研究者詳細 - 一瀬　勇規

HopAZ1, a type III effector of Pseudomonas amygdali pv. tabaci , induces a hypersensitive response in tobacco wildfire‐resistant Nicotiana tabacum ‘N509’

その他リンク： https://link.springer.com/article/10.1007/s10327-023-01126-4/fulltext.html

Requirement of chemotaxis and aerotaxis in host tobacco infection by Pseudomonas syringae pv. tabaci 6605 査読

Yuki Ichinose, Yuta Watanabe, Stephany Angelia Tumewu, Hidenori Matsui, Mikihiro Yamamoto, Yoshiteru Noutoshi, Kazuhiro Toyoda

Physiological and Molecular Plant Pathology 124 101970 - 101970 2023年3月

HopAZ1, a type-III effector of Pseudomonas amygdali pv. tabaci, induces a hypersensitive response in tobacco wildfire-resistant Nicotiana tabacum cv. N509. 査読

Kashihara, S., Nishimura, T., Noutoshi, Y., Yamamoto, M., Toyoda, K., Ichinose, Y. and Matsui, H.

Mol. Plant Pathol. 23 ( 6 ) 885 - 894 2022年6月

Sachi Kashihara, Takafumi Nishimura, Yoshiteru Noutoshi, Mikihiro Yamamoto, Kazuhiro Toyoda, Yuki Ichinose, Hidenori Matsui

Molecular Plant Pathology 23 ( 6 ) 885 - 894 2022年6月

Identification of aerotaxis receptor proteins involved in host plant infection by Pseudomonas syringae pv. tabaci 6605. 査読

Tumewu, S. A., F., Matsui, H., Yamamoto, M., Noutoshi, Y., Toyoda, K., Ichinose, Y.

Microbes and Environments 37 ME21076 2022年2月

Identification of Aerotaxis Receptor Proteins Involved in Host Plant Infection by Pseudomonas syringae pv. tabaci 6605.

Stephany Angelia Tumewu, Yuta Watanabe, Hidenori Matsui, Mikihiro Yamamoto, Yoshiteru Noutoshi, Kazuhiro Toyoda, Yuki Ichinose

Microbes and environments 37 ( 1 ) 2022年

記述言語：英語掲載種別：研究論文（学術雑誌）

Pseudomonas syringae pv. tabaci 6605 (Pta6605) is a foliar plant pathogen that causes wildfire disease on tobacco plants. It requires chemotaxis to enter plants and establish infection. While chemotactic signals appear to be the main mechanism by which Pta6605 performs directional movement, the involvement of aerotaxis or energy taxis by this foliar pathogen is currently unknown. Based on domain structures and similarity with more than 50 previously identified putative methyl-accepting chemotaxis proteins (MCPs), the genome of Pta6605 encodes three potential aerotaxis transducers. We identified AerA as the main aerotaxis transducer and found that it possesses a taxis-to-serine-and-repellent (Tsr)-like domain structure that supports a periplasmic 4HB-type ligand-binding domain (LBD). The secondary aerotaxis transducer, AerB, possesses a cytosolic PAS-type LBD, similar to the Aer of Escherichia coli and Pseudomonas aeruginosa. Aerotaxis ability by single and double mutant strains of aerA and aerB was weaker than that by wild-type Pta6605. On the other hand, another cytosolic PAS-type LBD containing MCP did not make a major contribution to Pta6605 aerotaxis in our assay system. Furthermore, mutations in aerotaxis transducer genes did not affect surface motility or chemotactic attraction to yeast extract. Single and double mutant strains of aerA and aerB showed less colonization in the early stage of host plant infection and lower biofilm production than wild-type Pta6605. These results demonstrate the presence of aerotaxis transducers and their contribution to host plant infection by Pta6605.

DOI： 10.1264/jsme2.ME21076

Role of trehalose synthesis in Ralstonia syzygii subsp. indonesiensis PW1001 in inducing hypersensitive response on eggplant (Solanum melongena cv. Senryo-nigou) 査読

Ralstonia solanacearum type III effector RipAC targets SGT1 to suppress effector-triggered immunity. 招待

Nakano, M., Ichinose, Y., Mukaihara, T.

Plant Cell Physiol. 61 ( 12 ) 2067 - 2076 2021年12月

37 ( 6 ) 566 - 579 2021年12月

Identification of chemoreceptor proteins for amino acids involved in host plant infection in Pseudomonas syringae pv. tabaci 6605 査読

Stephany Angelia Tumewu, Hidenori Matsui, Mikihiro Yamamoto, Yoshiteru Noutoshi, Kazuhiro Toyoda, Yuki Ichinose

Microbiological Research 253 126869 - 126869 2021年12月

Identification of chemoreceptor proteins for amino acids involved in host plant infection in Pseudomonas syringae pv. tabaci 6605. 査読

Microbiol. Res. 253 126869 2021年8月

Complete Genome Sequence of Pseudomonas amygdali pv. tabaci Strain 6605, a Causal Agent of Tobacco Wildfire Disease 査読

Hidenori Matsui, Takafumi Nishimura, Shuta Asai, Sachiko Masuda, Ken Shirasu, Mikihiro Yamamoto, Yoshiteru Noutoshi, Kazuhiro Toyoda, Yuki Ichinose

MICROBIOLOGY RESOURCE ANNOUNCEMENTS 10 ( 28 ) 2021年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER SOC MICROBIOLOGY

Pseudomonas amygdali pv. tabaci strain 6605 is the bacterial pathogen causing tobacco wildfire disease that has been used as a model for elucidating virulence mechanisms. Here, we present the complete genome sequence of P. amygdali pv. tabaci 6605 as a circular chromosome from reads using a PacBio sequencer.

DOI： 10.1128/MRA.00405-21

Cluster II che genes of Pseudomonas syringae pv. tabaci 6605, orthologs of cluster I in Pseudomonas aeruginosa, are required for chemotaxis and virulence 査読

Vfr targets promoter of genes encoding methyl-accepting chemotaxis protein in Pseudomonas syringae pv. tabaci 6605 査読

Keisuke Ogura, Hidenori Matsui, Mikihiro Yamamoto, Yoshiteru Noutoshi, Kazuhiro Toyoda, Fumiko Taguchi, Yuki Ichinose

Biochemistry and Biophysics Reports 26 100944 - 100944 2021年7月

Stephany Angelia Tumewu, Yujiro Ogawa, Takumi Okamoto, Yuka Sugihara, Hajime Yamada, Fumiko Taguchi, Hidenori Matsui, Mikihiro Yamamoto, Yoshiteru Noutoshi, Kazuhiro Toyoda, Yuki Ichinose

Molecular Genetics and Genomics 2021年1月

HopH1 effectors of Pseudomonas syringae pv. tomato DC3000 and pv. syringae B728a induce HR cell death in nonhost eggplant Solanum torvum 査読

Kamrun Nahar, Takafumi Mukaihara, Fumiko Taguchi, Hidenori Matsui, Mikihiro Yamamoto, Kazuhiro Toyoda, Yoshiteru Noutoshi, Tomonori Shiraishi, Yuki Ichinose

Journal of General Plant Pathology 87 ( 1 ) 24 - 29 2021年1月

Role of Two Sets of RND-Type Multidrug Efflux Pump Transporter Genes, mexAB-oprM and mexEF-oprN, in Virulence of Pseudomonas syringae pv. tabaci 6605 査読

Yuki Ichinose, Takafumi Nishimura, Minori Harada, Ryota Kashiwagi, Mikihiro Yamamoto, Yoshiteru Noutoshi, Kazuhiro Toyoda, Fumiko Taguchi, Daigo Takemoto, Hidenori Matsui

PLANT PATHOLOGY JOURNAL 36 ( 2 ) 148 - 156 2020年4月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：KOREAN SOC PLANT PATHOLOGY

Pseudomonas syringae pv. tabaci 6605 has two multidrug resistance (MDR) efflux pump transporters, MexAB-OprM and MexEF-OprN. To understand the role of these MDR efflux pumps in virulence, we generated deletion mutants, Delta mexB, Delta mexF, and Delta mexB Delta mexF, and investigated their sensitivity to plant-derived antimicrobial compounds, antibiotics, and virulence. Growth inhibition assays with KB soft agar plate showed that growth of the wild-type (WT) was inhibited by 5 mu l of 1 M catechol and 1 M coumarin but not by other plant-derived potential antimicrobial compounds tested including phytoalexins. The sensitivity to these compounds tended to increase in Delta mexB and Delta mexB Delta mexF mutants. The Delta mexB Delta mexF mutant was also sensitive to 2 M acetovanillone. The mexAB-oprM was constitutively expressed, and activated in the Delta mexF and Delta mexB Delta mexF mutant strains. The swarming and swimming motilities were impaired in Delta mexF and Delta mexB Delta rnexF mutants. The flood inoculation test indicated that bacterial populations in all mutant strains were significantly lower than that of WT, although all mutants and WT caused similar disease symptoms. These results indicate that MexAB-OprM extrudes plant-derived catechol, acetovanillone, or coumarin, and contributes to bacterial virulence. Furthermore, MexAB-OprM and MexEF-OprN complemented each other's functions to some extent.

DOI： 10.5423/PPJ.OA.11.2019.0273

PsyR, a transcriptional regulator in quorum sensing system, binds lux box-like sequence in psyI promoter without AHL quorum sensing molecule and activates psyI transcription with AHL in Pseudomonas syringae pv. tabaci 6605 査読

Yuki Ichinose, Yousuke Tasaka, Satoru Yamamoto, Yuko Inoue, Motohiro Takata, Yukiko Nakatsu, Fumiko Taguchi, Mikihiro Yamamoto, Kazuhiro Toyoda, Yoshiteru Noutoshi, Hidenori Matsui

JOURNAL OF GENERAL PLANT PATHOLOGY 86 ( 2 ) 124 - 133 2020年3月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SPRINGER JAPAN KK

Quorum sensing (QS) is a mechanism for bacterial cell-cell communication using QS signals. N-acyl-homoserine lactones (AHLs), QS signals in Pseudomonas syringae pv. tabaci (Pta) 6605, are synthesized by an AHL synthase (PsyI) and recognized by the cognate transcription factor PsyR. To reveal the role of PsyR in virulence, we generated a psyR mutant and complemented strains of Pta 6605 and found that the psyR mutant is remarkably reduced in AHL production and ability to cause disease and propagate in host tobacco leaves. The phenotypes of complemented strains were restored to that of the wild type (WT). Because the psyR mutant lost nearly all AHL production, we investigated the function of PsyR in the transcription of psyI and production of AHL. Electrophoretic mobility shift assays suggested that the recombinant PsyR protein binds the promoter region of psyI but not psyR without AHL. The addition of AHL did not significantly affect this binding. The binding core sequence of this region was identified as a 20-bp lux box-like sequence. To reveal the function of PsyR and AHL on psyI transcription, we constructed a psyI promoter::lacZYA chimeric reporter gene, and inserted it into the WT and psyI mutant of Pta 6605. beta-galactosidase activity increased in a bacterial density-dependent manner in the WT and also in a psyI mutant after the addition of exogenous AHL. These results indicate that the solo PsyR binds the lux box in the psyI promoter and activates transcription in the concomitant presence of AHL.

DOI： 10.1007/s10327-019-00893-3

Requirement of γ-Aminobutyric Acid Chemotaxis for Virulence of Pseudomonas syringae pv. tabaci 6605. 査読

Stephany Angelia Tumewu, Hidenori Matsui, Mikihiro Yamamoto, Yoshiteru Noutoshi, Kazuhiro Toyoda, Yuki Ichinose

Microbes and environments 35 ( 4 ) 2020年

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

γ-Aminobutyric acid (GABA) is a widely distributed non-proteinogenic amino acid that accumulates in plants under biotic and abiotic stress conditions. Recent studies suggested that GABA also functions as an intracellular signaling molecule in plants and in signals mediating interactions between plants and phytopathogenic bacteria. However, the molecular mechanisms underlying GABA responses to bacterial pathogens remain unknown. In the present study, a GABA receptor, named McpG, was conserved in the highly motile plant-pathogenic bacteria Pseudomonas syringae pv. tabaci 6605 (Pta6605). We generated a deletion mutant of McpG to further investigate its involvement in GABA chemotaxis using quantitative capillary and qualitative plate assays. The wild-type strain of Pta6605 was attracted to GABA, while the ΔmcpG mutant abolished chemotaxis to 10‍ ‍mM GABA. However, ΔmcpG retained chemotaxis to proteinogenic amino acids and succinic semialdehyde, a structural analog of GABA. Furthermore, ΔmcpG was unable to effectively induce disease on host tobacco plants in three plant inoculation assays: flood, dip, and infiltration inoculations. These results revealed that the GABA sensing of Pta6605 is important for the interaction of Pta6605 with its host tobacco plant.

DOI： 10.1264/jsme2.ME20114

A class III peroxidase PRX34 is a component of disease resistance in Arabidopsis 査読

Lei Zhao, Le Thi Phuong, Mai Thanh Luan, Aprilia Nur Fitrianti, Hidenori Matsui, Hirofumi Nakagami, Yoshiteru Noutoshi, Mikihiro Yamamoto, Yuki Ichinose, Tomonori Shiraishi, Kazuhiro Toyoda

JOURNAL OF GENERAL PLANT PATHOLOGY 85 ( 6 ) 405 - 412 2019年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SPRINGER JAPAN KK

PRX34 mediates the oxidative burst in Arabidopsis. Here we characterized two additional Arabidopsis prx34 null mutants (prx34-2, prx34-3), besides the well-studied prx34-1. Due to a decrease in corresponding peroxidase, the activity that generates reactive oxygen species (ROS) was significantly lower in cell wall extracts of prx34-2 and prx34-3 plants. Consistently, the prx34-2 and prx34-3 exhibited reduced accumulation both of ROS and callose in Flg22-elicitor-treated leaves, leading to enhanced susceptibility to bacterial and fungal pathogens. In contrast, ectopic expression of PRX34 in the wild type caused enhanced resistance. PRX34 is thus a component for disease resistance in Arabidopsis.

DOI： 10.1007/s10327-019-00863-9

Glycosidase and glycan polymorphism control hydrolytic release of immunogenic flagellin peptides 査読国際誌

Pierre Buscaill, Balakumaran Chandrasekar, Nattapong Sanguankiattichai, Jiorgos Kourelis, Farnusch Kaschani, Emma L. Thomas, Kyoko Morimoto, Markus Kaiser, Gail M. Preston, Yuki Ichinose, Renier A. L. van der Hoorn

Science 364 ( 6436 ) 2019年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：American Association for the Advancement of Science (AAAS)

Plants and animals recognize conserved flagellin fragments as a signature of bacterial invasion. These immunogenic elicitor peptides are embedded in the flagellin polymer and require hydrolytic release before they can activate cell surface receptors. Although much of flagellin signaling is understood, little is known about the release of immunogenic fragments. We discovered that plant-secreted β-galactosidase 1 (BGAL1) of Nicotiana benthamiana promotes hydrolytic elicitor release and acts in immunity against pathogenic Pseudomonas syringae strains only when they carry a terminal modified viosamine (mVio) in the flagellin O-glycan. In counter defense, P. syringae pathovars evade host immunity by using BGAL1-resistant O-glycans or by producing a BGAL1 inhibitor. Polymorphic glycans on flagella are common to plant and animal pathogenic bacteria and represent an important determinant of host immunity to bacterial pathogens.

DOI： 10.1126/science.aav0748

Loliolide, a Carotenoid Metabolite, Is a Potential Endogenous Inducer of Herbivore Resistance. 査読国際誌

Mika Murata, Yusuke Nakai, Kei Kawazu, Masumi Ishizaka, Hideyuki Kajiwara, Hiroshi Abe, Kasumi Takeuchi, Yuki Ichinose, Ichiro Mitsuhara, Atsushi Mochizuki, Shigemi Seo

Plant physiology 179 ( 4 ) 1822 - 1833 2019年4月

記述言語：英語掲載種別：研究論文（学術雑誌）

Jasmonic acid (JA) plays an important role in the induction of herbivore resistance in many plants. However, JA-independent herbivore resistance has been suggested. An herbivore-resistance-inducing substance was isolated from Tobacco mosaic virus-infected tobacco (Nicotiana tabacum) leaves in which a hypersensitive response (HR) was induced and identified as loliolide, which has been identified as a β-carotene metabolite. When applied to tomato (Solanum lycopersicum) leaves, loliolide decreased the survival rate of the two-spotted spider mite, Tetranychus urticae, egg deposition by the same pest, and the survival rate of larvae of the common cutworm Spodoptera litura without exhibiting toxicity against these herbivores. Endogenous loliolide levels increased not only with an infestation by Slitura larvae, but also with the exogenous application of their oral secretions in tomato. A microarray analysis identified cell-wall-associated defense genes as loliolide-responsive tomato genes, and exogenous JA application did not induce the expression of these genes. Suppressor of zeaxanthin-less (szl), an Arabidopsis (Arabidopsis thaliana) mutant with a point mutation in a key gene of the β-carotene metabolic pathway, exhibited the decreased accumulation of endogenous loliolide and increased susceptibility to infestation by the western flower thrip (Frankliniella occidentalis). A pretreatment with loliolide decreased susceptibility to thrips in the JA-insensitive Arabidopsis mutant coronatine-insensitive1 Exogenous loliolide did not restore reduced electrolyte leakage in szl in response to a HR-inducing bacterial strain. These results suggest that loliolide functions as an endogenous signal that mediates defense responses to herbivores, possibly independently of JA, at least in tomato and Arabidopsis plants.

DOI： 10.1104/pp.18.00837