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  1. Article ; Online: Isolation and Characterization of Plant Metabolite Signals that Induce Type III Secretion by the Plant Pathogen Pseudomonas syringae.

    Rogan, Conner J / Anderson, Jeffrey C

    Methods in molecular biology (Clifton, N.J.)

    2019  Volume 1991, Page(s) 115–126

    Abstract: Pseudomonas syringae is a bacterium that can cause disease on a wide range of plant species including important agricultural crops. A primary virulence mechanism used by P. syringae to infect host plants is the type III secretion system (T3SS), a syringe- ...

    Abstract Pseudomonas syringae is a bacterium that can cause disease on a wide range of plant species including important agricultural crops. A primary virulence mechanism used by P. syringae to infect host plants is the type III secretion system (T3SS), a syringe-like structure that delivers defense-suppressing proteins directly into plant cells. Genes encoding the T3SS are not transcribed in P. syringae prior to contact with a potential host plant and must be expressed during initial stages of infection. Specific organic and amino acids exuded by plants were recently identified as signals that can induce expression of T3SS-associated genes. Here we describe a technique to produce exudates from intact Arabidopsis seedlings and evaluate the exudates for the presence of these bioactive metabolites. We provide procedures for exudate production as well as downstream assays to assess T3SS gene expression using a GFP transcriptional reporter. We also describe methods for preparing high-quality protein and RNA from exudate-treated bacteria to directly assess changes in mRNA and protein abundance. These methods could be used to investigate mechanisms regulating P. syringae perception of plant metabolites as well as the release of these substances by the plant, and more generally to investigate host signals perceived by other phytopathogens.
    MeSH term(s) Amino Acids/pharmacology ; Arabidopsis/growth & development ; Arabidopsis/metabolism ; Arabidopsis/microbiology ; Bacterial Proteins/drug effects ; Bacterial Proteins/metabolism ; Gene Expression Regulation, Bacterial/drug effects ; Plant Diseases/microbiology ; Pseudomonas syringae/physiology ; Type III Secretion Systems/drug effects ; Type III Secretion Systems/metabolism
    Chemical Substances Amino Acids ; Bacterial Proteins ; Type III Secretion Systems
    Language English
    Publishing date 2019-04-30
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ISSN 1940-6029
    ISSN (online) 1940-6029
    DOI 10.1007/978-1-4939-9458-8_13
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Potato Non-Specific Lipid Transfer Protein StnsLTPI.33 Is Associated with the Production of Reactive Oxygen Species, Plant Growth, and Susceptibility to

    Bvindi, Carol / Howe, Kate / Wang, You / Mullen, Robert T / Rogan, Conner J / Anderson, Jeffrey C / Goyer, Aymeric

    Plants (Basel, Switzerland)

    2023  Volume 12, Issue 17

    Abstract: Plant non-specific lipid transfer proteins (nsLTPs) are small proteins capable of transferring phospholipids between membranes and binding non-specifically fatty acids in vitro. They constitute large gene families in plants, e.g., 83 in potato ( ...

    Abstract Plant non-specific lipid transfer proteins (nsLTPs) are small proteins capable of transferring phospholipids between membranes and binding non-specifically fatty acids in vitro. They constitute large gene families in plants, e.g., 83 in potato (
    Language English
    Publishing date 2023-08-31
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2704341-1
    ISSN 2223-7747
    ISSN 2223-7747
    DOI 10.3390/plants12173129
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  3. Article: Development of a

    Yan, Qing / Rogan, Conner J / Anderson, Jeffrey C

    Molecular plant-microbe interactions : MPMI

    2019  Volume 32, Issue 5, Page(s) 527–539

    Abstract: The importance of pattern-triggered immunity (PTI) in plant defense has been clearly established through genetic studies of mutants lacking functional pattern recognition receptors (PRRs) and signaling components downstream of PRR activation. Despite ... ...

    Abstract The importance of pattern-triggered immunity (PTI) in plant defense has been clearly established through genetic studies of mutants lacking functional pattern recognition receptors (PRRs) and signaling components downstream of PRR activation. Despite extensive knowledge of PRR-mediated signaling responses to pathogen-associated molecular patterns (PAMPs), little is known about which of these responses, if any, are directly responsible for limiting bacterial growth. In this work, we established a protocol for coculturing the bacterial pathogen
    MeSH term(s) Arabidopsis/microbiology ; Arabidopsis Proteins ; Bacterial Proteins/genetics ; Bacteriological Techniques/methods ; Gene Expression Regulation, Bacterial ; Host-Pathogen Interactions/immunology ; Plant Diseases/microbiology ; Pseudomonas syringae/physiology ; Receptors, Pattern Recognition/genetics ; Type III Secretion Systems/immunology
    Chemical Substances Arabidopsis Proteins ; Bacterial Proteins ; Receptors, Pattern Recognition ; Type III Secretion Systems
    Language English
    Publishing date 2019-03-29
    Publishing country United States
    Document type Journal Article
    ZDB-ID 743331-1
    ISSN 1943-7706 ; 0894-0282
    ISSN (online) 1943-7706
    ISSN 0894-0282
    DOI 10.1094/MPMI-10-18-0295-FI
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  4. Article: Development of a Pseudomonas syringae–Arabidopsis Suspension Cell Infection System for Investigating Host Metabolite-Dependent Regulation of Type III Secretion and Pattern-Triggered Immunity

    Yan, Qing / Rogan, Conner J / Anderson, Jeffrey C

    Molecular plant-microbe interactions. 2019 May, v. 32, no. 5

    2019  

    Abstract: The importance of pattern-triggered immunity (PTI) in plant defense has been clearly established through genetic studies of mutants lacking functional pattern recognition receptors (PRRs) and signaling components downstream of PRR activation. Despite ... ...

    Abstract The importance of pattern-triggered immunity (PTI) in plant defense has been clearly established through genetic studies of mutants lacking functional pattern recognition receptors (PRRs) and signaling components downstream of PRR activation. Despite extensive knowledge of PRR-mediated signaling responses to pathogen-associated molecular patterns (PAMPs), little is known about which of these responses, if any, are directly responsible for limiting bacterial growth. In this work, we established a protocol for coculturing the bacterial pathogen Pseudomonas syringae pv. tomato DC3000 and Arabidopsis suspension cells. The system closely mirrors infection processes that occur in leaves, with bacteria relying on the type III secretion system (T3SS) for maximal growth and PAMP-induced plant defenses effectively limiting bacterial growth. To demonstrate the utility of this system, we investigated the molecular basis of PAMP-induced growth inhibition and discovered that T3SS-associated genes are inhibited when DC3000 is cocultured with PAMP-treated plant suspension cells. To determine the underlying mechanism of decreased T3SS gene expression, we performed metabolomics and biochemical analyses of suspension cell exudates and identified 14 metabolites that significantly increased or decreased following PAMP treatment. Citric acid, a known inducer of T3SS gene expression in DC3000, was among several organic acids decreased in exudates from PAMP-treated plant cells. Exogenous addition of citric acid increased T3SS gene expression and partially recovered growth of DC3000 in the presence of PAMP-treated cells, indicating that a portion of PAMP-induced defense in this system is decreased extracellular release of this metabolite. We envision that the well-defined infection conditions of this coculture system will be valuable for quantitative studies of type III effector delivery by P. syringae. Furthermore, this system provides a unique ‘top-down’ approach to unravel the molecular basis of PTI against P. syringae.
    Keywords Arabidopsis ; Pseudomonas syringae pv. tomato ; bacteria ; bacterial growth ; citric acid ; coculture ; gene expression ; genes ; growth retardation ; immunity ; leaves ; metabolites ; metabolomics ; mutants ; pathogen-associated molecular patterns ; pathogens ; receptors ; type III secretion system
    Language English
    Dates of publication 2019-05
    Size p. 527-539.
    Publishing place Molecular Plant-Microbe Interactions
    Document type Article
    ZDB-ID 743331-1
    ISSN 1943-7706 ; 0894-0282
    ISSN (online) 1943-7706
    ISSN 0894-0282
    DOI 10.1094/MPMI-10-18-0295-FI
    Database NAL-Catalogue (AGRICOLA)

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  5. Article ; Online: Ancient co-option of an amino acid ABC transporter locus in Pseudomonas syringae for host signal-dependent virulence gene regulation.

    Yan, Qing / Rogan, Conner J / Pang, Yin-Yuin / Davis, Edward W / Anderson, Jeffrey C

    PLoS pathogens

    2020  Volume 16, Issue 7, Page(s) e1008680

    Abstract: Pathogenic bacteria frequently acquire virulence traits via horizontal gene transfer, yet additional evolutionary innovations may be necessary to integrate newly acquired genes into existing regulatory pathways. The plant bacterial pathogen Pseudomonas ... ...

    Abstract Pathogenic bacteria frequently acquire virulence traits via horizontal gene transfer, yet additional evolutionary innovations may be necessary to integrate newly acquired genes into existing regulatory pathways. The plant bacterial pathogen Pseudomonas syringae relies on a horizontally acquired type III secretion system (T3SS) to cause disease. T3SS-encoding genes are induced by plant-derived metabolites, yet how this regulation occurs, and how it evolved, is poorly understood. Here we report that the two-component system AauS-AauR and substrate-binding protein AatJ, proteins encoded by an acidic amino acid-transport (aat) and -utilization (aau) locus in P. syringae, directly regulate T3SS-encoding genes in response to host aspartate and glutamate signals. Mutants of P. syringae strain DC3000 lacking aauS, aauR or aatJ expressed lower levels of T3SS genes in response to aspartate and glutamate, and had decreased T3SS deployment and virulence during infection of Arabidopsis. We identified an AauR-binding motif (Rbm) upstream of genes encoding T3SS regulators HrpR and HrpS, and demonstrated that this Rbm is required for maximal T3SS deployment and virulence of DC3000. The Rbm upstream of hrpRS is conserved in all P. syringae strains with a canonical T3SS, suggesting AauR regulation of hrpRS is ancient. Consistent with a model of conserved function, an aauR deletion mutant of P. syringae strain B728a, a bean pathogen, had decreased T3SS expression and growth in host plants. Together, our data suggest that, upon acquisition of T3SS-encoding genes, a strain ancestral to P. syringae co-opted an existing AatJ-AauS-AauR pathway to regulate T3SS deployment in response to specific host metabolite signals.
    MeSH term(s) Arabidopsis/microbiology ; Gene Expression Regulation, Bacterial/physiology ; Plant Diseases/microbiology ; Pseudomonas syringae/pathogenicity ; Type III Secretion Systems/physiology ; Virulence/physiology
    Chemical Substances Type III Secretion Systems
    Language English
    Publishing date 2020-07-16
    Publishing country United States
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 2205412-1
    ISSN 1553-7374 ; 1553-7374
    ISSN (online) 1553-7374
    ISSN 1553-7374
    DOI 10.1371/journal.ppat.1008680
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Opposing functions of the plant TOPLESS gene family during SNC1-mediated autoimmunity.

    Garner, Christopher M / Spears, Benjamin J / Su, Jianbin / Cseke, Leland J / Smith, Samantha N / Rogan, Conner J / Gassmann, Walter

    PLoS genetics

    2021  Volume 17, Issue 2, Page(s) e1009026

    Abstract: Regulation of the plant immune system is important for controlling the specificity and amplitude of responses to pathogens and in preventing growth-inhibiting autoimmunity that leads to reductions in plant fitness. In previous work, we reported that ... ...

    Abstract Regulation of the plant immune system is important for controlling the specificity and amplitude of responses to pathogens and in preventing growth-inhibiting autoimmunity that leads to reductions in plant fitness. In previous work, we reported that SRFR1, a negative regulator of effector-triggered immunity, interacts with SNC1 and EDS1. When SRFR1 is non-functional in the Arabidopsis accession Col-0, SNC1 levels increase, causing a cascade of events that lead to autoimmunity phenotypes. Previous work showed that some members of the transcriptional co-repressor family TOPLESS interact with SNC1 to repress negative regulators of immunity. Therefore, to explore potential connections between SRFR1 and TOPLESS family members, we took a genetic approach that examined the effect of each TOPLESS member in the srfr1 mutant background. The data indicated that an additive genetic interaction exists between SRFR1 and two members of the TOPLESS family, TPR2 and TPR3, as demonstrated by increased stunting and elevated PR2 expression in srfr1 tpr2 and srfr1 tpr2 tpr3 mutants. Furthermore, the tpr2 mutation intensifies autoimmunity in the auto-active snc1-1 mutant, indicating a novel role of these TOPLESS family members in negatively regulating SNC1-dependent phenotypes. This negative regulation can also be reversed by overexpressing TPR2 in the srfr1 tpr2 background. Similar to TPR1 that positively regulates snc1-1 phenotypes by interacting with SNC1, we show here that TPR2 directly binds the N-terminal domain of SNC1. In addition, TPR2 interacts with TPR1 in vivo, suggesting that the opposite functions of TPR2 and TPR1 are based on titration of SNC1-TPR1 complexes by TPR2 or altered functions of a SNC1-TPR1-TPR2 complex. Thus, this work uncovers diverse functions of individual members of the TOPLESS family in Arabidopsis and provides evidence for the additive effect of transcriptional and post-transcriptional regulation of SNC1.
    MeSH term(s) Arabidopsis/genetics ; Arabidopsis/immunology ; Arabidopsis/metabolism ; Arabidopsis Proteins/genetics ; Arabidopsis Proteins/metabolism ; Autoimmunity/genetics ; Gene Expression Regulation, Plant/genetics ; Gene Expression Regulation, Plant/immunology ; Molecular Chaperones/genetics ; Molecular Chaperones/metabolism ; Mutation ; Plant Immunity/genetics ; Plants, Genetically Modified ; Up-Regulation
    Chemical Substances AT1G04130 protein, Arabidopsis ; Arabidopsis Proteins ; Molecular Chaperones ; SNC1 protein, Arabidopsis ; SRFR1 protein, Arabidopsis ; topless protein, Arabidopsis ; topless-related 1 protein, Arabidopsis
    Language English
    Publishing date 2021-02-23
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 2186725-2
    ISSN 1553-7404 ; 1553-7390
    ISSN (online) 1553-7404
    ISSN 1553-7390
    DOI 10.1371/journal.pgen.1009026
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  7. Article ; Online: Chronic blue light leads to accelerated aging in Drosophila by impairing energy metabolism and neurotransmitter levels.

    Yang, Jun / Song, Yujuan / Law, Alexander D / Rogan, Conner J / Shimoda, Kelsey / Djukovic, Danijel / Anderson, Jeffrey C / Kretzschmar, Doris / Hendrix, David A / Giebultowicz, Jadwiga M

    Frontiers in aging

    2022  Volume 3, Page(s) 983373

    Abstract: Blue light (BL) is becoming increasingly prevalent in artificial illumination, raising concerns about its potential health hazard to humans. In fact, there is evidence suggesting that acute BL exposure may lead to oxidative stress and death of retinal ... ...

    Abstract Blue light (BL) is becoming increasingly prevalent in artificial illumination, raising concerns about its potential health hazard to humans. In fact, there is evidence suggesting that acute BL exposure may lead to oxidative stress and death of retinal cells specialized for photoreception. On the other hand, recent studies in
    Language English
    Publishing date 2022-08-31
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 3076785-4
    ISSN 2673-6217 ; 2673-6217
    ISSN (online) 2673-6217
    ISSN 2673-6217
    DOI 10.3389/fragi.2022.983373
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  8. Article ; Online: StPIP1, a PAMP-induced peptide in potato, elicits plant defenses and is associated with disease symptom severity in a compatible interaction with Potato virus Y.

    Combest, Max M / Moroz, Natalia / Tanaka, Kiwamu / Rogan, Conner J / Anderson, Jeffrey C / Thura, Lin / Rakotondrafara, Aurélie M / Goyer, Aymeric

    Journal of experimental botany

    2020  Volume 72, Issue 12, Page(s) 4472–4488

    Abstract: The role of small secreted peptides in plant defense responses to viruses has seldom been investigated. Here, we report a role for potato (Solanum tuberosum) PIP1, a gene predicted to encode a member of the pathogen-associated molecular pattern (PAMP)- ... ...

    Abstract The role of small secreted peptides in plant defense responses to viruses has seldom been investigated. Here, we report a role for potato (Solanum tuberosum) PIP1, a gene predicted to encode a member of the pathogen-associated molecular pattern (PAMP)-induced peptide (PIP) family, in the response of potato to Potato virus Y (PVY) infection. We show that exogenous application of synthetic StPIP1 to potato leaves and nodes increased the production of reactive oxygen species and the expression of plant defense-related genes, revealing that StPIP1 triggers early defense responses. In support of this hypothesis, transgenic potato plants that constitutively overexpress StPIP1 had higher levels of leaf callose deposition and, based on measurements of viral RNA titers, were less susceptible to infection by a compatible PVY strain. Interestingly, systemic infection of StPIP1-overexpressing lines with PVY resulted in clear rugose mosaic symptoms that were absent or very mild in infected non-transgenic plants. A transcriptomics analysis revealed that marker genes associated with both pattern-triggered immunity and effector-triggered immunity were induced in infected StPIP1 overexpressors but not in non-transgenic plants. Together, our results reveal a role for StPIP1 in eliciting plant defense responses and in regulating plant antiviral immunity.
    Language English
    Publishing date 2020-12-06
    Publishing country England
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 2976-2
    ISSN 1460-2431 ; 0022-0957
    ISSN (online) 1460-2431
    ISSN 0022-0957
    DOI 10.1093/jxb/erab078
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  9. Article ; Online: Pathogen-induced AdDjSKI of the wild peanut, Arachis diogoi, potentiates tolerance of multiple stresses in E. coli and tobacco.

    Rampuria, Sakshi / Bag, Pushan / Rogan, Conner J / Sharma, Akanksha / Gassmann, Walter / Kirti, P B

    Plant science : an international journal of experimental plant biology

    2018  Volume 272, Page(s) 62–74

    Abstract: A gene encoding a serine-rich DnaJIII protein called AdDjSKI that has a 4Fe-4S cluster domain was found to be differentially upregulated in the wild peanut, Arachis diogoi in its resistance responses against the late leaf spot causing fungal pathogen ... ...

    Abstract A gene encoding a serine-rich DnaJIII protein called AdDjSKI that has a 4Fe-4S cluster domain was found to be differentially upregulated in the wild peanut, Arachis diogoi in its resistance responses against the late leaf spot causing fungal pathogen Phaeoisariopsis personata when compared with the cultivated peanut, Arachis hypogaea. AdDjSKI is induced in multiple stress conditions in A. diogoi. Recombinant E. coli cells expressing AdDjSKI showed better growth kinetics when compared with vector control cells under salinity, osmotic, acidic and alkaline stress conditions. Overexpression of this type three J-protein potentiates not only abiotic stress tolerance in Nicotiana tabacum var. Samsun, but also enhances its disease resistance against the phytopathogenic fungi Phytophthora parasitica pv nicotianae and Sclerotinia sclerotiorum. In the present study we show transcriptional upregulation of APX, Mn-SOD and HSP70 under heat stress and increased transcripts of PR genes in response to fungal infection. This transmembrane-domain-containing J protein displays punctate localization in chloroplasts. AdDjSKI appears to ensure proper folding of proteins associated with the photosynthetic machinery under stress.
    MeSH term(s) Arachis/genetics ; Arachis/physiology ; Disease Resistance/genetics ; Disease Resistance/physiology ; Escherichia coli/genetics ; Escherichia coli/physiology ; Organisms, Genetically Modified ; Osmotic Pressure/physiology ; Plant Proteins/genetics ; Plant Proteins/physiology ; Plants, Genetically Modified ; RNA, Plant/genetics ; Real-Time Polymerase Chain Reaction ; Salt Tolerance/genetics ; Salt Tolerance/physiology ; Stress, Physiological/genetics ; Stress, Physiological/physiology ; Nicotiana/genetics ; Nicotiana/physiology
    Chemical Substances Plant Proteins ; RNA, Plant
    Language English
    Publishing date 2018-04-03
    Publishing country Ireland
    Document type Journal Article
    ZDB-ID 742010-9
    ISSN 1873-2259 ; 0168-9452
    ISSN (online) 1873-2259
    ISSN 0168-9452
    DOI 10.1016/j.plantsci.2018.03.033
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  10. Article ; Online: Arabidopsis

    Kamiyama, Yoshiaki / Hirotani, Misaki / Ishikawa, Shinnosuke / Minegishi, Fuko / Katagiri, Sotaro / Rogan, Conner J / Takahashi, Fuminori / Nomoto, Mika / Ishikawa, Kazuya / Kodama, Yutaka / Tada, Yasuomi / Takezawa, Daisuke / Anderson, Jeffrey C / Peck, Scott C / Shinozaki, Kazuo / Umezawa, Taishi

    Proceedings of the National Academy of Sciences of the United States of America

    2021  Volume 118, Issue 30

    Abstract: The phytohormone abscisic acid (ABA) plays a major role in abiotic stress responses in plants, and subclass III SNF1-related protein kinase 2 (SnRK2) kinases mediate ABA signaling. In this study, we identified Raf36, a group C Raf-like protein kinase ... ...

    Abstract The phytohormone abscisic acid (ABA) plays a major role in abiotic stress responses in plants, and subclass III SNF1-related protein kinase 2 (SnRK2) kinases mediate ABA signaling. In this study, we identified Raf36, a group C Raf-like protein kinase in
    MeSH term(s) Abscisic Acid/pharmacology ; Arabidopsis/genetics ; Arabidopsis/growth & development ; Arabidopsis/metabolism ; Arabidopsis Proteins/genetics ; Arabidopsis Proteins/metabolism ; Gene Expression Regulation, Plant/drug effects ; Phosphorylation ; Plant Growth Regulators/pharmacology ; Protein Serine-Threonine Kinases/genetics ; Protein Serine-Threonine Kinases/metabolism ; Signal Transduction ; Stress, Physiological
    Chemical Substances Arabidopsis Proteins ; Plant Growth Regulators ; SnRK2 protein, Arabidopsis ; Abscisic Acid (72S9A8J5GW) ; Protein Serine-Threonine Kinases (EC 2.7.11.1)
    Language English
    Publishing date 2021-06-18
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.2100073118
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