 3B2, Canada
| | - Érica B Felestrino
- Center of Research in Biological Science, Federal University of Ouro Preto, Ouro Preto, MG, Brazil
| | - Julio Diaz-Caballero
- Department of Cell & Systems Biology, University of Toronto, 25 Willcocks St., Toronto, Ontario, M5S 3B2, Canada
| | | | - Luiz Ricardo Goulart
- Institute of Genetics and Biochemistry, Federal University of Uberlândia, Uberlândia, MG, Brazil
| | - Nalvo F Almeida
- School of Computing, Federal University of Mato Grosso do Sul, Mato Grosso do Sul, MS, Brazil
| | - Rafael Nascimento
- Institute of Genetics and Biochemistry, Federal University of Uberlândia, Uberlândia, MG, Brazil
| | - Abhaya M Dandekar
- Department of Plant Sciences, University of California, Davis, CA, USA
| | - Paulo A Zaini
- Institute of Genetics and Biochemistry, Federal University of Uberlândia, Uberlândia, MG, Brazil.,Department of Plant Sciences, University of California, Davis, CA, USA
| | - João C Setubal
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, SP, Brazil
| | - David S Guttman
- Department of Cell & Systems Biology, University of Toronto, 25 Willcocks St., Toronto, Ontario, M5S 3B2, Canada.,Centre for the Analysis of Genome Evolution and Function, University of Toronto, 25 Willcocks St., Toronto, Ontario, M5S 3B2, Canada
| | - Leandro Marcio Moreira
- Center of Research in Biological Science, Federal University of Ouro Preto, Ouro Preto, MG, Brazil. .,Department of Biological Science, Institute of Exact and Biological Science, Federal University of Ouro Preto, Ouro Preto, MG, Brazil.
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7
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Wu G, Su P, Wang B, Zhang Y, Qian G, Liu F. Novel Insights into Tat Pathway in Xanthomonas oryzae pv. oryzae Stress Adaption and Virulence: Identification and Characterization of Tat-Dependent Translocation Proteins. PHYTOPATHOLOGY 2017; 107:1011-1021. [PMID: 28699375 DOI: 10.1094/phyto-02-17-0053-r] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Xanthomonas oryzae pv. oryzae, an economically important bacterium, causes a serious disease in rice production worldwide called bacterial leaf blight. How X. oryzae pv. oryzae infects rice and causes symptoms remains incompletely understood. Our earlier works demonstrated that the twin-arginine translocation (Tat) pathway plays an vital role in X. oryzae pv. oryzae fitness and virulence but the underlying mechanism is unknown. In this study, we used strain PXO99A as a working model, and identified 15 potential Tat-dependent translocation proteins (TDTP) by using comparative proteomics and bioinformatics analyses. Combining systematic mutagenesis, phenotypic characterization, and gene expression, we found that multiple TDTP play key roles in X. oryzae pv. oryzae adaption or virulence. In particular, four TDTP (PXO_02203, PXO_03477, PXO_02523, and PXO_02951) were involved in virulence, three TDTP (PXO_02203, PXO_03477, and PXO_02523) contributed to colonization in planta, one TDTP (PXO_02671) had a key role in attachment to leaf surface, four TDTP (PXO_02523, PXO_02951, PXO_03132, and PXO_03841) were involved in tolerance to multiple stresses, and two TDTP (PXO_02523 and PXO_02671) were required for full swarming motility. These findings suggest that multiple TDTP may have differential contributions to involvement of the Tat pathway in X. oryzae pv. oryzae adaption, physiology, and pathogenicity.
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Affiliation(s)
- Guichun Wu
- All authors: Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China/Key Laboratory of Integrated Management of Crop Diseases and Pests (Nanjing Agricultural University), Ministry of Education, P.R. China; and sixth author: Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, P.R. China
| | - Panpan Su
- All authors: Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China/Key Laboratory of Integrated Management of Crop Diseases and Pests (Nanjing Agricultural University), Ministry of Education, P.R. China; and sixth author: Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, P.R. China
| | - Bo Wang
- All authors: Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China/Key Laboratory of Integrated Management of Crop Diseases and Pests (Nanjing Agricultural University), Ministry of Education, P.R. China; and sixth author: Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, P.R. China
| | - Yuqiang Zhang
- All authors: Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China/Key Laboratory of Integrated Management of Crop Diseases and Pests (Nanjing Agricultural University), Ministry of Education, P.R. China; and sixth author: Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, P.R. China
| | - Guoliang Qian
- All authors: Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China/Key Laboratory of Integrated Management of Crop Diseases and Pests (Nanjing Agricultural University), Ministry of Education, P.R. China; and sixth author: Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, P.R. China
| | - Fengquan Liu
- All authors: Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China/Key Laboratory of Integrated Management of Crop Diseases and Pests (Nanjing Agricultural University), Ministry of Education, P.R. China; and sixth author: Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, P.R. China
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8
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Chen F, Cui G, Wang S, Nair MKM, He L, Qi X, Han X, Zhang H, Zhang JR, Su J. Outer membrane vesicle-associated lipase FtlA enhances cellular invasion and virulence in Francisella tularensis LVS. Emerg Microbes Infect 2017; 6:e66. [PMID: 28745311 PMCID: PMC5567169 DOI: 10.1038/emi.2017.53] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Revised: 05/16/2017] [Accepted: 05/22/2017] [Indexed: 01/10/2023]
Abstract
Francisella tularensis is a highly infectious intracellular pathogen that infects a wide range of host species and causes fatal pneumonic tularemia in humans. ftlA was identified as a potential virulence determinant of the F. tularensis live vaccine strain (LVS) in our previous transposon screen, but its function remained undefined. Here, we show that an unmarked deletion mutant of ftlA was avirulent in a pneumonia mouse model with a severely impaired capacity to infect host cells. Consistent with its sequence homology with GDSL lipase/esterase family proteins, the FtlA protein displayed lipolytic activity in both E. coli and F. tularensis with a preference for relatively short carbon-chain substrates. FtlA thus represents the first F. tularensis lipase to promote bacterial infection of host cells and in vivo fitness. As a cytoplasmic protein, we found that FtlA was secreted into the extracellular environment as a component of outer membrane vesicles (OMVs). Further confocal microscopy analysis revealed that the FtlA-containing OMVs isolated from F. tularensis LVS attached to the host cell membrane. Finally, the OMV-associated FtlA protein complemented the genetic deficiency of the ΔftlA mutant in terms of host cell infection when OMVs purified from the parent strain were co-incubated with the mutant bacteria. These lines of evidence strongly suggest that the FtlA lipase promotes F. tularensis adhesion and internalization by modifying bacterial and/or host molecule(s) when it is secreted as a component of OMVs.
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Affiliation(s)
- Fei Chen
- Key Laboratory of Animal Epidemiology and Zoonosis, Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Guolin Cui
- Key Laboratory of Animal Epidemiology and Zoonosis, Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Shuxia Wang
- Key Laboratory of Animal Epidemiology and Zoonosis, Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | | | - Lihong He
- Center for Infectious Disease Research, School of Medicine, Tsinghua University, Beijing 100084, China
| | - Xinyi Qi
- Key Laboratory of Animal Epidemiology and Zoonosis, Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Xiangmin Han
- Key Laboratory of Animal Epidemiology and Zoonosis, Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Hanqi Zhang
- Key Laboratory of Animal Epidemiology and Zoonosis, Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Jing-Ren Zhang
- Center for Infectious Disease Research, School of Medicine, Tsinghua University, Beijing 100084, China
| | - Jingliang Su
- Key Laboratory of Animal Epidemiology and Zoonosis, Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
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Patel HK, Ferrante P, Xianfa M, Javvadi SG, Subramoni S, Scortichini M, Venturi V. Identification of Loci of Pseudomonas syringae pv. actinidiae Involved in Lipolytic Activity and Their Role in Colonization of Kiwifruit Leaves. PHYTOPATHOLOGY 2017; 107:645-653. [PMID: 28112597 DOI: 10.1094/phyto-10-16-0360-r] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Bacterial canker disease caused by Pseudomonas syringae pv. actinidiae, an emerging pathogen of kiwifruit plants, has recently brought about major economic losses worldwide. Genetic studies on virulence functions of P. syringae pv. actinidiae have not yet been reported and there is little experimental data regarding bacterial genes involved in pathogenesis. In this study, we performed a genetic screen in order to identify transposon mutants altered in the lipolytic activity because it is known that mechanisms of regulation, production, and secretion of enzymes often play crucial roles in virulence of plant pathogens. We aimed to identify the set of secretion and global regulatory loci that control lipolytic activity and also play important roles in in planta fitness. Our screen for altered lipolytic activity phenotype identified a total of 58 Tn5 transposon mutants. Mapping all these Tn5 mutants revealed that the transposons were inserted in genes that play roles in cell division, chemotaxis, metabolism, movement, recombination, regulation, signal transduction, and transport as well as a few unknown functions. Several of these identified P. syringae pv. actinidiae Tn5 mutants, notably the functions affected in phosphomannomutase AlgC, lipid A biosynthesis acyltransferase, glutamate-cysteine ligase, and the type IV pilus protein PilI, were also found affected in in planta survival and/or growth in kiwifruit plants. The results of the genetic screen and identification of novel loci involved in in planta fitness of P. syringae pv. actinidiae are presented and discussed.
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Affiliation(s)
- Hitendra Kumar Patel
- First, third, fourth, fifth, and seventh authors: International Centre for Genetic Engineering and Biotechnology, Trieste, Italy; second and sixth authors: Research Centre for Fruit Crops, Agricultural Research Council, Roma, Italy; and sixth author: Research Unit for Fruit Trees, Council for Agricultural Research and Economics, Caserta, Italy
| | - Patrizia Ferrante
- First, third, fourth, fifth, and seventh authors: International Centre for Genetic Engineering and Biotechnology, Trieste, Italy; second and sixth authors: Research Centre for Fruit Crops, Agricultural Research Council, Roma, Italy; and sixth author: Research Unit for Fruit Trees, Council for Agricultural Research and Economics, Caserta, Italy
| | - Meng Xianfa
- First, third, fourth, fifth, and seventh authors: International Centre for Genetic Engineering and Biotechnology, Trieste, Italy; second and sixth authors: Research Centre for Fruit Crops, Agricultural Research Council, Roma, Italy; and sixth author: Research Unit for Fruit Trees, Council for Agricultural Research and Economics, Caserta, Italy
| | - Sree Gowrinadh Javvadi
- First, third, fourth, fifth, and seventh authors: International Centre for Genetic Engineering and Biotechnology, Trieste, Italy; second and sixth authors: Research Centre for Fruit Crops, Agricultural Research Council, Roma, Italy; and sixth author: Research Unit for Fruit Trees, Council for Agricultural Research and Economics, Caserta, Italy
| | - Sujatha Subramoni
- First, third, fourth, fifth, and seventh authors: International Centre for Genetic Engineering and Biotechnology, Trieste, Italy; second and sixth authors: Research Centre for Fruit Crops, Agricultural Research Council, Roma, Italy; and sixth author: Research Unit for Fruit Trees, Council for Agricultural Research and Economics, Caserta, Italy
| | - Marco Scortichini
- First, third, fourth, fifth, and seventh authors: International Centre for Genetic Engineering and Biotechnology, Trieste, Italy; second and sixth authors: Research Centre for Fruit Crops, Agricultural Research Council, Roma, Italy; and sixth author: Research Unit for Fruit Trees, Council for Agricultural Research and Economics, Caserta, Italy
| | - Vittorio Venturi
- First, third, fourth, fifth, and seventh authors: International Centre for Genetic Engineering and Biotechnology, Trieste, Italy; second and sixth authors: Research Centre for Fruit Crops, Agricultural Research Council, Roma, Italy; and sixth author: Research Unit for Fruit Trees, Council for Agricultural Research and Economics, Caserta, Italy
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Pfeilmeier S, Caly DL, Malone JG. Bacterial pathogenesis of plants: future challenges from a microbial perspective: Challenges in Bacterial Molecular Plant Pathology. MOLECULAR PLANT PATHOLOGY 2016; 17:1298-313. [PMID: 27170435 PMCID: PMC6638335 DOI: 10.1111/mpp.12427] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2016] [Revised: 05/08/2016] [Accepted: 05/10/2016] [Indexed: 05/03/2023]
Abstract
Plant infection is a complicated process. On encountering a plant, pathogenic microorganisms must first adapt to life on the epiphytic surface, and survive long enough to initiate an infection. Responsiveness to the environment is critical throughout infection, with intracellular and community-level signal transduction pathways integrating environmental signals and triggering appropriate responses in the bacterial population. Ultimately, phytopathogens must migrate from the epiphytic surface into the plant tissue using motility and chemotaxis pathways. This migration is coupled with overcoming the physical and chemical barriers to entry into the plant apoplast. Once inside the plant, bacteria use an array of secretion systems to release phytotoxins and protein effectors that fulfil diverse pathogenic functions (Fig. ) (Melotto and Kunkel, ; Phan Tran et al., ). As our understanding of the pathways and mechanisms underpinning plant pathogenicity increases, a number of central research challenges are emerging that will profoundly shape the direction of research in the future. We need to understand the bacterial phenotypes that promote epiphytic survival and surface adaptation in pathogenic bacteria. How do these pathways function in the context of the plant-associated microbiome, and what impact does this complex microbial community have on the onset and severity of plant infections? The huge importance of bacterial signal transduction to every stage of plant infection is becoming increasingly clear. However, there is a great deal to learn about how these signalling pathways function in phytopathogenic bacteria, and the contribution they make to various aspects of plant pathogenicity. We are increasingly able to explore the structural and functional diversity of small-molecule natural products from plant pathogens. We need to acquire a much better understanding of the production, deployment, functional redundancy and physiological roles of these molecules. Type III secretion systems (T3SSs) are important and well-studied contributors to bacterial disease. Several key unanswered questions will shape future investigations of these systems. We need to define the mechanism of hierarchical and temporal control of effector secretion. For successful infection, effectors need to interact with host components to exert their function. Advanced biochemical, proteomic and cell biological techniques will enable us to study the function of effectors inside the host cell in more detail and on a broader scale. Population genomics analyses provide insight into evolutionary adaptation processes of phytopathogens. The determination of the diversity and distribution of type III effectors (T3Es) and other virulence genes within and across pathogenic species, pathovars and strains will allow us to understand how pathogens adapt to specific hosts, the evolutionary pathways available to them, and the possible future directions of the evolutionary arms race between effectors and molecular plant targets. Although pathogenic bacteria employ a host of different virulence and proliferation strategies, as a result of the space constraints, this review focuses mainly on the hemibiotrophic pathogens. We discuss the process of plant infection from the perspective of these important phytopathogens, and highlight new approaches to address the outstanding challenges in this important and fast-moving field.
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Affiliation(s)
- Sebastian Pfeilmeier
- The Sainsbury Laboratory, Norwich Research Park, Norwich, NR4 7UH, UK
- John Innes Centre, Norwich Research Park, Norwich, NR4 7UH, UK
| | - Delphine L Caly
- Université de Lille, EA 7394, ICV - Institut Charles Viollette, Lille, F-59000, France
| | - Jacob G Malone
- John Innes Centre, Norwich Research Park, Norwich, NR4 7UH, UK.
- University of East Anglia, Norwich, NR4 7TJ, UK.
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Nascimento R, Gouran H, Chakraborty S, Gillespie HW, Almeida-Souza HO, Tu A, Rao BJ, Feldstein PA, Bruening G, Goulart LR, Dandekar AM. The Type II Secreted Lipase/Esterase LesA is a Key Virulence Factor Required for Xylella fastidiosa Pathogenesis in Grapevines. Sci Rep 2016; 6:18598. [PMID: 26753904 PMCID: PMC4709584 DOI: 10.1038/srep18598] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Accepted: 11/03/2015] [Indexed: 11/09/2022] Open
Abstract
Pierce's disease (PD) of grapevines is caused by Xylella fastidiosa (Xf), a xylem-limited gamma-proteobacterium that is responsible for several economically important crop diseases. The occlusion of xylem elements and interference with water transport by Xf and its associated biofilm have been posited as the main cause of PD symptom development; however, Xf virulence mechanisms have not been described. Analysis of the Xf secretome revealed a putative lipase/esterase (LesA) that was abundantly secreted in bacterial culture supernatant and was characterized as a protein ortholog of the cell wall-degrading enzyme LipA of Xanthomonas strains. LesA was secreted by Xf and associated with a biofilm filamentous network. Additional proteomic analysis revealed its abundant presence in outer membrane vesicles (OMVs). Accumulation of LesA in leaf regions associated positively with PD symptoms and inversely with bacterial titer. The lipase/esterase also elicited a hypersensitive response in grapevine. Xf lesA mutants were significantly deficient for virulence when mechanically inoculated into grapevines. We propose that Xf pathogenesis is caused by LesA secretion mediated by OMV cargos and that its release and accumulation in leaf margins leads to early stages of observed PD symptoms.
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Affiliation(s)
- Rafael Nascimento
- Plant Sciences Department, University of California, Davis, 1 Shields Ave, Davis CA, 95616, USA.
- Institute of Genetics and Biochemistry, Federal University of Uberlândia, Av. Amazonas, Bloco 2E, Campus Umuarama, 38400-902, Uberlândia MG, Brazil
| | - Hossein Gouran
- Plant Sciences Department, University of California, Davis, 1 Shields Ave, Davis CA, 95616, USA.
| | - Sandeep Chakraborty
- Plant Sciences Department, University of California, Davis, 1 Shields Ave, Davis CA, 95616, USA.
| | - Hyrum W. Gillespie
- Plant Sciences Department, University of California, Davis, 1 Shields Ave, Davis CA, 95616, USA.
| | - Hebréia O. Almeida-Souza
- Institute of Genetics and Biochemistry, Federal University of Uberlândia, Av. Amazonas, Bloco 2E, Campus Umuarama, 38400-902, Uberlândia MG, Brazil
| | - Aye Tu
- Plant Sciences Department, University of California, Davis, 1 Shields Ave, Davis CA, 95616, USA.
| | - Basuthkar J. Rao
- Department of Biological Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India
| | - Paul A. Feldstein
- Plant Pathology Department, University of California, Davis, 1 Shields Ave, Davis CA, 95616, USA.
| | - George Bruening
- Plant Pathology Department, University of California, Davis, 1 Shields Ave, Davis CA, 95616, USA.
| | - Luiz R. Goulart
- Medical Microbiology and Immunology Department, University of California, Davis, 1 Shields Ave, Davis CA, 95616, USA
- Institute of Genetics and Biochemistry, Federal University of Uberlândia, Av. Amazonas, Bloco 2E, Campus Umuarama, 38400-902, Uberlândia MG, Brazil
| | - Abhaya M. Dandekar
- Plant Sciences Department, University of California, Davis, 1 Shields Ave, Davis CA, 95616, USA.
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Potnis N, Timilsina S, Strayer A, Shantharaj D, Barak JD, Paret ML, Vallad GE, Jones JB. Bacterial spot of tomato and pepper: diverse Xanthomonas species with a wide variety of virulence factors posing a worldwide challenge. MOLECULAR PLANT PATHOLOGY 2015; 16:907-20. [PMID: 25649754 PMCID: PMC6638463 DOI: 10.1111/mpp.12244] [Citation(s) in RCA: 108] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
TAXONOMIC STATUS Bacteria; Phylum Proteobacteria; Class Gammaproteobacteria; Order Xanthomonadales; Family Xanthomonadaceae; Genus Xanthomonas; Species Xanthomonas euvesicatoria, Xanthomonas vesicatoria, Xanthomonas perforans and Xanthomonas gardneri. MICROBIOLOGICAL PROPERTIES Gram-negative, rod-shaped bacterium, aerobic, motile, single polar flagellum. HOST RANGE Causes bacterial spot disease on plants belonging to the Solanaceae family, primarily tomato (Solanum lycopersicum), pepper (Capsicum annuum) and chilli peppers (Capsicum frutescens). DISEASE SYMPTOMS Necrotic lesions on all above-ground plant parts. DISTRIBUTION Worldwide distribution of X. euvesicatoria and X. vesicatoria on tomato and pepper; X. perforans and X. gardneri increasingly being isolated from the USA, Canada, South America, Africa and Europe. A wide diversity within the bacterial spot disease complex, with an ability to cause disease at different temperatures, makes this pathogen group a worldwide threat to tomato and pepper production. Recent advances in genome analyses have revealed the evolution of the pathogen with a plethora of novel virulence factors. Current management strategies rely on the use of various chemical control strategies and sanitary measures to minimize pathogen spread through contaminated seed. Chemical control strategies have been a challenge because of resistance by the pathogen. Breeding programmes have been successful in developing commercial lines with hypersensitive and quantitative resistance. However, durability of resistance has been elusive. Recently, a transgenic approach has resulted in the development of tomato genotypes with significant levels of resistance and improved yield that hold promise. In this article, we discuss the current taxonomic status, distribution of the four species, knowledge of virulence factors, detection methods and strategies for disease control with possible directions for future research.
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Affiliation(s)
- Neha Potnis
- Department of Plant Pathology, Fifield Hall, University of Florida, Gainesville, FL, 32611, USA
| | - Sujan Timilsina
- Department of Plant Pathology, Fifield Hall, University of Florida, Gainesville, FL, 32611, USA
| | - Amanda Strayer
- Department of Plant Pathology, Fifield Hall, University of Florida, Gainesville, FL, 32611, USA
| | - Deepak Shantharaj
- Department of Plant Pathology, Fifield Hall, University of Florida, Gainesville, FL, 32611, USA
| | - Jeri D Barak
- Department of Plant Pathology, Russell Laboratories, University of Wisconsin, Madison, WI, 53706, USA
| | - Mathews L Paret
- Gulf Coast Research and Education Center, University of Florida, Wimauma, FL, 33598, USA
| | - Gary E Vallad
- North Florida Research & Education Center, University of Florida, Quincy, FL, 32351-5677, USA
| | - Jeffrey B Jones
- Department of Plant Pathology, Fifield Hall, University of Florida, Gainesville, FL, 32611, USA
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Lee HH, Park J, Kim J, Park I, Seo YS. Understanding the direction of evolution in Burkholderia glumae through comparative genomics. Curr Genet 2015; 62:115-23. [DOI: 10.1007/s00294-015-0523-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Revised: 10/02/2015] [Accepted: 10/03/2015] [Indexed: 12/11/2022]
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Xanthomonas campestris pv. vesicatoria Secretes Proteases and Xylanases via the Xps Type II Secretion System and Outer Membrane Vesicles. J Bacteriol 2015; 197:2879-93. [PMID: 26124239 DOI: 10.1128/jb.00322-15] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Accepted: 06/19/2015] [Indexed: 11/20/2022] Open
Abstract
UNLABELLED Many plant-pathogenic bacteria utilize type II secretion (T2S) systems to secrete degradative enzymes into the extracellular milieu. T2S substrates presumably mediate the degradation of plant cell wall components during the host-pathogen interaction and thus promote bacterial virulence. Previously, the Xps-T2S system from Xanthomonas campestris pv. vesicatoria was shown to contribute to extracellular protease activity and the secretion of a virulence-associated xylanase. The identities and functions of additional T2S substrates from X. campestris pv. vesicatoria, however, are still unknown. In the present study, the analysis of 25 candidate proteins from X. campestris pv. vesicatoria led to the identification of two type II secreted predicted xylanases, a putative protease and a lipase which was previously identified as a virulence factor of X. campestris pv. vesicatoria. Studies with mutant strains revealed that the identified xylanases and the protease contribute to virulence and in planta growth of X. campestris pv. vesicatoria. When analyzed in the related pathogen X. campestris pv. campestris, several T2S substrates from X. campestris pv. vesicatoria were secreted independently of the T2S systems, presumably because of differences in the T2S substrate specificities of the two pathogens. Furthermore, in X. campestris pv. vesicatoria T2S mutants, secretion of T2S substrates was not completely absent, suggesting the contribution of additional transport systems to protein secretion. In line with this hypothesis, T2S substrates were detected in outer membrane vesicles, which were frequently observed for X. campestris pv. vesicatoria. We, therefore, propose that extracellular virulence-associated enzymes from X. campestris pv. vesicatoria are targeted to the Xps-T2S system and to outer membrane vesicles. IMPORTANCE The virulence of plant-pathogenic bacteria often depends on TS2 systems, which secrete degradative enzymes into the extracellular milieu. T2S substrates are being studied in several plant-pathogenic bacteria, including Xanthomonas campestris pv. vesicatoria, which causes bacterial spot disease in tomato and pepper. Here, we show that the T2S system from X. campestris pv. vesicatoria secretes virulence-associated xylanases, a predicted protease, and a lipase. Secretion assays with the related pathogen X. campestris pv. campestris revealed important differences in the T2S substrate specificities of the two pathogens. Furthermore, electron microscopy showed that T2S substrates from X. campestris pv. vesicatoria are targeted to outer membrane vesicles (OMVs). Our results, therefore, suggest that OMVs provide an alternative transport route for type II secreted extracellular enzymes.
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Blümke A, Falter C, Herrfurth C, Sode B, Bode R, Schäfer W, Feussner I, Voigt CA. Secreted fungal effector lipase releases free fatty acids to inhibit innate immunity-related callose formation during wheat head infection. PLANT PHYSIOLOGY 2014; 165:346-58. [PMID: 24686113 PMCID: PMC4012593 DOI: 10.1104/pp.114.236737] [Citation(s) in RCA: 83] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2014] [Accepted: 03/29/2014] [Indexed: 05/20/2023]
Abstract
The deposition of the (1,3)-β-glucan cell wall polymer callose at sites of attempted penetration is a common plant defense response to intruding pathogens and part of the plant's innate immunity. Infection of the Fusarium graminearum disruption mutant Δfgl1, which lacks the effector lipase FGL1, is restricted to inoculated wheat (Triticum aestivum) spikelets, whereas the wild-type strain colonized the whole wheat spike. Our studies here were aimed at analyzing the role of FGL1 in establishing full F. graminearum virulence. Confocal laser-scanning microscopy revealed that the Δfgl1 mutant strongly induced the deposition of spot-like callose patches in vascular bundles of directly inoculated spikelets, while these callose deposits were not observed in infections by the wild type. Elevated concentrations of the polyunsaturated free fatty acids (FFAs) linoleic and α-linolenic acid, which we detected in F. graminearum wild type-infected wheat spike tissue compared with Δfgl1-infected tissue, provided clear evidence for a suggested function of FGL1 in suppressing callose biosynthesis. These FFAs not only inhibited plant callose biosynthesis in vitro and in planta but also partially restored virulence to the Δfgl1 mutant when applied during infection of wheat spikelets. Additional FFA analysis confirmed that the purified effector lipase FGL1 was sufficient to release linoleic and α-linolenic acids from wheat spike tissue. We concluded that these two FFAs have a major function in the suppression of the innate immunity-related callose biosynthesis and, hence, the progress of F. graminearum wheat infection.
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Affiliation(s)
| | | | - Cornelia Herrfurth
- Molecular Phytopathology and Genetics, Biocenter Klein Flottbek, University of Hamburg, 22609 Hamburg, Germany (A.B., C.F., B.S., W.S., C.A.V.); and
- Department of Plant Biochemistry, Albrecht von Haller Institute for Plant Sciences, Georg August University, 37077 Goettingen, Germany (C.H., R.B., I.F.)
| | - Björn Sode
- Molecular Phytopathology and Genetics, Biocenter Klein Flottbek, University of Hamburg, 22609 Hamburg, Germany (A.B., C.F., B.S., W.S., C.A.V.); and
- Department of Plant Biochemistry, Albrecht von Haller Institute for Plant Sciences, Georg August University, 37077 Goettingen, Germany (C.H., R.B., I.F.)
| | - Rainer Bode
- Molecular Phytopathology and Genetics, Biocenter Klein Flottbek, University of Hamburg, 22609 Hamburg, Germany (A.B., C.F., B.S., W.S., C.A.V.); and
- Department of Plant Biochemistry, Albrecht von Haller Institute for Plant Sciences, Georg August University, 37077 Goettingen, Germany (C.H., R.B., I.F.)
| | - Wilhelm Schäfer
- Molecular Phytopathology and Genetics, Biocenter Klein Flottbek, University of Hamburg, 22609 Hamburg, Germany (A.B., C.F., B.S., W.S., C.A.V.); and
- Department of Plant Biochemistry, Albrecht von Haller Institute for Plant Sciences, Georg August University, 37077 Goettingen, Germany (C.H., R.B., I.F.)
| | - Ivo Feussner
- Molecular Phytopathology and Genetics, Biocenter Klein Flottbek, University of Hamburg, 22609 Hamburg, Germany (A.B., C.F., B.S., W.S., C.A.V.); and
- Department of Plant Biochemistry, Albrecht von Haller Institute for Plant Sciences, Georg August University, 37077 Goettingen, Germany (C.H., R.B., I.F.)
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Bogino PC, de las Mercedes Oliva M, Sorroche FG, Giordano W. The role of bacterial biofilms and surface components in plant-bacterial associations. Int J Mol Sci 2013; 14:15838-59. [PMID: 23903045 PMCID: PMC3759889 DOI: 10.3390/ijms140815838] [Citation(s) in RCA: 223] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2013] [Revised: 06/18/2013] [Accepted: 06/28/2013] [Indexed: 01/09/2023] Open
Abstract
The role of bacterial surface components in combination with bacterial functional signals in the process of biofilm formation has been increasingly studied in recent years. Plants support a diverse array of bacteria on or in their roots, transport vessels, stems, and leaves. These plant-associated bacteria have important effects on plant health and productivity. Biofilm formation on plants is associated with symbiotic and pathogenic responses, but how plants regulate such associations is unclear. Certain bacteria in biofilm matrices have been found to induce plant growth and to protect plants from phytopathogens (a process termed biocontrol), whereas others are involved in pathogenesis. In this review, we systematically describe the various components and mechanisms involved in bacterial biofilm formation and attachment to plant surfaces and the relationships of these mechanisms to bacterial activity and survival.
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Affiliation(s)
- Pablo C. Bogino
- Department of Molecular Biology, National University of Río Cuarto, Ruta 36 Km 601, Río Cuarto, Córdoba X5804BYA, Argentina; E-Mails: (P.C.B.); (F.G.S.)
| | - María de las Mercedes Oliva
- Department of Microbiology and Immunology, National University of Río Cuarto, Ruta 36 Km 601, Córdoba X5804BYA, Argentina; E-Mail:
| | - Fernando G. Sorroche
- Department of Molecular Biology, National University of Río Cuarto, Ruta 36 Km 601, Río Cuarto, Córdoba X5804BYA, Argentina; E-Mails: (P.C.B.); (F.G.S.)
| | - Walter Giordano
- Department of Molecular Biology, National University of Río Cuarto, Ruta 36 Km 601, Río Cuarto, Córdoba X5804BYA, Argentina; E-Mails: (P.C.B.); (F.G.S.)
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