201
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Ah Fong AMV, Judelson HS. The hAT -like DNA transposon DodoPi resides in a cluster of retro- and DNA transposons in the stramenopile Phytophthora infestans. Mol Genet Genomics 2004; 271:577-85. [PMID: 15098122 DOI: 10.1007/s00438-004-1004-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2003] [Accepted: 03/04/2004] [Indexed: 11/29/2022]
Abstract
A family of transposable elements belonging to the hAT group of DNA transposons is described from an oomycete, the plant pathogen Phytophthora infestans. The family, named DodoPi, was identified by studying a hotspot for retro- and DNA transposon insertions adjacent to the mating type locus. The DodoPi family comprises a small number of full-length copies, each of which is 2.7 kb long and predicted to encode a transposase-like protein consisting of 617 amino acids, and several truncated copies. Both types contain 12-bp terminal inverted repeats and are flanked by 8-bp target site duplications. Despite the detection of a DodoPi transcript and of many polymorphisms between isolates, conclusive evidence of recent transposition was not obtained. A phylogenetic analysis indicated that DodoPi was novel, with only modest similarity to some elements from plants and fungi. Relatives were detected in only some members of the genus. This is the first DNA transposon identified in the stramenopile group of eukaryotes.
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Affiliation(s)
- A M V Ah Fong
- Department of Plant Pathology, University of California, Riverside, CA 92521, USA
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202
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Tian M, Huitema E, Da Cunha L, Torto-Alalibo T, Kamoun S. A Kazal-like extracellular serine protease inhibitor from Phytophthora infestans targets the tomato pathogenesis-related protease P69B. J Biol Chem 2004; 279:26370-7. [PMID: 15096512 DOI: 10.1074/jbc.m400941200] [Citation(s) in RCA: 198] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The oomycetes form one of several lineages within the eukaryotes that independently evolved a parasitic lifestyle and consequently are thought to have developed alternative mechanisms of pathogenicity. The oomycete Phytophthora infestans causes late blight, a ravaging disease of potato and tomato. Little is known about processes associated with P. infestans pathogenesis, particularly the suppression of host defense responses. We describe and functionally characterize an extracellular protease inhibitor, EPI1, from P. infestans. EPI1 contains two domains with significant similarity to the Kazal family of serine protease inhibitors. Database searches suggested that Kazal-like proteins are mainly restricted to animals and apicomplexan parasites but appear to be widespread and diverse in the oomycetes. Recombinant EPI1 specifically inhibited subtilisin A among major serine proteases and inhibited and interacted with the pathogenesis-related P69B subtilisin-like serine protease of tomato in intercellular fluids. The epi1 and P69B genes were coordinately expressed and up-regulated during infection of tomato by P. infestans. Inhibition of tomato proteases by EPI1 could form a novel type of defense-counterdefense mechanism between plants and microbial pathogens. In addition, this study points to a common virulence strategy between the oomycete plant pathogen P. infestans and several mammalian parasites, such as the apicomplexan Toxoplasma gondii.
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Affiliation(s)
- Miaoying Tian
- Department of Plant Pathology, The Ohio State University, Ohio Agricultural Research and Development Center, Wooster, Ohio 44691, USA
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203
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Shan W, Hardham AR. Construction of a bacterial artificial chromosome library, determination of genome size, and characterization of an Hsp70 gene family in Phytophthora nicotianae. Fungal Genet Biol 2004; 41:369-80. [PMID: 14761797 DOI: 10.1016/j.fgb.2003.11.012] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2003] [Accepted: 11/14/2003] [Indexed: 11/25/2022]
Abstract
The oomycete plant pathogen Phytophthora nicotianae causes diseases on a wide range of plant species. To facilitate isolation and functional characterization of pathogenicity genes, we have constructed a large-insert bacterial artificial chromosome (BAC) library using nuclear DNA from P. nicotianae H1111. The library contains 10,752 clones with an average insert size of 90 kb and is free of mitochondrial DNA. The quality of the library was verified by hybridization with 37 genes, all of which resulted in the identification of multiple positive clones. The library is estimated to be 10.6 haploid genome equivalents based on hybridization of 23 single-copy genes and the genome size of P. nicotianae was estimated to be 95.5 Mb. Hybridization with a nuclear repetitive DNA probe revealed that 4.4% of clones in the library contained 28S rDNA. Hybridization of total genomic DNA to the library indicated that at least 39% of the BAC library contains repetitive DNA sequences. A BAC pooling strategy was developed for efficient library screening. The library was used to identify and characterize BAC clones containing an Hsp70 gene family whose four members were identified to be clustered within approximately 18 kb in the P. nicotianae genome based on the physical mapping of eight BACs spanning a genomic region of approximately 186 kb. The BAC library created provides an invaluable resource for the isolation of P. nicotianae genes and for comparative genomics studies.
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Affiliation(s)
- Weixing Shan
- Plant Cell Biology Group, Research School of Biological Sciences, The Australian National University, Canberra, ACT 2601, Australia
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204
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Talbot NJ. Let there be blight: functional analysis of virulence in Phytophthora infestans. Mol Microbiol 2004; 51:913-5. [PMID: 14763968 DOI: 10.1046/j.1365-2958.2003.03878.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- Nicholas J Talbot
- School of Biological and Chemical Sciences, University of Exeter, Washington Singer Laboratories, Perry Road, Exeter EX4 4QG, UK.
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205
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Brunt SA, Silver JC. Molecular cloning and characterization of two different cDNAs encoding the molecular chaperone Hsp90 in the Oomycete Achlya ambisexualis. Fungal Genet Biol 2004; 41:239-52. [PMID: 14732269 DOI: 10.1016/j.fgb.2003.08.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The chaperone Hsp90 plays a key role in the maturation and activation of many 'client' proteins in eukaryotic cells. In the oomycete Achlya ambisexualis two populations of hsp90 transcripts that differ slightly in size (2.8 and 2.9 kb) are present in heat-shocked mycelia. Only the 2.8 kb transcripts are seen in vegetative mycelia and in mycelia undergoing antheridiol-induced differentiation. Two different hsp90 cDNAs were isolated and characterized. Although nearly identical, an additional eight nucleotide sequence was present at the end of the 3'UTR of one of the two cDNAs. RT-PCR analyses indicated that hsp90 transcripts containing the eight nucleotide extension, were present only in heat-shocked mycelia. Hsp90 transcripts lacking this sequence were present in vegetative mycelia and the levels of these transcripts increased in both heat-shocked and hormone-treated mycelia. Each hsp90 cDNA encoded a nearly identical Hsp90 protein. However, two Hsp90 proteins (86 and 84 kDa) were observed on immunoblots of mycelial proteins. Only one of these, i.e., the 86 kDa protein was detected by an anti-phosphoserine antibody, suggesting that the difference in mass of the two Hsp90 isoforms, was due at least in part, to different levels of phosphoserine residues.
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Affiliation(s)
- Shelley A Brunt
- Department of Medical Genetics and Microbiology and Department of Life Sciences, University of Toronto at Scarborough, Toronto, Ont., Canada M1C 1A4
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206
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Potential and Limits for the Use of New Characters in the Systematics of Biotrophic Oomycetes. ACTA ACUST UNITED AC 2004. [DOI: 10.1007/978-1-4020-2658-4_14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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207
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De Souza JT, De Boer M, De Waard P, Van Beek TA, Raaijmakers JM. Biochemical, genetic, and zoosporicidal properties of cyclic lipopeptide surfactants produced by Pseudomonas fluorescens. Appl Environ Microbiol 2003; 69:7161-72. [PMID: 14660362 PMCID: PMC309978 DOI: 10.1128/aem.69.12.7161-7172.2003] [Citation(s) in RCA: 120] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2003] [Accepted: 09/04/2003] [Indexed: 11/20/2022] Open
Abstract
Zoospores play an important role in the infection of plant and animal hosts by oomycetes and other zoosporic fungi. In this study, six fluorescent Pseudomonas isolates with zoosporicidal activities were obtained from the wheat rhizosphere. Zoospores of multiple oomycetes, including Pythium species, Albugo candida, and Phytophthora infestans, were rendered immotile within 30 s of exposure to cell suspensions or cell culture supernatants of the six isolates, and subsequent lysis occurred within 60 s. The representative strain SS101, identified as Pseudomonas fluorescens biovar II, reduced the surface tension of water from 73 to 30 mN m-1. The application of cell suspensions of strain SS101 to soil or hyacinth bulbs provided significant protection against root rot caused by Pythium intermedium. Five Tn5 mutants of strain SS101lacked the abilities to reduce the surface tension of water and to cause lysis of zoospores. Genetic characterization of two surfactant-deficient mutants showed that the transposons had integrated into condensation domains of peptide synthetases. A partially purified extract from strain SS101 reduced the surface tension of water to 30 mN m-1 and reached the critical micelle concentration at 25 micrograms ml-1. Reverse-phase high-performance liquid chromatography yielded eight different fractions, five of which had surface activity and caused lysis of zoospores. Mass spectrometry and nuclear magnetic resonance analyses allowed the identification of the main constituent as a cyclic lipopeptide (1,139 Da) containing nine amino acids and a 10-carbon hydroxy fatty acid. The other four zoosporicidal fractions were closely related to the main constituent, with molecular massesranging from 1,111 to 1,169 Da.
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Affiliation(s)
- Jorge T De Souza
- Laboratory of Phytopathology, Department of Plant Sciences, Wageningen University, 6709 PD Wageningen, The Netherlands
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208
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Huitema E, Vleeshouwers VGAA, Francis DM, Kamoun S. Active defence responses associated with non-host resistance of Arabidopsis thaliana to the oomycete pathogen Phytophthora infestans. MOLECULAR PLANT PATHOLOGY 2003; 4:487-500. [PMID: 20569408 DOI: 10.1046/j.1364-3703.2003.00195.x] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
SUMMARY The molecular basis of non-host resistance, or species-specific resistance, remains one of the major unknowns in the study of plant-microbe interactions. In this paper, we describe the characterization of a non-host pathosystem involving the model plant Arabidopsis thaliana and the economically important and destructive oomycete pathogen Phytophthora infestans. Cytological investigations into the early stages of this interaction revealed the germination of P. infestans cysts on Arabidopsis leaves, direct penetration of epidermal cells, formation of infection vesicles and occasionally secondary hyphae, followed by a typical hypersensitive response. P. infestans biomass dynamics during infection of Arabidopsis was monitored using kinetic PCR, revealing an increase in biomass during the first 24 h after inoculation, followed by a decrease in the later stages. Transgenic reporter lines and RNA blot analyses were used to characterize the defence responses induced following P. infestans infection. Significant induction of PDF1.2 was observed at 48 h after inoculation, whereas elevated levels of PR gene expression were detected three days after inoculation. To further characterize this defence response, DNA microarray analyses were carried out to determine the expression profiles for c. 11 000 Arabidopsis cDNAs 16 h after infection. These analyses revealed a significant overlap between Arabidopsis non-host response and other defence-related treatments described in the literature. In particular, non-host response to P. infestans was clearly associated with activation of the jasmonate pathway. The described Arabidopsis-P. infestans pathosystem offers excellent prospects for improving our understanding of non-host resistance.
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Affiliation(s)
- Edgar Huitema
- Department of Plant Pathology, The Ohio State University, Ohio Agricultural Research and Development Center, Wooster, Ohio 44691, USA
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209
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Vijn I, Govers F. Agrobacterium tumefaciens mediated transformation of the oomycete plant pathogen Phytophthora infestans. MOLECULAR PLANT PATHOLOGY 2003; 4:459-467. [PMID: 20569405 DOI: 10.1046/j.1364-3703.2003.00191.x] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
SUMMARY Agrobacterium tumefaciens is widely used for plant DNA transformation and, more recently, has also been used to transform yeast and filamentous fungi. Here we present a protocol for Agrobacterium-mediated DNA transformation of the oomycete Phytophthora infestans, the causal agent of potato late blight. Binary T-DNA vectors containing neomycin phosphotransferase (npt) and beta-glucuronidase (gus) fused to oomycete transcriptional regulatory sequences were constructed. Seven days of co-cultivation followed by transfer to a selective medium containing cefotaxim to kill Agrobacterium and geneticin to select for transformants, resulted in geneticin resistant colonies. Under optimal conditions with Agrobacterium supplemented with a ternary plasmid carrying a constitutive virG gene and in the presence of acetosyringone as inducer, up to 30 transformants per 10(7) zoospores could be obtained. The majority of these transformants contained a single T-DNA copy randomly integrated at a chromosomal locus. Using a similar protocol, geneticin resistant transformants of two other oomycetes species were obtained, Phytophthora palmivora and Pythium ultimum.
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Affiliation(s)
- Irma Vijn
- Laboratory of Phytopathology, Wageningen University, and Graduate School Experimental Plant Sciences, Binnenhaven 5, NL-6709 PD Wageningen, the Netherlands
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210
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Bos JIB, Armstrong M, Whisson SC, Torto TA, Ochwo M, Birch PRJ, Kamoun S. Intraspecific comparative genomics to identify avirulence genes from Phytophthora. THE NEW PHYTOLOGIST 2003; 159:63-72. [PMID: 33873680 DOI: 10.1046/j.1469-8137.2003.00801.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Members of the oomycete genus Phytophthora cause some of the most devastating plant diseases in the world and are arguably the most destructive pathogens of dicot plants. Phytophthora research has entered the genomics era. Current genomic resources include expressed sequence tags from a variety of developmental and infection stages, as well as sequences of selected regions of Phytophthora genomes. Genomics promise to impact upon our understanding of the molecular basis of infection by Phytophthora, for example, by facilitating the isolation of genes encoding effector molecules with a role in virulence and avirulence. Based on prevalent models of plant-pathogen coevolution, some of these effectors, notably those with avirulence functions, are predicted to exhibit significant sequence variation within populations of the pathogen. This and other features were used to identify candidate avirulence genes from sequence databases. Here, we describe a strategy that combines data mining with intraspecific comparative genomics and functional analyses for the identification of novel avirulence genes from Phytophthora. This approach provides a rapid and efficient alternative to classical positional cloning strategies for identifying avirulence genes that match known resistance genes. In addition, this approach has the potential to uncover 'orphan' avirulence genes for which corresponding resistance genes have not previously been characterized.
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Affiliation(s)
- Jorunn I B Bos
- Department of Plant Pathology, The Ohio State University, Ohio Agricultural Research and Development Center, Wooster, OH 44691, USA
| | - Miles Armstrong
- Plant Pathogen Interaction Programme, Scottish Crop Research Institute, Invergowrie, Dundee, DD2 5DA, UK
| | - Stephen C Whisson
- Plant Pathogen Interaction Programme, Scottish Crop Research Institute, Invergowrie, Dundee, DD2 5DA, UK
| | - Trudy A Torto
- Department of Plant Pathology, The Ohio State University, Ohio Agricultural Research and Development Center, Wooster, OH 44691, USA
| | - Mildred Ochwo
- Department of Plant Pathology, The Ohio State University, Ohio Agricultural Research and Development Center, Wooster, OH 44691, USA
| | - Paul R J Birch
- Plant Pathogen Interaction Programme, Scottish Crop Research Institute, Invergowrie, Dundee, DD2 5DA, UK
| | - Sophien Kamoun
- Department of Plant Pathology, The Ohio State University, Ohio Agricultural Research and Development Center, Wooster, OH 44691, USA
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